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ActiveSync 1008 disconnecting clients

I have an Exchange 2010 server which keeps disconnecting all users, and so far the workaround is to restart the Information Store.  When reviewing the event logs, they show multiple 1008 events:

"Exchange ActiveSync has encountered repeated failures when it tries to access data on Mailbox server [server]. It will temporarily stop making requests to the Mailbox server for [60] seconds to reduce load on that server. This delay may occur if the Mailbox server is overloaded. If this event is logged frequently, review the Application log on this server and the Mailbox server noted above for other events that could indicate the root cause of performance problems.

URL=/Microsoft-Server-ActiveSync/default.eas?User=username&DeviceId=O78RE289C17PH6P0TAAE177HOS&DeviceType=iPhone&Cmd=Ping"


Also seeing 1006 events:

Log Name:      Application
Source:        MSExchange Mailbox Replication
Date:          04/02/2018 09:39:06
Event ID:      1006
Task Category: Service
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      server
Description:
The Microsoft Exchange Mailbox Replication service was unable to process jobs in a mailbox database.
Database: Mailbox Database 1234072321
Error: MapiExceptionCallFailed: Unable to make connection to the server. (hr=0x80004005, ec=5)


These clear after the Information Store is restarted.  The application log is so full of the 1008 errors prior to the restart, that there are no other events to help identify causation.

Any ideas as to what could be causing this?
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Peter Venkman
Asked:
Peter Venkman
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3 Solutions
 
Justin EvansCommented:
I don't know what is causing this,  but Microsoft have released a update rollup to stop it happening.

Fixed in Update Rollup 11: https://support.microsoft.com/en-us/kb/3078674

Try applying that hotfix and see if the problem still occurs.
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Peter VenkmanAuthor Commented:
The Exchange server is already on Update Rollup 19
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Todd NelsonSystems EngineerCommented:
The quoted text you provided doesn't match the expected Event ID 1008 text in Exchange 2010.

"An exception occurred and was handled by Exchange ActiveSync. This may have been caused by an outdated or corrupted Exchange ActiveSync device partnership. This can occur if a user tries to modify the same item from multiple computers. If this is the case, Exchange ActiveSync will re-create the partnership with the device. Items will be updated at the next synchronization. URL=%1%2."

Will you please verify?

Also, review these references...

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Peter VenkmanAuthor Commented:
I've checked the error and it was event 1008 (see below)

Log Name:      Application
Source:        MSExchange ActiveSync
Date:          04/02/2018 09:32:19
Event ID:      1008
Task Category: Requests
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      server
Description:
An exception occurred and was handled by Exchange ActiveSync. This may have been caused by an outdated or corrupted Exchange ActiveSync device partnership. This can occur if a user tries to modify the same item from multiple computers. If this is the case, Exchange ActiveSync will re-create the partnership with the device. Items will be updated at the next synchronization.

- I've reviewed all the articles you have provided and I'm starting to think that these events are a symptom of the issue rather than the cause.  Because it wasn't just ActiveSync users which couldn't connect, it was all users, and a restart of the Information Store resolved the issue.
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Todd NelsonSystems EngineerCommented:
Good.  Glad to hear the articles I provided guided you to a resolution.
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Peter VenkmanAuthor Commented:
I haven't found a resolution ... I just don't think the Active Sync errors are the issue.  If you have any ideas of what could cause mailboxes to disconnect until Information Store is restarted, suggestions are welcomed.
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Todd NelsonSystems EngineerCommented:
Is the issue occurring for every user or only a specific group of users?

Also, take a look at this reference ... https://eightwone.com/2011/08/31/exchange-activesync-and-inheritable-permissions-issue/
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Peter VenkmanAuthor Commented:
All users, including Outlook users.  I've come across the inheritable permissions issue before, but I didn't think that issue would be resolved by a restart of Information Store?
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Todd NelsonSystems EngineerCommented:
Sufficient information provided for resolution.
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