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Invalid user after BC upgrade (configurations not modified) [BC20 to BC24]

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Posted on by DavideRota95

Hi all,

i had a BC20 OnPrem envinronment with Windows Authentication that used Kerberos.

I upgraded it to BC24 keeping the same configurations (also for Kerberos) but now i cannot sign in to the web client because BC tell me that my user is an invalid user.

I am sure that the upgrade was succesfull because if i change the authentication method to NavUserPassword i can log in and i can see the migrated data correctly.

With the same configurations in BC20 everything worked correctly. I also tried to delete all users to be able to try to log in and then use the classic "Add me as administrator" on the users page but nothing, I always get the same type of problem.

Do you have any suggestion? Has anything changed from BC20 to BC24 from MS regarding the way delegations are configured?

Many thanks to anyone helps me.

Davide

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Gerardo Rentería Ga... 27,507 Most Valuable Professional on at

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Hi

I hope this can help you

New-NAVServerUser (Microsoft.BusinessCentral.Management) - Dynamics NAV | Microsoft Learn

Add User in Dynamics NAV and Business Central On-premise with Powershell | Dan Kinsella

Best

GR

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DavideRota95 40 on at

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Hi @gdrenteria, thanks for the answer but i also tried before.

i cannot accesso also without any user configured by SQL or Powershell. i obtain the same error.

Only if i change authentication type to NavUserPassword on configurations and set by SQL new specific user i can access but we need to set Windows Authentication

we thinkthat the problem is on kerberos configuration but we cannot dinf the problem. Is something changed from BC20 version?

Thanks Davide

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Ramesh Kumar 7,566 Super User 2026 Season 1 on at

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Hi,

Below suggestion which I seen past

Reconfigure Authentication Settings: Although you have kept the same configurations, it may be worth re-checking or resetting the authentication settings on BC24 and also Check Permissions for the Web Client

Thanks, Ramesh

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YUN ZHU 102,361 Super User 2026 Season 1 on at

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Hi, I'm not sure if it's related, below is a document from Microsoft update last October.

https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/deployment/configure-delegation-web-server?wt.mc_id=DX-MVP-5004336

Thanks

ZHU

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Suresh Kulla 50,280 Super User 2026 Season 1 on at

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I don't there is any change in the Authentication between BC20 and BC24 just make sure if that user has all the permissions to access BC24 and also the license is updated to use BC24, sometime restarting helps

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Khushbu Rajvi. 23,130 Super User 2026 Season 1 on at

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hope this helps as well:https://forum.mibuso.com/discussion/78191/invalid-user-after-bc-upgrade-configurations-not-modified-bc20-to-bc24

https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/upgrade/upgrade-unmodified-application-to-v25

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