diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3bdcb8c0730e90929ce25970850b0c801f1f6d09..119f21b574bb6a3eec6cdf71be265450e8497290 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 * Integer values are 32 bit now.
+* Rename UnkownConnectionError to ConnectionConfigurationError
 
 ### Deprecated
 
diff --git a/include/caosdb/exceptions.h b/include/caosdb/exceptions.h
index 304216679200329660c5068362fa9e089f089235..e10b3db97ff7a427f9e1e00398f43b8bdb94517d 100644
--- a/include/caosdb/exceptions.h
+++ b/include/caosdb/exceptions.h
@@ -103,10 +103,10 @@ public:
 /**
  * @brief The connection isn't known to the ConnectionManager under this name.
  */
-class UnknownConnectionError : public Exception {
+class ConnectionConfigurationError : public Exception {
 public:
-  explicit UnknownConnectionError(const std::string &what_arg)
-    : Exception(StatusCode::UNKNOWN_CONNECTION_ERROR, what_arg) {}
+  explicit ConnectionConfigurationError(const std::string &what_arg)
+    : Exception(StatusCode::CONNECTION_CONFIGURATION_ERROR, what_arg) {}
 };
 
 } // namespace caosdb::exceptions
diff --git a/include/caosdb/status_code.h b/include/caosdb/status_code.h
index f6122601f740e54f3f2b9bd72966e6c68de0b279..e1a382191b5bd4559c554e2fc3e084103c27c3cc 100644
--- a/include/caosdb/status_code.h
+++ b/include/caosdb/status_code.h
@@ -62,7 +62,7 @@ enum StatusCode {
   GENERIC_ERROR = 21,
   GENERIC_TRANSACTION_ERROR = 22,
   CONFIGURATION_ERROR = 23,
-  UNKNOWN_CONNECTION_ERROR = 24,
+  CONNECTION_CONFIGURATION_ERROR = 24,
   TRANSACTION_STATUS_ERROR = 25,
   TRANSACTION_TYPE_ERROR = 26,
   UNSUPPORTED_FEATURE = 27,
@@ -77,7 +77,6 @@ enum StatusCode {
   FILE_DOWNLOAD_ERROR = 36,
   ENUM_MAPPING_ERROR = 37,
   SPOILED = 38,
-  FILE_CANNOT_BE_READ = 39,
   OTHER_CLIENT_ERROR = 9999,
 };
 
diff --git a/include/caosdb/utility.h b/include/caosdb/utility.h
index 68e34eaceb2fa25c5fe07c8db822a8639382bbc5..5af1b491c0b5b9d48606ba6b46130b3ef3de1d9c 100644
--- a/include/caosdb/utility.h
+++ b/include/caosdb/utility.h
@@ -88,13 +88,7 @@ auto getEnumValueFromName<caosdb::entity::Role>(const std::string &name) -> caos
  */
 inline auto load_string_file(const path &path) -> std::string {
   std::string result;
-  // TODO(htw)
-  // try {
   boost::filesystem::load_string_file(path, result);
-  // } catch (const std::exception &exc) {
-  //   throw caosdb::exceptions::Exception(StatusCode::FILE_CANNOT_BE_READ ,
-  //                                         "Cannot read the following file: "+ path.string());
-  // }
   return result;
 }
 
