Return
-
Title
Fail to create a runspace because you have exceeded the Maximum Number of Connections Allowed -
Description
When synchronizing mail using the MAgE (Migration Agent for Exchange) the following warning message is displayed for some users.
Warning Fail to open runspace using Kerberos auth mode; System.Management.Automation.Remoting.PSRemotingTransportException: Processing data from remote server failed with the following error message: (CAS SERVER) Fail to create a runspace because you have exceeded the maximum number of connections allowed : 18 for the policy party : MaxConcurrency. Please close existing runspace and try again. -
Cause
This can happen when the MaxConcurrency limit of the default throttling policy has been reached. -
Resolution
To prevent possible issues in an Exchange 2013 organization, you should create custom throttling policies, apply them to the Target Exchange Accounts and and then restart the Microsoft Exchange Throttling Service. To do this, run the following cmdlets in Exchange Management Shell for each Target Exchange Account:c <QMM_Exchange_Account_Throttling_Policy_Name>Set-ThrottlingPolicy <QMM_Exchange_Account_Throttling_Policy_Name> -PowerShellMaxConcurrency <MaxConcurrency>Set-ThrottlingPolicyAssociation -Identity <QMM_Exchange_Account_Name> -ThrottlingPolicy <QMM_Exchange_Account_Throttling_Policy_Name>Restart-Service -Name MSExchangeThrottlingwhere MaxConcurrency is the number of Migration Agent for Exchange (MAgE) instances simultaneously working with Exchange 2013 server, multiplied by the value of 5.