diff --git a/CMakeLists.txt b/CMakeLists.txt
index 090c8233836ad3908e7d327a8149f51a9b19059b..30ca68bb384bde8acd891875a986b91afdb68e4b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -58,7 +58,6 @@ add_subdirectory(include)
 add_subdirectory(doc)
 
 add_library(caosdb STATIC ${libcaosdb_INCL} ${libcaosdb_SRC})
-add_executable(caosdbcli src/caosdbcli.cpp)
 
 #######################################################
 ### LINTING with CLANG-TIDY and INCLUDE-WHAT-YOU-USE
@@ -103,10 +102,6 @@ if(_LINTING)
         CXX_CLANG_TIDY "${_CMAKE_CXX_CLANG_TIDY};${_CMAKE_CXX_CLANG_TIDY_CHECKS}"
         CXX_INCLUDE_WHAT_YOU_USE "${_CMAKE_CXX_INCLUDE_WHAT_YOU_USE}"
         )
-    set_target_properties(caosdbcli PROPERTIES
-        CXX_CLANG_TIDY "${_CMAKE_CXX_CLANG_TIDY};${_CMAKE_CXX_CLANG_TIDY_CHECKS}"
-        CXX_INCLUDE_WHAT_YOU_USE "${_CMAKE_CXX_INCLUDE_WHAT_YOU_USE}"
-        )
 endif()
 
 
@@ -119,69 +114,7 @@ if("${CMAKE_BUILD_TYPE}" MATCHES "Debug")
     add_subdirectory(test)
 endif()
 
-####################################################################
-### CODE GENERATION (WITH GRPC)
-####################################################################
-
-# Protobuf/Grpc source files
-set(PROTO_FILES
-    ${PROJECT_SOURCE_DIR}/proto/proto/caosdb/info/v1alpha1/main.proto
-)
-
-set(PROTO_PATH ${PROJECT_SOURCE_DIR}/proto/proto)
-
-# compiler binaries
-set(_PROTOBUF_PROTOC "${CMAKE_BINARY_DIR}/build_tools/protoc")
-set(_GRPC_CPP_PLUGIN_EXECUTABLE "${CMAKE_BINARY_DIR}/build_tools/grpc_cpp_plugin")
-
-# Generated sources
-set(hw_hdrs_path "info/v1alpha1")
-set(hw_proto_srcs "${CMAKE_CURRENT_BINARY_DIR}/include/caosdb/${hw_hdrs_path}/main.pb.cc")
-set(hw_proto_hdrs "${CMAKE_CURRENT_BINARY_DIR}/include/caosdb/${hw_hdrs_path}/main.pb.h")
-set(hw_grpc_srcs "${CMAKE_CURRENT_BINARY_DIR}/include/caosdb/${hw_hdrs_path}/main.grpc.pb.cc")
-set(hw_grpc_hdrs "${CMAKE_CURRENT_BINARY_DIR}/include/caosdb/${hw_hdrs_path}/main.grpc.pb.h")
-
-# compile *proto files to cpp
-set(GRPC_GENERATED_HEADERS
-    "${hw_proto_hdrs}"
-    "${hw_grpc_hdrs}")
-set(GRPC_GENERATED_SOURCES
-    "${hw_proto_srcs}"
-    "${hw_grpc_srcs}")
-set(GRPC_GENERATED
-    ${GRPC_GENERATED_SOURCES}
-    ${GRPC_GENERATED_HEADERS})
-add_custom_command(
-      OUTPUT ${GRPC_GENERATED}
-      COMMAND ${_PROTOBUF_PROTOC}
-      ARGS --grpc_out "${CMAKE_CURRENT_BINARY_DIR}/include"
-        --cpp_out "${CMAKE_CURRENT_BINARY_DIR}/include"
-        -I "${PROTO_PATH}"
-        --plugin=protoc-gen-grpc="${_GRPC_CPP_PLUGIN_EXECUTABLE}"
-        "${PROTO_FILES}"
-      DEPENDS "${PROTO_FILES}")
-
-
-# hw_grpc_proto
-add_library(caosdb_info_v1alpha1
-    ${GRPC_GENERATED})
