How To Fix RT312 - Error communicating with application server &1

SAP Error Message - Details

• Message type: E = Error

• Message class: RT - Monitoring infrastructure MSG and alert texts

• Message number: 312

• Message text: Error communicating with application server &1

What causes this issue?

The system is unable to communicate with the application server that is
specified. This is caused by RFC communication problems.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Normally, you should see few or no calls with communication problems.
However, communication problems do not necessarily represent a problem.
For example, CPI-C errors may occur if a server or system is down for
maintenance. If the destination is returned to service before the retry
interval runs out, then the tRFC calls and LUWs are automatically
processed.
If the CPI-C errors are not caused by a routine problem such as
servicing, then you should check the network connection to the
destination server. In addition to actual network problems, CPI-C errors
may be caused by:
An inactive gateway process in the calling or destination System
An incorrect CPI-C implementation in an external server
Incorrect data in the definition of the destination in the calling
system (transaction SM59).
You can test connections to RFC destinations in Transaction SM59.
After you have corrected the problem, the tRFC calls and LUWs that were
affected are automatically processed, if the retry interval has not
elapsed.
Otherwise, you can trigger processing an affected LUW by hand in
Transaction SM58 (the analysis method for tRFC).
Once successfully processed, calls with communication errors are
automatically deleted from the tRFC work queue, and will no longer
appear in this monitor.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RT312 - Error communicating with application server &1 ?

  The SAP error message RT312, which states "Error communicating with application server &1," typically indicates a communication issue between the SAP GUI (Graphical User Interface) and the application server. This can occur due to various reasons, and here are some common causes, potential solutions, and related information:
  Causes:
  
  Network Issues: Problems with the network connection between the client and the application server can lead to this error. This could be due to network outages, firewalls, or routing issues.
  Application Server Down: The specific application server you are trying to connect to may be down or not responding.
  Incorrect Configuration: The SAP GUI may be incorrectly configured, such as wrong server details or connection parameters.
  SAP Kernel Issues: There may be issues with the SAP kernel or the application server itself, such as bugs or misconfigurations.
  Resource Limitations: The application server may be overloaded or running out of resources (e.g., memory, CPU).
  Firewall/Proxy Settings: Firewalls or proxy settings may be blocking the communication between the SAP GUI and the application server.
  
  Solutions:
  
  Check Network Connectivity: Ensure that you have a stable network connection. You can use tools like ping or traceroute to check connectivity to the application server.
  Verify Application Server Status: Check if the application server is up and running. You can do this by logging into the SAP system through another client or checking with your system administrator.
  Review SAP GUI Configuration: Ensure that the SAP GUI is correctly configured with the right application server details (hostname, instance number, etc.).
  Check SAP Notes: Look for any relevant SAP Notes that may address known issues with the version of SAP you are using. SAP Notes can provide patches or workarounds.
  Restart SAP Services: If you have access, try restarting the SAP services on the application server to resolve any temporary issues.
  Check Firewall/Proxy Settings: Ensure that any firewalls or proxies are configured to allow traffic to and from the SAP application server.
  Consult System Logs: Check the system logs (transaction SM21) for any error messages that might provide more context about the issue.
  
  Related Information:
  
  SAP Support: If the issue persists, consider reaching out to SAP Support for assistance. They can provide more detailed troubleshooting based on your specific environment.
  SAP Community: The SAP Community forums can be a valuable resource for finding similar issues and solutions shared by other users.
  Documentation: Review the official SAP documentation for your version to understand any specific configurations or requirements.
  
  By following these steps, you should be able to diagnose and potentially resolve the RT312 error. If the problem continues, further investigation may be necessary, possibly involving your IT department or SAP support.