Exchange 2013 – 451 4.4.0 Primary target IP address respondet with “421 4.3.2 Service not available”

Recently I had an issue with all distribution lists on Exchange 2013 Server. All E-Mails send to DL are Stuck in Mailqueue with error : : 451 4.4.0 Primary target IP address respondet with “421 4.3.2 Service not available”

Used get-ServerComponentState -Identity servername . and found that the “Hubtransport component”is in draining state.

The issue was resolved with:

 Set-servercomponentstate –component Hubtransport –state Active –requestor maintenance

For more infromation:

http://blogs.technet.com/b/exchange/archive/2013/09/26/server-component-states-in-exchange-2013.aspxhttp://blogs.technet.com/b/nawar/archive/2014/03/30/exchange-2013-maintenance-mode.aspx

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