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SQL2008 R2 on Windows 2008 R2 firewall Question

Posted on 2013-01-16
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Last Modified: 2013-02-04
I have just finished installing a SQL 2008 r2 cluster, no errors all looks well

but when i try and start the SQL managemnt studio (on one of the nodes)

it errors saying
A network related or instance-specific error occurred while establishing a connection to SQL server.
The server was not found or was not accessible. Verify the instance name is correct…..
Error: 26 – Error Locating Server/Instance specified (Microsoft SQL Server)

when i start SQL Managent studio if i add, 1433 to the server name it works.

I dont have to do this on othe rsql clusters in diffrent domains, what have i missed?

config manager shows 1433 as default for the Instance im using

Windows firewall was turned off, tried turning it on and adding  135,1433,1434,2383,4022
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Question by:mhamer
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Ayman Bakr earned 300 total points
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by:Ryan McCauley
Ryan McCauley earned 200 total points
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SQL instances on a cluster require you to specify the instance name, even though it's listening on port 1433 (unless you installed the default instance on your cluster, that is). However, when you specify the instance name, SSMS actually connects to the name/ip you've provided on UDP port 1434 and talks to a service called the SQL Browser - it uses this service to get the port information for the instance you're asking about. That's where it gets tricky - if the port your instance is running on is dynamic, your firewall is going to have trouble because it could change any time you start up SQL Server.

You can obviously work around it by specifying the explicit port, as you've done above (give ",1433" after your instance name) - that's the easiest way around it, since that's working now.
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