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Exchange Team Blog
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Released: March 2021 Exchange Server Security Updates

The_Exchange_Team's avatar
The_Exchange_Team
Platinum Contributor
Mar 02, 2021
Note: this post is getting frequent updates; please keep checking back. Last update: 3/19/2021 Microsoft has released a set of out of band security updates for vulnerabilities for the following ver...
Updated Mar 19, 2021
Version 44.0
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Marc__K's avatar
Marc__K
Brass Contributor
Mar 06, 2021

My servers have started to log a new event in the Application log.  I wonder if this is the attack failing due to the security update being in place.

 

[Ecp] An internal server error occurred. The unhandled exception was: System.ArgumentException: Invalid input value
Parameter name: input
at Microsoft.Exchange.Data.ApplicationLogic.Cafe.BackEndServer.FromString(String input)
at Microsoft.Exchange.HttpProxy.BEResourceRequestHandler.ResolveAnchorMailbox()
at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.InternalBeginCalculateTargetBackEnd(AnchorMailbox& anchorMailbox)
at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.<BeginCalculateTargetBackEnd>b__3b()
at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(TryDelegate tryDelegate, FilterDelegate filterDelegate, CatchDelegate catchDelegate)