diff --git a/src/caosdb/connection.cpp b/src/caosdb/connection.cpp
index 9d27c5c2b14ca0df8ada7ddc8bf5250059291c46..d1b80d068554b8796ccfa1dfa1368070f52281bd 100644
--- a/src/caosdb/connection.cpp
+++ b/src/caosdb/connection.cpp
@@ -109,8 +109,8 @@ auto ConnectionManager::mGetConnection(const std::string &name) const
       auto connection = ConfigurationManager::GetConnectionConfiguration(name);
       connections[name] = std::make_shared<Connection>(*connection.release());
     } catch (const caosdb::exceptions::ConfigurationError &exc) {
-      throw caosdb::exceptions::UnknownConnectionError("Error with the connection named '" + name +
-                                                       "': " + exc.what());
+      throw caosdb::exceptions::ConnectionConfigurationError("Error with the connection named '" +
+                                                             name + "': " + exc.what());
     }
   }
   return this->connections.at(name);
diff --git a/src/caosdb/status_code_description.cpp b/src/caosdb/status_code_description.cpp
index d5e08e7820ca0f7380723087570f838465a9c261..5823943cfd7f79416cabb61662f778bac5de9bf8 100644
--- a/src/caosdb/status_code_description.cpp
+++ b/src/caosdb/status_code_description.cpp
@@ -131,8 +131,9 @@ auto get_status_description(int code) -> const std::string & {
      "The transaction terminated unsuccessfully with transaction errors."},
     {StatusCode::CONFIGURATION_ERROR,
      "An error occurred during the configuration of the ConfigurationManager."},
-    {StatusCode::UNKNOWN_CONNECTION_ERROR,
-     "The ConnectionManager does not know any connection of this name."},
+    {StatusCode::CONNECTION_CONFIGURATION_ERROR,
+     "Wither there is no connection of the given name or the given connection has a faulty "
+     "configuration"},
     {StatusCode::TRANSACTION_STATUS_ERROR,
      "The Transaction is in a wrong state for the attempted action."},
     {StatusCode::TRANSACTION_TYPE_ERROR,
diff --git a/src/ccaosdb.cpp b/src/ccaosdb.cpp
index 853b3c179f082c6afdae8e2126bf52e69d34e680..77759fce1d216f215dfccd343aa8202b2ec911fa 100644
--- a/src/ccaosdb.cpp
+++ b/src/ccaosdb.cpp
@@ -248,7 +248,6 @@ ERROR_RETURN_CODE(GENERIC_ERROR,
                     if (out->_deletable) {
                       return caosdb::StatusCode::EXTERN_C_ASSIGNMENT_ERROR;
                     }
-                    // TODO(htw) eitehr check for file existence or call CreateCertificateProvider?
                     out->wrapped_certificate_provider =
                       new caosdb::configuration::PemFileCertificateProvider(std::string(path));
                     out->_deletable = true;
diff --git a/test/test_connection.cpp b/test/test_connection.cpp
index 3b81ab9f3e307c2aaaa248a5d5ae4350537448b9..4a5260e10964bc652c4ac803bf376b6b6cf39ead 100644
--- a/test/test_connection.cpp
+++ b/test/test_connection.cpp
@@ -22,7 +22,7 @@
 #include "caosdb/certificate_provider.h" // for PemCertificateProvider
 #include "caosdb/configuration.h"        // for InsecureConnectionConfigura...
 #include "caosdb/connection.h"           // for ConnectionManager
-#include "caosdb/exceptions.h"           // for UnknownConnectionError
+#include "caosdb/exceptions.h"           // for ConnectionConfigurationError
 #include "caosdb_test_utility.h"         // for EXPECT_THROW_MESSAGE, TEST_...
 #include <gtest/gtest-message.h>         // for Message
 #include <gtest/gtest-test-part.h>       // for SuiteApiResolver, TestPartR...
@@ -66,13 +66,13 @@ TEST_F(test_connection, configure_ssl_localhost_8080) {
 
 TEST_F(test_connection, connection_manager_unknown_connection) {
   EXPECT_THROW_MESSAGE(
-    ConnectionManager::GetConnection("test"), caosdb::exceptions::UnknownConnectionError,
+    ConnectionManager::GetConnection("test"), caosdb::exceptions::ConnectionConfigurationError,
     "Error with the connection named 'test': The connection 'test' has not been defined.");
 }
 
 TEST_F(test_connection, connection_missing_certificate) {
   EXPECT_THROW_MESSAGE(ConnectionManager::GetConnection("missing"),
-                       caosdb::exceptions::UnknownConnectionError,
+                       caosdb::exceptions::ConnectionConfigurationError,
                        std::string("Error with the connection named 'missing': ") +
                          "File does not exist (server_certificate_path): /missing");
 }