How To Fix 01821 - System cannot be reached

01821 - Overview

• 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