-target_link_libraries(caosdb_info_v1alpha1
-  ${CONAN_LIBS})
-target_include_directories(caosdb_info_v1alpha1 PUBLIC
-   # headers to include when building from source
-   ${CONAN_INCLUDE_DIRS}
-   $<BUILD_INTERFACE:${libcaosdb_SOURCE_DIR}/include>
-   $<BUILD_INTERFACE:${libcaosdb_BINARY_DIR}/include>
-   $<INSTALL_INTERFACE:include>
-   )
-
 target_link_libraries(caosdb
-  caosdb_info_v1alpha1
-  ${CONAN_LIBS}
-)
-target_link_libraries(caosdbcli
-  caosdb
-  caosdb_info_v1alpha1
   ${CONAN_LIBS}
 )
 
@@ -217,12 +150,6 @@ target_include_directories(caosdb PUBLIC
    $<INSTALL_INTERFACE:include>
    )
 
-target_include_directories(caosdbcli PUBLIC
-   ${libcaosdb_SOURCE_DIR}/include>
-   ${libcaosdb_BINARY_DIR}/include>
-   ${CONAN_INCLUDE_DIRS}
-   )
-
 set(CMAKE_INSTALL_PREFIX "$ENV{HOME}/.local/")
 # Install libcaosdb in CMAKE_INSTALL_PREFIX (defaults to /usr/local on linux).
 # To change the install location, run
@@ -244,7 +171,6 @@ install(
     # targets to install
     TARGETS
         caosdb
-        caosdb_info_v1alpha1
         ${_GRPC_DEPS}
     # name of the CMake "export group" containing the targets we want to install
     EXPORT caosdbTargets
@@ -306,7 +232,6 @@ if(AUTOFORMATTING)
     file(GLOB format_test_sources test/*.cpp)
     execute_process(COMMAND clang-format -i --verbose ${libcaosdb_INCL}
         ${libcaosdb_SRC} ${libcaosdb_TEST_SRC}
-        ${PROJECT_SOURCE_DIR}/src/caosdbcli.cpp
         ${format_test_sources}
         WORKING_DIRECTORY ${PROJECT_SOURCE_DIR})
 endif()
diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
index a71690fae1670511fdf270f9941239404423d8cb..c3bebc2d63c13e849ed6a5894cd4cf001f63b151 100644
--- a/include/CMakeLists.txt
+++ b/include/CMakeLists.txt
@@ -20,16 +20,9 @@
 
 # add all header files to this list
 set(libcaosdb_INCL
-    ${CMAKE_CURRENT_BINARY_DIR}/caosdb/constants.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/caosdb/connection.h
     ${CMAKE_CURRENT_SOURCE_DIR}/caosdb/authentication.h
     ${CMAKE_CURRENT_SOURCE_DIR}/caosdb/utils.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/caosdb/info.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/caosdb/exceptions.h
     )
 
 # pass variable to parent scope
 set(libcaosdb_INCL ${libcaosdb_INCL} PARENT_SCOPE)
-
-# initialize constants
-configure_file(caosdb/constants.h.in caosdb/constants.h)
diff --git a/include/caosdb/connection.h b/include/caosdb/connection.h
deleted file mode 100644
index 7c971c0cc738447942b1d6a511ce4af4e83264d6..0000000000000000000000000000000000000000
--- a/include/caosdb/connection.h
+++ /dev/null
@@ -1,146 +0,0 @@
-/*
- * This file is a part of the CaosDB Project.
