Home > Exchange, Exchange 2010, Microsoft, Migration, PowerShell > Having problems when migrating into 2010 SP1?

Having problems when migrating into 2010 SP1?


Just a quick one,

I work primarily as a migration consultant – so most of my “day job” is to migrate people from one technology to another.
A big bulk of this is GroupWise (or Notes) to Exchange migrations – typically using migration tools such as Quest Groupwise Migrator for Exchange.

Taking the GroupWise to Exchange as an example – you can be quite often pulling email from 7/8 different physical servers at once – so to aid in this I personally would create multiple migration workstations which then generates (literally) hundreds of connections into Exchange.

SP1 introduces some CAS throttling – this may have been in place pre-sp1 but didnt seem to have any effect.

However in SP1 you may find yourself unable to connect to the CAS/MAPI service if you already have a lot (>100) connections.

Error logged will be;

Process Microsoft.Exchange.RpcClientAccess.Service.exe (PID=2132). User ‘Sid~NTNET1\USERNAME~RCA~false’ has gone over budget ‘235’ times for component ‘RCA’ within a one minute period. Info: ‘Policy:DefaultThrottlingPolicy_c05f158f-9c0b-4289-ae1b-4717eee77548, Parts:CAS:234;’. Threshold value: ‘100’.

To fix, remove the throttling via the following PS script;

$default = Get-ThrottlingPolicy | where-object {$_.IsDefault -eq $true}
$default | set-throttlingpolicy -RCAMaxConcurrency $null
$default | set-throttlingpolicy -RCAMaxConcurrency $null -RCAPercentTimeInAD $null -RCAPercentTimeInCAS $null -RCAPercentTimeInMailboxRPC $null

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  1. Daryl Musashi
    February 15, 2011 at 4:21 pm

    Is it wise just to blindly remove the throttling? Wouldn’t a more appropriate question, before removing the threshold, be why is this user having so many connections?

  2. February 15, 2011 at 5:49 pm

    Hi Daryl,

    Thanks for your comment – however I should probably clarify how I got to this point and why I published this “fix”.

    I’ll outline it here, then amend the original post 🙂

    I work primarily as a migration consultant – so most of my “day job” is to migrate people from one technology to another.
    A big bulk of this is GroupWise (or Notes) to Exchange migrations – typically using migration tools such as Quest Groupwise Migrator for Exchange.

    Taking the GroupWise to Exchange as an example – you can be quite often pulling email from 7/8 different physical servers at once – so to aid in this I personally would create multiple migration workstations which then generates (literally) hundreds of connections into Exchange.

    The post was positioned for people in the same boat as me on this – and to give them an answer to the error message 🙂

    Hope that helps!

    Stephen Croft

  3. Daryl Musashi
    February 15, 2011 at 6:40 pm

    Ah, I understand your thought process. I’ve been running 2010 for about a year, and SP1 for 2010 about 2 months. Just started getting this exact error for 1 particular user. Not being all that sure about the error, I was running a search and ran across your post. Good solution, but perhaps not the right one for me. I’m currently in the process of trying to figure out what happened that all of a sudden a single user is getting these errors repeatedly.

    • February 15, 2011 at 11:40 pm

      I would start with the obvious – the user. Anything special about them, Ie are they some kind of pa?

  4. RES
    March 22, 2011 at 3:24 pm

    Did you find any reason for this? We have, like you, a single user causing this error on the exchange 2010 (SP1) server.
    The only thing that is different, is that it is the biggest mailbox on the server (but not that big – less than 2 1/2gb) and they open 4 additional mailboxes. They also used to use ACT which had a tentacle into outlook client. However, there are other users in the same department with similar setups.

    many thanks to anybody for any enlightenment on this one!

    • March 22, 2011 at 3:55 pm

      I’ve not seen it outside of the scenario posted – but I was making hundreds of connections 🙂

      Does the user get it if they close a mailbox?

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