I have the same issue. This link is broken or the app doesn't exist anymore.
https://splunkbase.splunk.com/app/1908/
Did you find a suitable work around?
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Integrated authentication is still an issue. Either the documentation misses a few steps or db connect is using the driver incorrectly.
Best work around is to disable windows authentication, create a sql server username and password on the DB, use the MS-Generic Driver (without Windows Auth), and send the username and password in the query.
Side note for username: I believe the username still must include the domain. Ex. (MyDomain\Username)
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