![]() Set-ThrottlingPolicy RCAMaxConcurrencyUnrestricted-Policy - RCAMaxConcurrency Unlimitedĥ) After making these changes, we have had success (so far) closing and re-launching Outlook several times without issue. New-ThrottlingPolicy RCAMaxConcurrencyUnrestricted-Policy O MapiHttpException= Client has dropped connection Ģ) These errors indicate a MAPI Connection limit as well as the client hitting a RCAMaxconcurrency throttling limitation.ģ) As a result we have implemented both "Maximum Allowed Sessions Per User" session limit as well as “objtMessage” open item limitation per Ĥ) In addition, we have created the below custom throttling policy that sets the RCAMaxConcurrency to “Unlimited” and assigned to test users > Cannot open mailbox /o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=7cc5305b5b0948f5a0d6ded589ced900-test1. We were seeing the below errors/warnings in the MapiHttp logs located here: C:\Program Files\Microsoft\Exchange Server\V15\Logging\MapiHttp\Mailbox\Mapi_Http_xx_x.log when a client dropped it’s connection. We were able to identify the issue and remediate. Has anyone experienced this before or have any advice? Maximum Allowed Exchange Sessions Per Service Maximum Allowed Service Sessions Per User \\HKEY_LOCAL_MACHINE \SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem. Lastly, I tried adding the below registry keys on the Exchange server and setting to a really high number and restarting the Exchange Information Store. Close any applications that is using this fila, and then try again. ![]() I restarted several services (RPC Client Access, Information Store, Frontend Transport, etc.) and none of this fixed the issue. The file C:\Users\XXXXX\AppData\Local\Microsoft\Outlook\ - ProfileName.ost is in use and cannot be accessed. We removed all of them and disabled ActiveSync and OWA. In addition, this user has (or had) a lot of shared mailboxes added. OWA works and mobile device appears to be working.Įdit - have tested using Office 2016 and Office 2019 on multiple different systems with cached mode turned on and also disabled. I feel like this is hitting some sort of threshold/limit but I don't know where to check in Exchange. Most of the time if you close Outlook and try re-launching, it will not open. Sometimes it will allow you back in 2, maybe 3 times in a row no problem but then randomly doesn't let you in (very intermittent). Everything works until you close Outlook and try to re-launch where you are presented with the initial error message. At first I thought it was a bad Outlook profile so we removed the profile from Control Panel -> Mail, removed local user credentials in vault, emptied AppData Local and Roaming Outlook directories and re-created the profile. Network problems are preventing connection to Microsoft Exchange". I have a couple users that when attempting to log into Outlook they get message: " Cannot start Microsoft Outlook. Recently just went through migration of Exchange 2010 to Exchange 2016.
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