When I go to SAP Management Console, the tree is not appearing ; and i cannot start the console from yesterday. So I went to "Run" services.msc option to check the SAP program files appear there or not. I checked there, the two sap files "SAPC11_00" and SAPOSCOL" are appearing there but not started. If i double click this for making it started, it gives the following message. "THE SERVICE DID NOT START DUE TO LOGON FAILURE" Can anybody suggest any solution to solve this problem. Awaiting for the reply . Please.