Message type: E = Error
Message class:  CNVMBTRFC - Messages used in RFC Management and its objects 
Message number: 103
Message text: Destination &1 with communication failure message '&2'.
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 CNVMBTRFC103 indicates a communication failure with a specific destination in the context of Remote Function Calls (RFC). This error typically arises during data migration or when using the SAP Landscape Transformation (SLT) tool, and it can be caused by various issues related to network connectivity, configuration, or system settings. Causes: Network Issues: There may be network connectivity problems between the source and target systems. RFC Destination Configuration: The RFC destination may not be correctly configured in the SAP system. This includes incorrect parameters such as the target system's IP address, port, or user credentials. Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations to perform the required actions. System Availability: The target system may be down or not reachable due to maintenance or other issues. Firewall Restrictions: Firewalls or security settings may be blocking the communication between the systems. SAP Gateway Issues: Problems with the SAP
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNVMBTRFC102 Destination &1 with system failure message '&2'.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNVMBTRFC101 Packid &1 used in client &2 in subproject &3.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNVMBTRFC104 Subproject &1 with more than active packages
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNVMBTRFC105 CWB packages couldn¦t be synchronized with the execution system
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.