- *
- * Copyright (C) 2021 Timm Fitschen <t.fitschen@indiscale.com>
- * Copyright (C) 2021 IndiScale GmbH <info@indiscale.com>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as
- * published by the Free Software Foundation, either version 3 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- *
- */
-
-#ifndef CAOSDB_CONNECTION_H
-#define CAOSDB_CONNECTION_H
-/**
- * @file caosdb/connection.h
- * @author Timm Fitschen
- * @date 2021-05-18
- * @brief Configuration and setup of the connection.
- */
-#include <iosfwd>                              // for ostream
-#include <memory>                              // for shared_ptr, unique_ptr
-#include <string>                              // for string
-#include "caosdb/info/v1alpha1/main.grpc.pb.h" // for GeneralInfoService
-namespace caosdb {
-namespace authentication {
-class Authenticator;
-} // namespace authentication
-namespace info {
-class VersionInfo;
-} // namespace info
-} // namespace caosdb
-namespace grpc {
-class ChannelCredentials;
-} // namespace grpc
-
-namespace caosdb::connection {
-using caosdb::authentication::Authenticator;
-using caosdb::info::VersionInfo;
-using caosdb::info::v1alpha1::GeneralInfoService;
-using grpc::ChannelCredentials;
-
-class CACertificateProvider {
-public:
-  [[nodiscard]] auto virtual getCACertPem() const -> std::string = 0;
-};
-
-class PemFileCACertProvider : public CACertificateProvider {
-private:
-  std::string cacert;
-
-public:
-  explicit PemFileCACertProvider(const std::string &path);
-  [[nodiscard]] auto getCACertPem() const -> std::string override;
-};
-
-class PemCACertProvider : public CACertificateProvider {
-private:
-  std::string cacert;
-
-public:
-  explicit PemCACertProvider(const std::string &cacert);
-  [[nodiscard]] auto getCACertPem() const -> std::string override;
-};
-
-/**
- * @brief Configuration of the CaosDB connection.
- */
-class CaosDBConnectionConfig {
-private:
-  std::string host;
-  int port;
-
-public:
-  CaosDBConnectionConfig(const std::string &host, int port);
-  friend auto operator<<(std::ostream &out,
-                         const CaosDBConnectionConfig &config)
-    -> std::ostream &;
-
-  [[nodiscard]] auto virtual toString() const -> std::string = 0;
-  [[nodiscard]] auto getHost() const -> std::string;
-  [[nodiscard]] auto getPort() const -> int;
-  [[nodiscard]] auto virtual getChannelCredentials() const
-    -> std::shared_ptr<ChannelCredentials> = 0;
-};
-
-class InsecureCaosDBConnectionConfig : public CaosDBConnectionConfig {
-private:
-  std::shared_ptr<ChannelCredentials> credentials;
-
-public:
-  InsecureCaosDBConnectionConfig(const std::string &host, int port);
-  InsecureCaosDBConnectionConfig(
-    const std::string &host, int port,
-    const std::shared_ptr<Authenticator> &authenticator);
-  [[nodiscard]] auto getChannelCredentials() const
-    -> std::shared_ptr<ChannelCredentials> override;
-  [[nodiscard]] auto toString() const -> std::string override;
-};
-
-class SslCaosDBConnectionConfig : public CaosDBConnectionConfig {
-private:
-  std::shared_ptr<ChannelCredentials> credentials;
-  std::string cacert;
-
-public:
-  SslCaosDBConnectionConfig(
-    const std::string &host, int port,
-    const std::shared_ptr<CACertificateProvider> &cacert);
-  SslCaosDBConnectionConfig(
-    const std::string &host, int port,
-    const std::shared_ptr<CACertificateProvider> &cacert,
-    const std::shared_ptr<Authenticator> &authenticator);
-  [[nodiscard]] auto getChannelCredentials() const
-    -> std::shared_ptr<ChannelCredentials> override;
-  [[nodiscard]] auto toString() const -> std::string override;
-};
-
-/**
- * @brief A reusable connection to a CaosDBServer.
