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Editorial Team
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Asked: 2026-05-20T22:32:01+00:00

The following exception is returned to our code during the following: m_cnn = new

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The following exception is returned to our code during the following:

m_cnn = new SqlConnection();
m_cnn.ConnectionString = sxCnn;
m_cnn.Open();

—EXCEPTION INFORMATION—

Exception: in OpenEx. 
Msg=OpenEx failed. 
Errors: Index #0
Message: Login failed for user 'xyz'.
LineNumber: 65536
Source: .Net SqlClient Data Provider
Procedure: 
Number: 18456
State: 1

The problem I am having is that I cannot find this entry in the SQL error logs in order to look-up the state. For instance, we saw this exception at 11:43am today and when I go to the logs, there is no entry for that time.

Is there something that we need to do in order to enable this logging? We have the ‘Failed logins only’ option selected in the database properties under Security | Login auditing. Yet, we see nothing in there for this issue.

Any help is much appreciated.

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1 Answer

  1. Editorial Team

    This issue was occurring because of two main issues:

    1. A few switches on our network were bad
    2. We are making an obscene amount of concurrent connections to the database

    We have fixed 1 and the number of issues has drastically reduced. We are in the process of rewriting the connections made from apps (I actually asked another question while trying to implement a fix here)

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