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SQL Server Express 2005, TELNET, and Port 1433

Posted on 2008-06-14
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I was configuring a client yesterday for a SQL Server 2005 Express DB.  Before building the ODBC connect string, I ran ping <IP Address>; the server replied.  I then ran TELNET <IP Adress> 1433 (1433 being the SQL over TCP port number).  I received the following response: "Connecting To <IP Address>...Could not open connection to the host, on port 1433:"  Here's the weird part, I tried the ODBC connect string, and it worked.  I double-checked, the host name specified in the ODBC connect string does match the IP address.  Up until yesterday, I'd assumed that port 1433 had to be open on the SQL server for a client / server connection to be successful.  Am I wrong.  Or, is my understanding of TELNET as a "port pinger" flawed.  
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Question by:jdana
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by:Guy Hengel [angelIII / a3]
ID: 21784885
port 1433 is the default, but your sql instance installed might have been configured to use another port...
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by:jdana
ID: 21784910
I installed the instance of SQL Server 2005 on the server.  I used the default install settings.
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by:osiara
ID: 21784936
Do you have enabled TCP/IP Protocol ??
(SQL Server Configuration Manager -> Network configuration)
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by:jdana
ID: 21784954
Yeah, recall that that the ODBC connect string DOES work.  I have full access to the SQL Server from the client machine.  The only thing I can't do from the client machine is TELNET the server on port 1433.  
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by:Guy Hengel [angelIII / a3]
ID: 21785218
the question of osiara was to clarify if the TCP/IP protocol is enabled.
if it's not, you can still connect via named pipes protocol, for example, which would explain why the telnet does not work.
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by:jdana
ID: 21785311
Angel III,

Good point.  Shared Memory and TCP/IP are enabled.  Named pipes and VIA are not.  
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by:Guy Hengel [angelIII / a3]
ID: 21785333
huh, spooooky :)

maybe your local firewall blocked your telnet application as such ?
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by:jdana
ID: 21785342
I wish that was it.  Windows Firewall is off.  There are no other firewall apps on the machine.  
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by:Guy Hengel [angelIII / a3]
ID: 21785420
can you show the sql network utility, to see the configuration of the tcp/ip protocol?
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by:jdana
ID: 21785432
The SQL Server Configuration Manager?  Surface Area Configuration?  Something else?
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Guy Hengel [angelIII / a3] earned 250 total points
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by:jdana
ID: 31467178
angelIII,

Sorry for the slow response.  I appreciate the follow through.

J
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