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Can't connect SQL2008 when firewall sbs2011 is active

Posted on 2011-09-16
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Last Modified: 2012-05-12
I’m using  a Windows SBS2001 with SQL express 2008r2.

When a client tries to connect the SQL server it doesn’t work. The connection is probably blocked by the SBS2001 firewall. If I turn the firewall off, then the client can connect to the SQL database.

I tried many thing, but they didn’t help.

-      Allow incoming tcp port 1433 in the server firewall
-      In the SQL server configuration manager under “Protocols for SQL Express “
I configured the tcpip protocol: tcp port: 1433, dynamic port – (and also tried different combinations)

So basically, when I turn off the server 2011 firewall, I can connect to the SQL database. But I want to make it work when firewall’s active.


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Question by:sitpro
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setasoujiro earned 500 total points
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Expert Comment

by:Haris Djulic
ID: 36552117
add  exception programs to server firewalls since the SQL server and Sql browser will sometimes use dynamic ports with this way you will cover all dynamic ports since you are allowing the program to pass throu the firewall.


From my experience you need to add the SQL server and Sql Server Browser

Take a look here

http://blog.sqlauthority.com/2007/04/23/sql-server-fix-error-40-could-not-open-a-connection-to-sql-server/

http://blog.sqlauthority.com/2008/08/09/sql-server-fix-error-1326-cannot-connect-to-database-server-error-40-could-not-open-a-connection-to-sql-server/ 
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Author Closing Comment

by:sitpro
ID: 36554305
You have to add ALL below ports in the Windows firewall to make it work.

Type in the searchbox firewall and select Windows Firewall with advanced security. Go to Inbound Rules and add the ports one by one:

New Rule > TCP > Specific Local Ports > Next > Domain > Next > Finish

Use these TCP Port:
 135 – Transact SQL Debugger
 1433 – SQL Traffic
 2383 – SQL Analytics Traffic
 4022 – SQL Broker Traffic

Use these UDP Port:
1434 – SQL Browser Traffic
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