How To Fix UMK621 - HTTP/HTTPS Communication not available

SAP Error Message - Details

• Message type: E = Error

• Message class: UMK - Measures

• Message number: 621

• Message text: HTTP/HTTPS Communication not available

What causes this issue?

HTTP/HTTPS communication is not available. No HTTP/HTTPS plugin service
has been installed on the application server.

System Response

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

How to fix this error?

Contact your system administrator to configure the HTTP/HTTPS plugin
service.

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 UMK621 - HTTP/HTTPS Communication not available ?

  The SAP error message UMK621, which indicates "HTTP/HTTPS Communication not available," typically arises when there are issues with the HTTP or HTTPS communication settings in the SAP system. This can occur in various scenarios, such as when trying to access web services, using the SAP GUI for HTML, or when integrating with external systems.
  Causes:
  
  Network Issues: There may be network connectivity problems between the SAP system and the client or external systems.
  Service Not Running: The HTTP or HTTPS service may not be running on the SAP application server.
  Incorrect Configuration: The HTTP/HTTPS settings in the SAP system may be misconfigured.
  Firewall Restrictions: Firewalls or security settings may be blocking the HTTP/HTTPS traffic.
  SSL Configuration Issues: If using HTTPS, there may be issues with the SSL certificates or configuration.
  SAP Kernel Issues: The SAP kernel may be outdated or not properly configured to handle HTTP/HTTPS requests.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the network connection is stable and that there are no issues with routing or DNS resolution.
  Verify Service Status: Check if the HTTP/HTTPS service is active. You can do this by using transaction code SICF in the SAP GUI to check the status of the services.
  Review Configuration: 
  
  Go to transaction SICF and ensure that the relevant services are activated.
  Check the HTTP/HTTPS settings in transaction RZ10 (for profile parameters) and RZ11 (for dynamic parameters).
  
  
  Firewall Settings: Ensure that the firewall settings allow traffic on the required ports (usually port 80 for HTTP and port 443 for HTTPS).
  SSL Configuration: If using HTTPS, verify that the SSL certificates are correctly installed and configured. You can check this in transaction STRUST.
  Update SAP Kernel: Ensure that the SAP kernel is up to date. You can check for updates and apply them if necessary.
  Check Logs: Review the SAP system logs (transaction SM21) and the HTTP trace (transaction SICF -> "Trace") for any additional error messages that may provide more context.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to UMK621 for any specific patches or updates that may address this issue.
  Documentation: Refer to the official SAP documentation for configuring HTTP/HTTPS services.
  Community Forums: SAP Community and other forums can be helpful for finding similar issues and solutions shared by other users.
  
  If the problem persists after trying the above solutions, it may be beneficial to engage SAP support for further assistance.