Big change is probably the OS Win 2003 -> Win 2012 (change of SQL Server may have compatibility issues but they are more likely to show after connect because error you are getting is saying it ca't connect so at that point the application won't even know what server version it is.
My guess is it may be something simple like the Win 2012 firewall blocking connections or the protocol not enabled on with new SQL server - make sure you can connect to the new server and db from chosen client with ISQL using the same credentials etc.
James Horsley
Workflow Consulting Limited
I have turned off windows firewall on the machine that is Windows 2012 and host SQL2012 that I am trying to access it but still same error 'The connection cannot be used to perform this operation. It is either closed or invalid in this context'.
You mentioned other protocol may need to be enabled on SQL2012. Can you be more specific so I can try that as well.
Are you able to connect using ISQL or equivalent from the same client machine? As for protocol make sure TCP/IP is enabled in the SQL Server configuration manager, server network configuration
James Horsley
Workflow Consulting Limited
Now is working and not getting error. I restarted this document management application and is working. However now even after enabling firewall is working so need to see more what is happening but looks that I am close. Thanks all for your help
You might see something in the event logs (esp Application & Security logs) on the SQL server that hints at why it failed ... as for restart of firewall did you exit the doc management application and restart after reenabling the firewall? If not it may be that it blocked the new connection but did not block existing connections
James Horsley
Workflow Consulting Limited
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