- */
-class CaosDBConnection {
-  std::shared_ptr<grpc::Channel> channel;
-  std::shared_ptr<CaosDBConnectionConfig> config;
-  std::unique_ptr<GeneralInfoService::Stub> stub_;
-
-public:
-  explicit CaosDBConnection(
-    const std::shared_ptr<CaosDBConnectionConfig> &config);
-  friend auto operator<<(std::ostream &out, const CaosDBConnection &connection)
-    -> std::ostream &;
-  [[nodiscard]] auto getGeneralInfoService() const
-    -> GeneralInfoService::Stub &;
-  [[nodiscard]] auto getVersionInfo() const -> std::unique_ptr<VersionInfo>;
-};
-} // namespace caosdb::connection
-#endif
diff --git a/include/caosdb/exceptions.h b/include/caosdb/exceptions.h
deleted file mode 100644
index 59ff3d4f08f6a8718faa2eb2e065d4ed5b04c493..0000000000000000000000000000000000000000
--- a/include/caosdb/exceptions.h
+++ /dev/null
@@ -1,49 +0,0 @@
-/*
- * This file is a part of the CaosDB Project.
- *
- * Copyright (C) 2021 Timm Fitschen <t.fitschen@indiscale.com>
- * Copyright (C) 2021 IndiScale GmbH <info@indiscale.com>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as
- * published by the Free Software Foundation, either version 3 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- *
- */
-
-#ifndef CAOSDB_EXCEPTIONS_H
-#define CAOSDB_EXCEPTIONS_H
-#include <stdexcept>
-#include <string>
-
-namespace caosdb::exceptions {
-using std::runtime_error;
-
-/**
- * @brief Exception for authentication errors.
- */
-class AuthenticationError : public runtime_error {
-public:
-  explicit AuthenticationError(const std::string &what_arg)
-    : runtime_error(what_arg) {}
-};
-
-/**
- * @brief The connection to the CaosDB server is down.
- */
-class ConnectionError : public runtime_error {
-public:
-  explicit ConnectionError(const std::string &what_arg)
-    : runtime_error(what_arg) {}
-};
-
-} // namespace caosdb::exceptions
-#endif
diff --git a/include/caosdb/info.h b/include/caosdb/info.h
deleted file mode 100644
index e5961cd862c2dd3bc469e23bdaf4b0278e9a2980..0000000000000000000000000000000000000000
--- a/include/caosdb/info.h
+++ /dev/null
@@ -1,55 +0,0 @@
-/*
- * This file is a part of the CaosDB Project.
- *
- * Copyright (C) 2021 Timm Fitschen <t.fitschen@indiscale.com>
- * Copyright (C) 2021 IndiScale GmbH <info@indiscale.com>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as
- * published by the Free Software Foundation, either version 3 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- *
- */
-
-#ifndef CAOSDB_INFO_H
-#define CAOSDB_INFO_H
-/**
- * @file caosdb/info.h
- * @author Timm Fitschen
- * @date 2021-07-02
- * @brief General information about the CaosDBServer.
- */
-#include <cstdint>                        // for uint32_t
-#include <string>                         // for string
-#include "caosdb/info/v1alpha1/main.pb.h" // for VersionInfo
-
-namespace caosdb::info {
-
-using ProtoVersionInfo = caosdb::info::v1alpha1::VersionInfo;
-
-/**
- * @brief Wrapper class for the VersionInfo protobuf.
