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Cannot connect to SQL server using MS SQL Server management studio express

I have installed SQLserver 2005 express on my win xp sp3 32 bit.

Everything was working fine and i was able to login to my server (VIRTUALXP\SQLEXPRESS) using windows authentication. Suddenly I started getting this problem:

Cannot connect to VIRTUALXP\SQLEXPRESS

Additional information

A network-related or instance-specific error occured while establishing a connection to SQL Server. The Server was not found or was not accessible. Verify that instance name is correct and that SQL Server is configured to allow remote connections. (Provider : SQL Network INterfaces, error:26 - Error locating server/Instance specified)(Microsoft SQL Server)
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gs79
Asked:
gs79
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1 Solution
 
gs79Author Commented:
How to resolve this. My SQL Server is running and I have added sqlserver.exe to my firewall exceptions..This is crazy..please help me get throuh this..

Thanks,
GS
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gs79Author Commented:
I have enabled the local and network connections in the SQL 2k5 surface area configeration  and also I have added  UDP port 1434  in the firewall exception
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adamsjsCommented:
You state that you have added firewall exceptions. Is this Windows Firewall, and is it on the SQL Server host?

Are you able to connect to the SQL Server instance if you disable Windows Firewall?

What changes, if any, were made to the SQL Server host between the time you were able to connect and the time you began experiencing this issue?

Have you looked at this article, which discusses configuring Windows Firewall to allow connections to a SQL Server instance?:  http://technet.microsoft.com/en-us/library/cc646023.aspx  (Note:  There are additional links you can follow from this article with detailed steps for configuring Windows Firewall).
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gs79Author Commented:
Thank you for your response..

The sql server is installed on a virual windows xp 32 bit.

 I disabled the firewall and I still have the same problem. I will disable it for now as i am using this machine solely for sql server practice

I think when it was working, I had logged in with my network login and was setting a new user (acme_user). After playing with this login i am not able to login either with my network authentication or sql server authentication..

Please help..

Thanks,
GS
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gs79Author Commented:
Hurray! SQL Server browser had stopped running. Starting this service let me in..

Thanks
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