How To Fix SCWN811 - Could not open HTTP for &1: &2

SAP Error Message - Details

• Message type: E = Error

• Message class: SCWN - Messages Note installation and management

• Message number: 811

• Message text: Could not open HTTP for &1: &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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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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SCWN811 - Could not open HTTP for &1: &2 ?

  The SAP error message SCWN811, which states "Could not open HTTP for &1: &2," typically indicates an issue with the HTTP connection to a specified service or resource. The placeholders &1 and &2 usually represent the specific service or resource that the system is trying to access and the error details, respectively.
  Causes:
  
  Network Issues: There may be network connectivity problems preventing the SAP system from reaching the specified HTTP service.
  Incorrect URL: The URL or endpoint being accessed may be incorrect or malformed.
  Service Unavailability: The target HTTP service may be down or not responding.
  Firewall/Proxy Issues: Firewalls or proxy settings may be blocking the HTTP request.
  SSL/TLS Issues: If the connection is over HTTPS, there may be issues with SSL certificates or TLS settings.
  Authorization Issues: The user or service account may not have the necessary permissions to access the HTTP resource.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the SAP system can reach the target service. You can use tools like ping or telnet to test connectivity.
  Verify URL: Double-check the URL being used in the configuration to ensure it is correct.
  Service Status: Check if the target HTTP service is up and running. You can try accessing the URL directly from a web browser or using tools like curl.
  Firewall/Proxy Configuration: Review firewall and proxy settings to ensure that they allow traffic to the target service.
  SSL/TLS Configuration: If using HTTPS, ensure that the SSL certificates are valid and properly configured in the SAP system.
  Authorization Check: Verify that the user or service account has the necessary permissions to access the HTTP resource.
  
  Related Information:
  
  Transaction Codes: You may want to check transaction codes like SICF (HTTP Service Hierarchy) to manage and configure HTTP services in SAP.
  Logs: Check the SAP application logs (transaction SLG1) for more detailed error messages that can provide additional context.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to SCWN811.
  Documentation: Review SAP documentation related to HTTP connections and web services for best practices and troubleshooting steps.
  
  If the issue persists after trying the above solutions, consider reaching out to your SAP Basis team or SAP support for further assistance.