How To Fix ESH_ADM_MSG154 - Error while opening an RFC connection. Cannot connect to &1 &2

SAP Error Message - Details

• Message type: E = Error

• Message class: ESH_ADM_MSG - ESH Administration and Monitoring Tool

• Message number: 154

• Message text: Error while opening an RFC connection. Cannot connect to &1 &2

What causes this issue?

The system cannot connect to server &1 and system number &2.

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?

Check if the values specified for the server name and the system number
are correct.

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 ESH_ADM_MSG154 - Error while opening an RFC connection. Cannot connect to &1 &2 ?

  The SAP error message ESH_ADM_MSG154 indicates that there is an issue with establishing a Remote Function Call (RFC) connection to a specified system. The message typically includes placeholders for the target system's name and the connection type, which are represented as &1 and &2.
  Causes
  The error can be caused by several factors, including:
  
  Network Issues: There may be network connectivity problems between the SAP system and the target system.
  Incorrect Configuration: The RFC destination may not be configured correctly in the SAP system. This includes incorrect parameters such as the hostname, system number, client, user credentials, etc.
  Target System Down: The target SAP system may be down or not reachable.
  Firewall Restrictions: Firewalls or security settings may be blocking the connection.
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations.
  SAP Gateway Issues: The SAP Gateway service may not be running on the target system.
  
  Solutions
  To resolve the error, you can