- */
-class VersionInfo {
-private:
-  ProtoVersionInfo *info;
-
-public:
-  explicit VersionInfo(ProtoVersionInfo *info);
-  [[nodiscard]] auto GetMajor() const -> uint32_t;
-  [[nodiscard]] auto GetMinor() const -> uint32_t;
-  [[nodiscard]] auto GetPatch() const -> uint32_t;
-  [[nodiscard]] auto GetPreRelease() const -> const std::string &;
-  [[nodiscard]] auto GetBuild() const -> const std::string &;
-};
-
-} // namespace caosdb::info
-#endif
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 5f7f41cca95200ede736b84694a36b16388644cd..f2ee51d0beaa6225db7cda0d00225e7b1fce7a5c 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -22,8 +22,6 @@
 # add all source files to this list
 set(libcaosdb_SRC
     ${CMAKE_CURRENT_SOURCE_DIR}/caosdb/authentication.cpp
-    ${CMAKE_CURRENT_SOURCE_DIR}/caosdb/connection.cpp
-    ${CMAKE_CURRENT_SOURCE_DIR}/caosdb/info.cpp
     )
 
 # pass variable to parent scope
diff --git a/src/caosdb/connection.cpp b/src/caosdb/connection.cpp
deleted file mode 100644
index 81339c2d397c70b413fd7da32a9a000bfed52810..0000000000000000000000000000000000000000
--- a/src/caosdb/connection.cpp
+++ /dev/null
@@ -1,183 +0,0 @@
-/*
- *
- * This file is a part of the CaosDB Project.
- *
- * Copyright (C) 2021 Timm Fitschen <t.fitschen@indiscale.com>
- * Copyright (C) 2021 IndiScale GmbH <info@indiscale.com>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as
- * published by the Free Software Foundation, either version 3 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- *
- */
-#include "caosdb/connection.h"
-#include <grpcpp/create_channel.h>                // for CreateChannel
-#include <grpcpp/impl/codegen/client_context.h>   // for ClientContext
-#include <grpcpp/impl/codegen/status.h>           // for Status
-#include <grpcpp/security/credentials.h>          // for SslCredentials
-#include <iostream>                               // for operator<<, basic_...
-#include <stdexcept>                              // for runtime_error
-#include <string>                                 // for operator+, char_tr...
-#include "caosdb/authentication.h"                // for Authenticator
-#include "caosdb/exceptions.h"                    // for AuthenticationError
-#include "caosdb/info/v1alpha1/main.grpc.pb.h"    // for GeneralInfoService
-#include "caosdb/info/v1alpha1/main.pb.h"         // for GetVersionInfoResp...
-#include "caosdb/utils.h"                         // for load_string_file
-#include "caosdb/info.h"                          // for VersionInfo
-#include "grpcpp/impl/codegen/status_code_enum.h" // for StatusCode, UNAUTH...
-namespace grpc {
-class Channel;
-} // namespace grpc
-
-namespace caosdb::connection {
-using caosdb::authentication::Authenticator;
-using caosdb::exceptions::AuthenticationError;
-using caosdb::exceptions::ConnectionError;
-using caosdb::info::VersionInfo;
-using caosdb::info::v1alpha1::GeneralInfoService;
-using caosdb::info::v1alpha1::GetVersionInfoRequest;
-using caosdb::info::v1alpha1::GetVersionInfoResponse;
-using caosdb::utils::load_string_file;
-using grpc::InsecureChannelCredentials;
-using grpc::SslCredentials;
-using grpc::SslCredentialsOptions;
-
-PemFileCACertProvider::PemFileCACertProvider(const std::string &path) {
-  this->cacert = load_string_file(path);
-}
-
-auto PemFileCACertProvider::getCACertPem() const -> std::string {
-  return this->cacert;
-}
-
-PemCACertProvider::PemCACertProvider(const std::string &cacert) {
-  this->cacert = cacert;
-}
-
-auto PemCACertProvider::getCACertPem() const -> std::string {
-  return this->cacert;
-}
-
-CaosDBConnectionConfig::CaosDBConnectionConfig(const std::string &host,
-                                               int port) {
-  this->host = host;
-  this->port = port;
-}
-
-auto CaosDBConnectionConfig::getHost() const -> std::string {
-  return this->host;
-}
-
-auto CaosDBConnectionConfig::getPort() const -> int { return this->port; }
