Message type: E = Error
Message class:  CNV_IUUC_REPLICATION - IUUC replication messages (HANA) 
Message number: 395
Message text: Error reading connection data; Connection Name &1 unknown
Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.
To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.
Unfortunately, there isn't any extra information in this error notice.
First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).
Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.
You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.
The SAP error message CNV_IUUC_REPLICATION395 indicates that there is an issue with reading connection data for a specific connection name, which is reported as unknown. This error typically occurs in the context of SAP Landscape Transformation (SLT) replication setups, where data is being replicated from one system to another.
Cause: Incorrect Connection Name: The connection name specified in the configuration might be incorrect or misspelled. Missing Configuration: The connection might not be properly configured in the SLT system. Authorization Issues: The user executing the operation may not have the necessary authorizations to access the connection data. Technical Issues: There could be underlying technical issues with the SLT setup or the database connections.
Solution: Verify Connection Name: Check the connection name being used in the configuration. Ensure that it matches the name defined in the SLT configuration. Check SLT Configuration: Go to the SLT configuration transaction (usually LTRC or LTMOM) and verify that the connection is properly set up
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_IUUC_REPLICATION394 Error while deleting configuration; see next error message for details
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_IUUC_REPLICATION393 Error reading configuration data; see next error message for details
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_IUUC_REPLICATION396 Error while creating configuration &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_IUUC_REPLICATION397 Error creating configuration &1; Target System Connection &2 already used
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.