Exchange 2007 DistributionGroup error

Hi Experts,

in exchange on one group I have set :
-RequireSenderAuthenticationEnabled $true

Now I need to change it back to $false, but here comes the error:

+ Set-DistributionGroup -Identity "Service Objektreinigung" -RequireSenderAuthenti ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ResourceUnavailable: (:) [], RusServerUnavailableException
    + FullyQualifiedErrorId : CA825A33

Please can you tell me why I cannot deselect it ?
Eprs_AdminSystem ArchitectAsked:
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VB ITSSpecialist ConsultantCommented:
RusServerUnavailableException usually translates to "The Exchange server address list service failed to respond". Have a look here to see if this applies to your environment: http://support.microsoft.com/kb/935636

Very strange that this has only just started happening though. Maybe someone has made some changes to the environment since you enabled the setting?
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Eprs_AdminSystem ArchitectAuthor Commented:
Problem was a service.
I have restarted this service and it was working.
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VB ITSSpecialist ConsultantCommented:
Ah OK, fair enough. Please share with us the service that you restarted as this can help others who may run into the same issue that you did.
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Eprs_AdminSystem ArchitectAuthor Commented:
it was the service : Microsoft Exchange System Attendent
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Eprs_AdminSystem ArchitectAuthor Commented:
the solution came by myself
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