-
-auto operator<<(std::ostream &out, const CaosDBConnectionConfig &config)
-  -> std::ostream & {
-  out << config.toString();
-  return out;
-}
-
-InsecureCaosDBConnectionConfig::InsecureCaosDBConnectionConfig(
-  const std::string &host, int port)
-  : CaosDBConnectionConfig(host, port) {
-  this->credentials = InsecureChannelCredentials();
-}
-
-InsecureCaosDBConnectionConfig::InsecureCaosDBConnectionConfig(
-  const std::string &host, int port,
-  const std::shared_ptr<Authenticator> &authenticator)
-  : CaosDBConnectionConfig(host, port) {
-  this->credentials = grpc::CompositeChannelCredentials(
-    InsecureChannelCredentials(), authenticator->getCallCredentials());
-}
-
-auto InsecureCaosDBConnectionConfig::getChannelCredentials() const
-  -> std::shared_ptr<ChannelCredentials> {
-  return this->credentials;
-}
-
-auto InsecureCaosDBConnectionConfig::toString() const -> std::string {
-  return "InsecureCaosDBConnectionConfig(" + this->getHost() + "," +
-         std::to_string(this->getPort()) + ")";
-}
-
-SslCaosDBConnectionConfig::SslCaosDBConnectionConfig(
-  const std::string &host, int port,
-  const std::shared_ptr<CACertificateProvider> &cacert)
-  : CaosDBConnectionConfig(host, port) {
-  SslCredentialsOptions options;
-  options.pem_root_certs = cacert->getCACertPem();
-  this->cacert = cacert->getCACertPem();
-  this->credentials = SslCredentials(options);
-}
-
-SslCaosDBConnectionConfig::SslCaosDBConnectionConfig(
-  const std::string &host, int port,
-  const std::shared_ptr<CACertificateProvider> &cacert,
-  const std::shared_ptr<Authenticator> &authenticator)
-  : CaosDBConnectionConfig(host, port) {
-
-  SslCredentialsOptions options;
-  options.pem_root_certs = cacert->getCACertPem();
-  this->cacert = cacert->getCACertPem();
-  this->credentials = grpc::CompositeChannelCredentials(
-    SslCredentials(options), authenticator->getCallCredentials());
-}
-
-auto SslCaosDBConnectionConfig::getChannelCredentials() const
-  -> std::shared_ptr<ChannelCredentials> {
-  return this->credentials;
-}
-
-auto SslCaosDBConnectionConfig::toString() const -> std::string {
-  return "SslCaosDBConnectionConfig(" + this->getHost() + "," +
-         std::to_string(this->getPort()) + "," + this->cacert + ")";
-}
-
-CaosDBConnection::CaosDBConnection(
-  const std::shared_ptr<CaosDBConnectionConfig> &config) {
-  this->config = config;
-  const std::string target =
-    this->config->getHost() + ":" + std::to_string(this->config->getPort());
-  this->channel =
-    grpc::CreateChannel(target, this->config->getChannelCredentials());
-  this->stub_ = GeneralInfoService::NewStub(this->channel);
-}
-
-auto operator<<(std::ostream &out, const CaosDBConnection &connection)
-  -> std::ostream & {
-  out << "CaosDBConnection(" << *(connection.config) << ")";
-  return out;
-}
-
-[[nodiscard]] auto CaosDBConnection::getVersionInfo() const
-  -> std::unique_ptr<VersionInfo> {
-  const GetVersionInfoRequest request;
-  GetVersionInfoResponse response;
-  grpc::ClientContext context;
-  const grpc::Status status =
-    this->stub_->GetVersionInfo(&context, request, &response);
-
-  if (!status.ok()) {
-    switch (status.error_code()) {
-    case grpc::StatusCode::UNAUTHENTICATED:
-      throw AuthenticationError(status.error_message());
-    case grpc::StatusCode::UNAVAILABLE:
-      throw ConnectionError(status.error_message());
-    default:
-      std::cout << status.error_code() << "\n";
-      throw std::runtime_error(status.error_message());
-    }
-  }
-  return std::make_unique<VersionInfo>(response.release_version_info());
-}
-
-} // namespace caosdb::connection
diff --git a/src/caosdb/info.cpp b/src/caosdb/info.cpp
deleted file mode 100644
index b492dade80118abd331019adc5272511c50266d1..0000000000000000000000000000000000000000
--- a/src/caosdb/info.cpp
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is a part of the CaosDB Project.
