Ever came across this error?
There can be multiple reasons for QuickBooks to generate this error. Digging down the error this time I found something completely different, new culprit which was causing the problem.
In this particular case it was Quickbooks Premier 2017 on a multi-user environment with QBW files on the server ( Server 2008) with QB Database Server Manager running and 3 computers (two with windows 10 and one with windows 8)
The situation was when a user closes out of QuickBooks and when they try to log back into the same company file again they get the error “The attempt to log in with username “username” failed. The user is already logged into the company file. If possible try logging in using a different username.” Restarting the Server or the QB Database Server Manager allows them to log back in but this happens each time a user logs into a company file and we can’t just restart the server all the time.
I did all the basic troubleshooting steps like killing the qbw32 process from the task manager but did not help. The file was clean as no errors were detected while verifying the file. Still went ahead and ran a repair but the problem persists, Thinking it could be a problem with the user list as at times it gets damaged I deleted all the users and created new one but that didn’t help either.
Further digging down found that QuickBooks messenger was causing the problem though the QuickBooks messenger option was disabled on all three workstations.
Finally the FIX for “The user is already logged into the company file. If possible try logging in using a different username”
Browse to C:\Programs Files (x86)\Intuit\QuickBooks 2017″ folder. and rename QuickBooksMessaging.exe to QuickBooksMessaging.exe.old.
Did that on all three workstations and haven’t seen that frustrating error since then..
Hope this helps if you are experiencing a very similar issue