Outlook 2010 disconnected from exchange 2010


Random users outlook got disconnected in our Exchange 2010 environment.

Any help will be highly appreciated !!!
Srinivasan AsokanAsked:
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Online or Cached mode?
Srinivasan AsokanAuthor Commented:
Hi Thierry,

All users are connected on cached mode.
MASEE Solution Guide - Technical Dept HeadCommented:
Is this happening to all or specific user?
If yes please reconfigure that user.
Is this happening to all users in all databases or specific database?
if yes please create a new database move all users to it.
Is this happening to users internal network only or external as well?
If only internal please try with outlookanywhere by ticking both check box below in outlook.

Please show me the result of Get-OutlookAnywhere | fl IISAuthenticationMethods
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Srinivasan AsokanAuthor Commented:
Hi Thanks for your inputs,

The issue is happening to random users and not DB specific.

The issue is happening to internal users. Please find the below details for your reference.

{Basic, Ntlm}
{Basic, Ntlm}

Thanks !!!
MASEE Solution Guide - Technical Dept HeadCommented:
Did you test with outlook anywhere?
Please test with outlookanywhere as well.
How many servers you have? Check the server detailis
Get-OutlookAnywhere | fl IISAuthenticationMethods,identity
Srinivasan AsokanAuthor Commented:

We are having 10 exchange servers(6 Exchange 2016 servers and 4 exchange 2010 servers)

EX2016Server-01 - Basic,Ntlm
EX2016Server-02 - Basic,Ntlm
EX2016Server-03 - Ntlm
EX2016Server-04 - Ntlm
EX2016Server-05 - Ntlm
EX2016Server-06 - Ntlm
EX2010Server-01 - Ntlm
EX2010Server-02 - Ntlm
EX2010Server-03 - Basic
Ex2010Server-04 - Basic

Thanks !!!
MASEE Solution Guide - Technical Dept HeadCommented:
Where is your autodiscover and common name pointing to?
Do you know there is a protocol difference in Exchange 2010 and 2016?

For testing create an host entry common name ponting to Exchange 2010 and check outlook is disconnecting or no?

Your Exchange2010 mailbox will continue connect to Exchange 2010 RPC Client Access array endpoint from internal network.
Please read this for more information.

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What's the patch status of the Exchange 2010? in order to coexist with 2016 all servers in the environment need to be at SP3 and RU11 at least.

All connection end-points for client connectivity needs to point to Exchange 2016 ideally.
Annie RoseTech LeadCommented:
Check your exchange services?

Do you use Outlook Anywhere?

Go into account settings, see the name of the Exchange server, is it DNS?  Is DNS working?

Restart the "Microsoft Exchange System Attendant" and "Microsoft Exchange RPC Client Access" services.

Ajit SinghCommented:
Have tried the above suggestions?
MASEE Solution Guide - Technical Dept HeadCommented:
Thanks for updating us.
This is what i explained above with a reference article.
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