How To Fix SRT_WSP2180 - Reverse Proxy "&1" has an invalid incoming http header host name "&2"

SAP Error Message - Details

• Message type: E = Error

• Message class: SRT_WSP2 - Messages for SRT WSP

• Message number: 180

• Message text: Reverse Proxy "&1" has an invalid incoming http header host name "&2"

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SRT_WSP2180 - Reverse Proxy "&1" has an invalid incoming http header host name "&2" ?

  The SAP error message SRT_WSP2180 indicates that there is an issue with the incoming HTTP header's host name when using a reverse proxy. This error typically occurs in scenarios where SAP systems are configured to work with a reverse proxy server, which forwards requests to the SAP application server.
  Cause:
  The error message can be caused by several factors, including:
  
  
  Invalid Host Header: The incoming request to the SAP system has a Host header that does not match the expected hostname configured in the SAP system or the reverse proxy.
  
  
  Misconfiguration of Reverse Proxy: The reverse proxy may not be correctly configured to forward the Host header or may be forwarding an incorrect value.
  
  
  DNS Issues: There may be DNS resolution issues where the hostname in the request does not resolve correctly to the expected IP address.
  
  
  SSL/TLS Configuration: If SSL/TLS is involved, there may be issues with the certificates or the way the reverse proxy handles secure connections.
  
  
  Solution:
  To resolve the SRT_WSP2180 error, you can take the following steps:
  
  
  Check Host Header: Verify that the Host header in the incoming request matches the expected hostname configured in the SAP system. You can use tools like curl or browser developer tools to inspect the headers.
  
  
  Configure Reverse Proxy: Ensure that the reverse proxy is correctly configured to forward the Host header. This may involve checking the configuration files of the reverse proxy (e.g., Apache, Nginx, etc.) to ensure that the correct headers are being passed.
  
  
  Update SAP Configuration: In the SAP system, check the configuration settings related to the HTTP/S settings. Ensure that the expected hostname is correctly set in the SAP Web Dispatcher or the relevant SAP application server settings.
  
  
  DNS Resolution: Ensure that the hostname resolves correctly to the expected IP address. You can use commands like nslookup or ping to verify DNS resolution.
  
  
  Check SSL/TLS Settings: If SSL/TLS is being used, ensure that the certificates are correctly configured and that the reverse proxy is set up to handle secure connections properly.
  
  
  Logs and Traces: Check the logs of both the SAP system and the reverse proxy for any additional error messages or warnings that could provide more context about the issue.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to reverse proxy configurations and the specific error message for any updates or patches that may address the issue.
  Documentation: Review the documentation for the specific reverse proxy you are using (e.g., Apache, Nginx) for best practices on handling headers and SSL configurations.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify and resolve the cause of the SRT_WSP2180 error in your SAP environment.