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

RT312 - Overview

• 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