How To Fix 00623 - No list of servers received

00623 - Overview

• Message type: E = Error

• Message class: 00 -

• Message number: 623

• Message text: No list of servers received

What causes this issue?

A list of logged on application servers was requested from the message
server; however, an error occurred.
This may be because:
The request could not be sent.
The application server is not connected to the message server.
The message server is not active.

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 the system log for more information about possible causes of the
error. To analyze the entries, call transaction SM21. If you do not
have authorization for this transaction, have your system administrator
analyze and fix the error.

Error message extract from SAP system. Copyright SAP SE.

00623 - Details

• The SAP error message "00623 No list of servers received" typically indicates a communication issue between the SAP GUI and the SAP application server. This error can occur for various reasons, and understanding the cause is essential for troubleshooting. Here are some common causes, potential solutions, and related information:
  Causes:
  
  Network Issues: There may be network connectivity problems between the SAP GUI and the application server.
  SAP Router Configuration: If you are using an SAP router, it may not be configured correctly, preventing the GUI from receiving the list of available servers.
  Application Server Down: The application server you are trying to connect to may be down or not responding.
  Incorrect SAP GUI Configuration: The SAP GUI may not be configured correctly, leading to communication issues.
  Firewall Restrictions: Firewalls may be blocking the necessary ports for SAP communication.
  SAP System Configuration: There may be issues with the SAP system configuration, such as missing or incorrect entries in