- *
- * Copyright (C) 2021 Timm Fitschen <t.fitschen@indiscale.com>
- * Copyright (C) 2021 IndiScale GmbH <info@indiscale.com>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as
- * published by the Free Software Foundation, either version 3 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- *
- */
-
-#include "caosdb/info.h"
-#include "caosdb/info/v1alpha1/main.pb.h" // for GetVersionInfoResponse
-
-namespace caosdb::info {
-using ProtoVersionInfo = caosdb::info::v1alpha1::VersionInfo;
-
-VersionInfo::VersionInfo(ProtoVersionInfo *info) { this->info = info; }
-
-[[nodiscard]] auto VersionInfo::GetMajor() const -> uint32_t {
-  return this->info->major();
-}
-
-[[nodiscard]] auto VersionInfo::GetMinor() const -> uint32_t {
-  return this->info->minor();
-}
-
-[[nodiscard]] auto VersionInfo::GetPatch() const -> uint32_t {
-  return this->info->patch();
-}
-
-[[nodiscard]] auto VersionInfo::GetPreRelease() const -> const std::string & {
-  return this->info->pre_release();
-}
-
-[[nodiscard]] auto VersionInfo::GetBuild() const -> const std::string & {
-  return this->info->build();
-}
-
-} // namespace caosdb::info
diff --git a/src/caosdbcli.cpp b/src/caosdbcli.cpp
deleted file mode 100644
index 7dc2d718317d6d9be2f2d1166bcaa658c78b6ecf..0000000000000000000000000000000000000000
--- a/src/caosdbcli.cpp
+++ /dev/null
@@ -1,68 +0,0 @@
-/*
- *
- * This file is a part of the CaosDB Project.
- *
- * Copyright (C) 2021 Timm Fitschen <t.fitschen@indiscale.com>
- * Copyright (C) 2021 IndiScale GmbH <info@indiscale.com>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as
- * published by the Free Software Foundation, either version 3 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- *
- */
-
-// A simple caosdb client
-#include <iostream>
-#include <memory>
-#include <string>
-#include "caosdb/constants.h"
-#include "caosdb/connection.h"
-#include "caosdb/authentication.h"
-#include "caosdb/utils.h"
-#include "caosdb/info.h"
-
-auto main() -> int {
-
-  std::cout << "CaosDB (libcaosdb " << caosdb::LIBCAOSDB_VERSION_MINOR << "."
-            << caosdb::LIBCAOSDB_VERSION_MINOR << "."
