I'm running into a Managed Availability issue. My server has the ActiveSync health set Unhealthy. After investigation I noticed the following error when the probe runs:

WARNING: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

Command used: Invoke-MonitoringProbe ActiveSync\ActiveSyncCTPProbe -Server <servername>

I was not able to troubleshoot the issue any further from this point. This happens on all servers, Exchange 2013 CU7. I did not make configuration changes against the EAS virtual directory. Reboots, restarting services and waiting did not solve the issue. The information on https://technet.microsoft.com/en-us/library/ms.exch.scom.activesync%28v=exchg.150%29.aspx did not help either, because I'm stuck with the error message.

• Edited by Jetze Mellema Tuesday, May 26, 2015 12:20 PM

Hi Andy, how are you? Yeah, I ignore them usually but they are becoming a bit of a problem now. It looks almost impossible to have the server 'all green' in SCOM with two or three of this nasty issues on every single s

Hello Winnie, thank you for your reply. Please don't propose Andy's post as answer because it isn't. I understand there's apparently some kind of benefit by marking as many topics answered as possible but this behavior negatively impacts the quality of the TechNet forums.

That being said, I see no issues with my health mailboxes.

Installing CU8 is not a not a trivial step, this is not something people do 'to try'. Unless this is a known issue which is fixed in CU8 but I did not see it in https://support.microsoft.com/en-us/kb/3030080 Unfortunately we're not ready yet to install CU8 in the production environment.

I did notice https://support.microsoft.com/en-us/kb/3026674 which you mentioned too but I fail to see the similarity with my issue. 

Upgraded some servers to CU8 last weekend, the issue has not been solved unfortunately.

We have same issue on one server. But on the second server there are another warning:

Invoke-MonitoringProbe -Identity "ActiveSync\ActiveSyncCTPProbe" -Server <servername> | fl