"Could not connect to the ConfigMgr site database" problem with SCCM

Question

The scenario is:
- SCCM 2007 SP1 installed on one server
- SQL 2008 installed on the other server
- Console was also installed on the SCCM server.
Everything was working just fine for about three months. As of few days ago, out of nowhere, I cannot open the console at all, it gives me this error:
" The ConfigMgr console could not connect to the ConfigMgr site database. Verify that this computer has network connectivity to the SMS Provider computer and that your user account has Remote Activation permissions on both
the ConfigMgr site server and SMS Provider computers. For more information, see "How to Configure DCOM Permissions for Configuration Manager Console Connections" in ConfigMgr Help. "
I confirmed all permissions (DCOM) and group settings (SMS Admin) and everything looks fine. I also noticed one other thing and I have a feeling its related - I log on to SCCM server and then from there I try to start RDP
connection to SQL server. I can connect, but as soon as I move the mouse or try clicking somewhere it breaks the connection and the "Trying to re-connect" window appears. It can`t establish normal RDP connection. If I try from any other server to SQL, it works
fine...
Any suggestions will be appreciated.
Dino

Answer 1

looks like I celebrated way too early - after working for about 20 minutes, it started throwing the same error again. Th adminUI log has this entry:
===========================================================================================================0
[3][13.4.2011 13:33:45] :Error returned from WMI Query Engine\r\nMicrosoft.ConfigurationManagement.ManagementProvider.WqlQueryEngine.WqlQueryException\r\nThe ConfigMgr Provider reported an error connecting to the ConfigMgr site database server. Verify
that the SQL Server is online and that ConfigMgr site server computer account is an administrator on the ConfigMgr site database server.\r\n   at Microsoft.ConfigurationManagement.ManagementProvider.WqlQueryEngine.WqlQueryResultsObject.<GetEnumerator>d__0.MoveNext()
   at Microsoft.ConfigurationManagement.ManagementProvider.WqlQueryEngine.WqlQueryProcessor.ProcessQueryWorker(AsyncOperationDatabase asyncData)
   at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.AsyncProcessMessage(IMessage msg, IMessageSink replySink)\r\nConfigMgr Error Object:
instance of SMS_ExtendedStatus
    CauseInfo = "";
    Description = "Unable to get SQL connection.";
    ErrorCode = 3242263810;
    File = "e:\\nts_sms_fre\\sms\\siteserver\\sdk_provider\\smsprov\\sspobjectquery.cpp";
    Line = 1861;
    Operation = "ExecQuery";
    ParameterInfo = "select * from SMS_ConfigurationBaselineInfo where UPPER(CI_UniqueID) NOT IN (SELECT UPPER(InstanceKey) FROM SMS_ObjectContainerItem WHERE ObjectType=2011) ORDER BY LocalizedDisplayName";
    ProviderName = "WinMgmt";
    SQLMessage = "[08S01][11][Microsoft][ODBC SQL Server Driver][DBNETLIB]General network error. Check your network documentation.";
    SQLSeverity = 0;
    SQLStatus = 11;
    StatusCode = 2147749889;
Unable to get SQL connection.
\r\nSystem.Management.ManagementException\r\nGeneric failure \r\n   at System.Management.ManagementException.ThrowWithExtendedInfo(ManagementStatus errorCode)
   at System.Management.ManagementObjectCollection.ManagementObjectEnumerator.MoveNext()
   at Microsoft.ConfigurationManagement.ManagementProvider.WqlQueryEngine.WqlQueryResultsObject.<GetEnumerator>d__0.MoveNext()\r\nManagementException details:
instance of SMS_ExtendedStatus
    CauseInfo = "";
    Description = "Unable to get SQL connection.";
    ErrorCode = 3242263810;
    File = "e:\\nts_sms_fre\\sms\\siteserver\\sdk_provider\\smsprov\\sspobjectquery.cpp";
    Line = 1861;
    Operation = "ExecQuery";
    ParameterInfo = "select * from SMS_ConfigurationBaselineInfo where UPPER(CI_UniqueID) NOT IN (SELECT UPPER(InstanceKey) FROM SMS_ObjectContainerItem WHERE ObjectType=2011) ORDER BY LocalizedDisplayName";
    ProviderName = "WinMgmt";
    SQLMessage = "[08S01][11][Microsoft][ODBC SQL Server Driver][DBNETLIB]General network error. Check your network documentation.";
    SQLSeverity = 0;
    SQLStatus = 11;
    StatusCode = 2147749889;
\r\n
====================================================================================================
As I mentioned in my first post, the RDP from SCCM to SQL servers is not working and I think that is related to my problem....suggestions?