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SQL Server does not exist or access denied

Posted on 2006-11-13
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Last Modified: 2012-05-05
I am stumped on this problem. I cannot get my application to connect to the local SQL Server.  

The application was written in VB6 and I am using mixed mode. I also have the MS firewall turned off. I am using the ADO and it works fine on my old developer computer but not the new one. I cannot even connect to the SQL Server on my old developer computer from the new computer. It is got to be something on the new computer, maybe I forget to install something. EM and ODBC connects to the SQL Server just fine on the new computer using the mixed mode.

What am I missing?





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Question by:lunchbyte
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Expert Comment

by:Nightman
ID: 17931769
Post your connetion string here
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Expert Comment

by:Nightman
ID: 17931778
Sorry, I know it sounds like an 'Is it plugged in' question, but I always like to check the basics first.
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Author Comment

by:lunchbyte
ID: 17931793
Driver={SQL Server};Server=Dianelapm90,1433;Database=nkdata;Uid=nk_user;Pwd=XXXX;

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Expert Comment

by:Nightman
ID: 17931844
Version of MDAC?
Any other software (such as Zone Alarm)?
Can you ping the other server?
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Author Comment

by:lunchbyte
ID: 17931849
Driver={SQL Server};Server=172.0.0.1,1433;Database=nkdata;Uid=nk_user;Pwd=XXXX;

did not work as well
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Author Comment

by:lunchbyte
ID: 17931865
I mean 127.0.0.1 did not work as well.
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Author Comment

by:lunchbyte
ID: 17931893
how do you ping a port? I can ping the localhost and the other computer just fine.
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Expert Comment

by:Nightman
ID: 17931901
SQL Server version?
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Author Comment

by:lunchbyte
ID: 17931924
8.00.194
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Expert Comment

by:Nightman
ID: 17931928
can you telnet onto the port?
start-->run-->cmd
telnet Dianelapm90 1433
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Author Comment

by:lunchbyte
ID: 17931951
it says could not open connection to the host, on port 1433. connect failed.
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Expert Comment

by:Nightman
ID: 17932337
Sorry - had to step away. If that is the case, SQL Server is not running on port 1433 - check that you have enabled TCP on the server and that named pipes is enabled (right click in EM, properties, Network Configuration).

To confirm whether it is actually access denied, you could run a SQL Profiler trace and view the attempted connections. If you see traffic in the trace in profiler, then you know that at least the connection is getting to SQL Server and then being rejected.
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Author Comment

by:lunchbyte
ID: 17932436
Both TCP and named pipes are enabled. Nothing shows up on profile when I try to connect using the VB6 application. The port is set to 1433.
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Expert Comment

by:Nightman
ID: 17932554
So it's being blocked before it connects to SQL, or can't find the server. Are you sure of the SQL instance name? Definitely Dianelapm90and not Dianelapm90\INSTANCENAME
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Author Comment

by:lunchbyte
ID: 17932563
OK, I got it to work by doing this.

Driver={SQL Server};Server=DIANELAPM90;Database=nkdata;Uid=nk_user;Pwd=XXXX;


,1433 was removed from the connection string. Any idea why? I got the firewall turned off.
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Expert Comment

by:Nightman
ID: 17932581
Is your SQL Server installed with a binary or case sensitive collation setting?
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Author Comment

by:lunchbyte
ID: 17932607
I am not aware of that but under General tab I see "SQL_Latin1_General_CPS_CI_AS" for Server collation:

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Assisted Solution

by:Dany Balian
Dany Balian earned 50 total points
ID: 17932615
first of all, are you sure that u installed sql server as a default instance?? or a new instance?

if it's the default instance, and still u cannot connect to it, then this reminds me of a problem that occured once on my windows xp professional sp2 machine...
i searched everywhere for a solution, and found nothing..

i dont know if this is an option in your case...
but i uninstalled sql server and reinstalled it, and everything worked perfectly...

p.s. the computer is able to connect to a remove sql server successfully but not to the local... and reinstalling (repairing) sql server did not solve the problem!!

hope this helps,

cheers,

dan
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Accepted Solution

by:
Nightman earned 400 total points
ID: 17932666
The collation is general, not case sensitive. Perhaps you are not actually running on TCP, or perhaps it is being blocked. Most likely, removing the 1433 allowed it to connect on Named Pipes.

Suggest you check the SQL Server logs to see if there were any errors trying to listen on that port. You could also run TCP View from www.sysinternals.com to see what is running on which port on the PC.
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Author Comment

by:lunchbyte
ID: 17932825
Using TCP View, 1433 is not on the list.
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Author Comment

by:lunchbyte
ID: 17932831
mrdany - I am using the default instance. I will try to uninstall and reinstall as last resort.
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Expert Comment

by:Nightman
ID: 17932860
If 1433 is not in the list, then SQL Server is not actually listening on that port. Restart SQL Server, and then look at the SQL Server logs (from EM) - you will see the TCP Port it is listening on (or trying to, and any error) in there after startup.
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Author Comment

by:lunchbyte
ID: 17932944
Fixed. I installed SP3 for SQL Server and rebooted the computer and now I can connect.
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Assisted Solution

by:jkaios
jkaios earned 50 total points
ID: 17933969
By the way, the latest version of SQL 2000 is SP4 and can be downloaded from Microsoft.com
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