-            << caosdb::LIBCAOSDB_VERSION_PATCH << ")" << std::endl;
-  std::cout << "We don't miss the H of caos." << std::endl;
-
-  const auto pem_file =
-    caosdb::utils::get_env_var("CAOSDB_SERVER_CA_PEM", std::string());
-  const auto host =
-    caosdb::utils::get_env_var("CAOSDB_SERVER_HOST", "localhost");
-  const auto port_str =
-    caosdb::utils::get_env_var("CAOSDB_SERVER_PORT", "8443");
-  const auto port = std::stoi(port_str);
-  const auto user = caosdb::utils::get_env_var("CAOSDB_USER", "admin");
-  const auto password = caosdb::utils::get_env_var("CAOSDB_PASSWORD", "caosdb");
-  std::cout << "USER: " << user << "\n";
-  std::cout << "PORT: " << port_str << "\n";
-  std::cout << "HOST: " << host << "\n";
-  std::cout << "CACERT: " << pem_file << "\n";
-
-  auto auth =
-    std::make_shared<caosdb::authentication::PlainPasswordAuthenticator>(
-      user, password);
-  auto cacert =
-    std::make_shared<caosdb::connection::PemFileCACertProvider>(pem_file);
-  auto config = std::make_shared<caosdb::connection::SslCaosDBConnectionConfig>(
-    host, port, cacert);
-  caosdb::connection::CaosDBConnection connection(config);
-  std::cout << std::endl << connection << std::endl;
-  const auto &v_info = connection.getVersionInfo();
-  std::cout << "VersionInfo(" << v_info->GetMajor() << "." << v_info->GetMinor()
-            << "." << v_info->GetPatch() << "-" << v_info->GetPreRelease()
-            << "-" << v_info->GetBuild() << ")" << std::endl;
-  return 0;
-}
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index d1e1c4df28c3f0398a26c1d87f5a2be821da2deb..cdf4a48307e293082a4eb280e2f62f555a9f6955 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -20,9 +20,8 @@
 
 # append all the test cases here (file name without the ".cpp" suffix)
 set(test_cases
-    test_connection
     test_utils
-    test_info
+    test_authentication
     )
 
 
@@ -47,7 +46,7 @@ foreach (i RANGE "${len_test_cases}")
     set(libcaosdb_TEST_SRC "${CMAKE_CURRENT_SOURCE_DIR}/${test_case_name}.cpp
         ${libcaosdb_TEST_SRC}")
     target_link_libraries(${test_case_name} PRIVATE caosdb
-        caosdb_info_v1alpha1 ${CONAN_LIBS_GTEST} ${CONAN_LIBS_BOOST})
+        ${CONAN_LIBS_GTEST} ${CONAN_LIBS_BOOST})
     if(_LINTING)
     set_target_properties(${test_case_name}
         PROPERTIES
diff --git a/include/caosdb/constants.h.in b/test/test_authentication.cpp
similarity index 60%
rename from include/caosdb/constants.h.in
rename to test/test_authentication.cpp
index 02c0341d17b77bbf843debea349af45b91516662..67019eee389cf02a27a78c43308972e5402a1825 100644
--- a/include/caosdb/constants.h.in
+++ b/test/test_authentication.cpp
@@ -1,5 +1,5 @@
+
 /*
- *
  * This file is a part of the CaosDB Project.
  *
  * Copyright (C) 2021 Timm Fitschen <t.fitschen@indiscale.com>
@@ -19,14 +19,18 @@
  * along with this program. If not, see <https://www.gnu.org/licenses/>.
  *
  */
+#include <memory>                  // for allocator
+#include "caosdb/authentication.h" // for PlainPasswordAuthenticator
+#include "gtest/gtest_pred_impl.h" // for Test, SuiteApiResolver, TEST, Tes...
+
+namespace caosdb::connection {
+using caosdb::authentication::PlainPasswordAuthenticator;
+
+TEST(test_connection, connection_ssl_authentication_error_wrong_credentials) {
+  const auto *const user = "not-a-user-23461237";
+  const auto *const password = "very-c-cred";
+
+  auto auth = PlainPasswordAuthenticator(user, password);
+}
 
-#ifndef CAOSDB_CONSTANTS_H
-#define CAOSDB_CONSTANTS_H
-namespace caosdb {
-// clang-format off
-constexpr int LIBCAOSDB_VERSION_MAJOR = @libcaosdb_VERSION_MAJOR@;
-constexpr int LIBCAOSDB_VERSION_MINOR = @libcaosdb_VERSION_MINOR@;
-constexpr int LIBCAOSDB_VERSION_PATCH = @libcaosdb_VERSION_PATCH@;
-// clang-format on
-} // namespace caosdb
-#endif
+} // namespace caosdb::connection