Ado Sql Authentication Connections Affected By Loss Of Domain Controller

Jul 20, 2005

I have observed that a temporary loss of a domain controller can cause
problems creating new ado connections between a client machine running
ado and a separate sql server machine that are members of the domain.
I understand why this happens when creating connections with windows
authentication. What is a mystery is that it also sometimes effects
new connections that use "sql authentication". Below is a description
of my test scenario.

a. Setup 3 machines.
i. one domain controller machine. windows 2000 based. I have tried
both a regular domain setup and a domain setup in compatibility mode.
ii. one sql server machine that is a member of the domain. windows
2000.
iii. one client machine running an ado test program that communicates
with the sql server machine. I have tried both 2000 and xp.

b. Start your test ado program and create a connection.
c. Fire a query.
d. It should work.
e. Unplug the network cord on the domain controller.
f. Create a new connection and fire a new connection about a minute or
so after.
g. It should work. Apparently the client caches account information
from the domain controller for a certain amount of time. The time
seems to be shorter by default in xp than 2000.
h. Wait 20 minutes or more.
i. Create another new connection. You will notice a timeout error.
If your using windows authentication the timeout will happen 100% of
the time. That is to be expected. If your using sql authentication
the timeout seems to happen about 50% of the time. I can't explain it
other than some strange Microsoft bug. I speculate that it may be
some bug with the way ado caches connections. Perhaps a previously
setup windows authentication connection gets reused by a request for a
sql authentication connection. However I haven't been able to prove
it.

Any insight you can offer would be appreciated. I also have a test
program you can use to reproduce this behavior if you are interested.

Thanks,
Frank

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[UnauthorizedAccessException: Access to the path 'C:Program FilesMicrosoft SQL ServerMSSQL.2Reporting ServicesReportManagerin' is denied.]
System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) +2014163
System.IO.Directory.InternalGetFileDirectoryNames(String path, String userPathOriginal, String searchPattern, Boolean includeFiles, Boolean includeDirs, SearchOption searchOption) +1817
System.IO.Directory.GetDirectories(String path, String searchPattern, SearchOption searchOption) +36
Microsoft.ReportingServices.Diagnostics.Localization.GetInstalledCultures() +112
Microsoft.ReportingServices.Diagnostics.Localization..cctor() +66

[TypeInitializationException: The type initializer for 'Microsoft.ReportingServices.Diagnostics.Localization' threw an exception.]
Microsoft.ReportingServices.Diagnostics.Localization.SetCultureFromPriorityList(String[] localeList) +0
Microsoft.ReportingServices.UI.GlobalApp.Application_BeginRequest(Object sender, EventArgs e) +157
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +92
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64





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