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Update for synchronization with Exchange servers - NTLMv1 to NTLMv2

In order to synchronize the appointments with current Exchange servers, the following update would be necessary:

"NTLMv1 disabled for security reasons. If the developers of the app support NTLMv2, it should work again."

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5 replies

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A

Have the same problem. Our exchange provider switched from NTLMv1 to NTLMv2 a few weeks ago. Since then, I have no longer been able to synchronise my appointments.

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EM

Hello, I am having issues adding an Exchange account on Android. The error message is 401 unauthorized which lead me to https://support.onecalendar.nl/i1413-401-unauthorized-when-exchange-server-ntlmminclientsec-is-set-to-128bit-0x20000000

But it might also be related to the requirement of NTLMv2 for Exchange Extended Protection which is enabled by default since Exchange 2019 CU14.

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MS
1

@Megan do you have the same problem?

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MB

Yes, I do. Just started for me about a week ago, but only realized it today after scheduling some meetings over other meetings.

MB

I can't imagine we are the only two ...

MS

Does your company also use an Exchange Server?

MB

Yes, to the best of my knowledge, we use an exchange server.

MB

Actually, we use Office 365, and I don't think that's an Exchange Server. I was mistaken.

MS
1

Unfortunately I don't know, I haven't received an answer from the development team yet

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MB

Thanks for the quick reply, Martin. 

MB

Anyone know if this is being worked on? Thanks!

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