2479314 - Internal server error while launching SUM URL in browser.

When you try to launch SUM tool in browser, following error is displayed,

             "Internal Server ErrorOperation  [id=80C16E07F9041ED78F928E2B548FAAA1] terminated with errors : 127 () "

Below trace can be found in sapstartsrv log:

            [Thr 52756] Mon May 22 22:21:21 2017
            [Thr 52756] *** WARNING => Unable to resolve hostname for address 169.254.20.21 [ITSAMProvide 944]
            [Thr 52756] *** ERROR => soap_check_permission authentication: ( , ExecuteOperation ) FAILED [DefaultOpera 163]
            [Thr 52756] *** ERROR => Webmethod ExecuteOperation ( versioninfo ) failed: Unauthorized: User authentication required [saphostcontr 1352]

            [Thr 45900] Mon May 22 22:21:22 2017
            [Thr 45900] *** ERROR => Failed to start command C:\Program Files\SAP\hostctrl\exe\sapdbctrl.exe [OperationCom 620]
            [Thr 45900] *** ERROR => OperationCommand::Execute(): StartCommand failed [OperationCom 200]
           [Thr 45900] *** ERROR => Operation::ExecuteNextCommand(): Execution of command ListDatabases failed
           with errorcode -1 [Operation.cp 357]

 
           [Thr 45900] *** ERROR => Operation [id=80C16E07F9041ED78FDD253A83930AA1]: Command execution failed [Operation.cp 450]
           [Thr 45900] *** ERROR => Webmethod ListDatabases failed: Command execution failed. [saphostcontr 1829]

          [Thr 49132] Mon May 22 22:21:50 2017
          [Thr 49132] HTTPHandlerManager : HTTP Handler found for /lmsl/sumabap/<SID>/doc/sluigui/
          [Thr 49132] *** ERROR => soap_check_permission authentication: ( , ExecutOperation ) FAILED [DefaultOpera 163]

         [Thr 30308] Mon May 22 22:21:58 2017
         [Thr 30308] Updating instance list: Mon May 22 22:21:58 2017
         [Thr 30308]

Also you can see in 'task manager' under services that the 'SAPHostExec' is running under different user than 'LocalSystem'

• Windows NT
• For Unix based environment, refer to SAP Host Agent Troubleshooting Guide for more information.

Internal Server ErrorOperation, Upgrade,SUM URL, soap_check_permission, authentication,sapstartsrv,hostagent,Webmethod,OperationCom 620
, KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , BC-UPG-TLS-TLJ , Upgrade tools for Java , BC-CCM-HAG , Host Agent , Problem