How To Fix 01821 - System cannot be reached

SAP Error Message - Details

• Message type: E = Error

• Message class: 01 -

• Message number: 821

• Message text: System cannot be reached

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message 01821 - System cannot be reached ?

  The SAP error message "01821 System cannot be reached" typically indicates that the SAP system you are trying to connect to is not accessible. This can be due to various reasons, including network issues, system downtime, or configuration problems. Here’s a breakdown of potential causes, solutions, and related information:
  Causes:
  
  Network Issues: There may be a problem with the network connection between your client and the SAP server.
  SAP System Downtime: The SAP system might be down for maintenance or due to unexpected issues.
  Incorrect Configuration: The connection parameters (like the application server, instance number, or system ID) may be incorrectly configured in your SAP GUI or other client.
  Firewall Restrictions: Firewalls or security settings may be blocking access to the SAP server.
  SAP Router Issues: If you are using an SAP router, there may be issues with the router configuration or connectivity.
  DNS Resolution Problems: The hostname of the SAP server may not be resolving correctly due to DNS issues.
  
  Solutions:
  
  
  Check Network Connectivity:
  
  Ensure that your network connection is active and stable.
  Use tools like ping or tracert to check connectivity to the SAP server.
  
  
  
  Verify SAP System Status:
  
  Check if the SAP system is up and running. You can do this by contacting your system administrator or checking the system status through monitoring tools.
  
  
  
  Review Connection Parameters:
  
  Double-check the connection settings in your SAP GUI or client. Ensure that the application server, instance number, and system ID are correct.
  
  
  
  Firewall and Security Settings:
  
  Ensure that your firewall settings allow traffic to and from the SAP server. You may need to consult with your IT security team.
  
  
  
  Check SAP Router Configuration:
  
  If you are using an SAP router, verify that it is correctly configured and operational.
  
  
  
  DNS Configuration:
  
  Ensure that the hostname of the SAP server is correctly configured in your DNS settings. You can also try using the IP address directly instead of the hostname.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error message.
  
  
  
  Related Information:
  
  SAP GUI Configuration: Ensure that your SAP GUI is properly configured to connect to the desired SAP system.
  System Logs: Review system logs (both on the client and server side) for any additional error messages that may provide more context.
  SAP Support: If the issue persists, consider reaching out to SAP Support for further assistance.
  
  By following these steps, you should be able to diagnose and resolve the "01821 System cannot be reached" error in SAP.