How To Fix Q2305 - No application server found on database host - rsh/gateway will be used

SAP Error Message - Details

• Message type: E = Error

• Message class: Q2 - Messages for Development Classes SDBO and SDBA

• Message number: 305

• Message text: No application server found on database host - rsh/gateway will be used

What causes this issue?

No R/3 application server is installed on the database host. It is
necessary to use a Remote Function Call to this server for certain
functions.

System Response

System attempts to access the application server using a different
method (remote shell, SAP gateway).

How to fix this error?

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

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 Q2305 - No application server found on database host - rsh/gateway will be used ?

  The SAP error message Q2305 indicates that the system is unable to find an application server on the specified database host. This typically occurs in scenarios where the SAP system is trying to connect to the database but cannot locate the application server that should be handling the request. Here are some potential causes, solutions, and related information for this error:
  Causes:
  
  Network Issues: There may be network connectivity problems between the application server and the database server.
  Configuration Errors: The SAP system might be misconfigured, leading to incorrect hostnames or IP addresses being used for the database connection.
  Database Server Down: The database server may be down or not running, preventing the application server from connecting.
  Gateway Issues: The SAP gateway might not be functioning correctly, which can prevent communication between the application server and the database.
  Firewall Restrictions: Firewalls or security settings may be blocking the necessary ports for communication between the application server and the database server.
  
  Solutions:
  
  
  Check Network Connectivity:
  
  Use tools like ping or telnet to verify that the application server can reach the database server.
  Ensure that the network configuration allows for communication between the two servers.
  
  
  
  Review Configuration Settings:
  
  Check the instance profile and SAP GUI settings to ensure that the database host and instance numbers are correctly configured.
  Verify the tnsnames.ora file (for Oracle databases) or equivalent configuration files for other databases to ensure correct entries.
  
  
  
  Database Server Status:
  
  Ensure that the database server is up and running. You can check the database logs or use database management tools to verify its status.
  
  
  
  Check Gateway Configuration:
  
  Ensure that the SAP gateway is running and properly configured. You can check the gateway logs for any errors or issues.
  
  
  
  Firewall and Security Settings:
  
  Review firewall settings to ensure that the necessary ports (e.g., 3200 for SAP, 1521 for Oracle) are open and not being blocked.
  
  
  
  Restart Services:
  
  Sometimes, simply restarting the SAP application server or the database server can resolve transient issues.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to error Q2305 for any specific patches or updates that may address this issue.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  Logs: Review the SAP system logs (transaction SM21) and the database logs for any additional error messages that could provide more context on the issue.
  
  If the problem persists after trying the above solutions, it may be necessary to involve your SAP Basis team or consult with SAP support for further assistance.