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TCP Provider Run Time Error

Posted on 2013-01-08
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Last Modified: 2013-01-16
screenshot of the Run time error
I have a VB6 app that has been running for 2 years and suddenly out of the blue i got this weird error.   Do you guys have any idea about the runtime error?

The application is made from VB6 with SQL Server 2005 database.

Below is the connection string I am using.
Public Sub Open_Connection()
  Set con = New ADODB.Connection
  With con
    .ConnectionString = "Provider=SQLNCLI;Server=xx.xxx.xxx.xx\instance;Database=myDbase;Uid=admin; Pwd=myPword1234;"
    .CommandTimeout = 0
    .CursorLocation = adUseClient
    .Open
  End With
End Sub

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Any help is greatly appreciated.

-m3mdicl
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Question by:m3mdicl
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Expert Comment

by:TempDBA
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You need to check folllowing two things:-
1. Is your login + password is correct and there exists a valid login in the server.
2. Is the firewall opened.

•Remote OLEDB connection using TCP to a server that is blocked by Firewall
HResult 0x274C, Level 16, State 1
TCP Provider: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

Error: Microsoft SQL Native Client : An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections..
Error: Microsoft SQL Native Client : Login timeout expired.

Ref:- http://blogs.msdn.com/b/sql_protocols/archive/2005/09/28/474698.aspx?PageIndex=11
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Expert Comment

by:shorvath
Comment Utility
You are using an IP address in your connection string.

Has the IP address of this server cahnged? Are you using DHCP?  Can you PING the server using this IP from the client machine that is generating the error?

It is always best to use a named server and let your DNS/Hosts files resolve IP addresses.
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Author Comment

by:m3mdicl
Comment Utility
Hi everyone!!! Thanks for the quick reply.

As I've said the app is running for 2 years with no problem.  
Some additional info.

* The IP address is STATIC.
* The username and password is correct (didn't make any changes)
* The firewall is not blocking the app

Any more suggestions?
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Author Comment

by:m3mdicl
Comment Utility
Hi,
 The ip-address of the connection string has not changed. I can ping the server fine. The firewall is open for the traffic, the sql browser service is running. I can connect using the application from my home office.  I am kind of stumped on why this is happening.  Any ideas?
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Expert Comment

by:shorvath
Comment Utility
Check the Event Viewer to see if there is any more info on why the SQL is rejecting to connection.  (I have had a similar situation caused by a Windows Update.. )  Also check to see if anything has been done to the Server/SQL in terms of changes - new software, updates etc.
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Accepted Solution

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m3mdicl earned 0 total points
Comment Utility
Nothing has been done to the SQL server in terms of updates. What we did was
add xxx.xx.xx.xxx./abc,1433 in the connection string and could get it to work.
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Author Closing Comment

by:m3mdicl
Comment Utility
None of the responses helped.
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