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Jon_AK

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There are 20 users in our active directory network and all use O365 & Skype for business.  One user out of the 20 gets an error that shows frequently stating:  "The Exchange server won't let us connect.  We're working on fixing the connection blah blah blah".  Have been through a few articles and checked what was recommended  SIP address, Reply-to address etc and have not been able to correct the problem.  Did a re-install of S4B (without uninstalling first) but no luck in correcting the problem.  Help???
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lady_mcse

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First thing that comes to mind is network connectivity, not just straight connectivity but also bandwidth. Does it happen consistently across different network connections (for instance wired, wireless, on LAN, on external LAN like hotel room, coffee shop, etc.)? Does the device have any software updates that are trying to download, like a Windows Update package (because these can really choke a pipe)? If Windows 10, is the network connection set to metered (which will throttle everything and prevent Microsoft updates from installing)? Is the OneDrive sync client installed and functioning well or not? If OneDrive client installed and working well, try pausing sync for a while to see if that improves things.

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Jon_AK

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Quote:
First thing that comes to mind is network connectivity, not just straight connectivity but also bandwidth. Does it happen consistently across different network connections (for instance wired, wireless, on LAN, on external LAN like hotel room, coffee shop, etc.)?


Not wireless but a wired connection and the error occurs almost immediately after launching S4B.  Shows up as small triangle in the lower right corner of the S4B window.

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Does the device have any software updates that are trying to download, like a Windows Update package (because these can really choke a pipe)?


All software updates are controlled by WSUS server and are installed at 1am with any required reboots already having been performed. So no, no software update installation problems.

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If Windows 10, is the network connection set to metered (which will throttle everything and prevent Microsoft updates from installing)? Is the OneDrive sync client installed and functioning well or not? If OneDrive client installed and working well, try pausing sync for a while to see if that improves things.


All clients are W10 and not set to a metered connection.  OneDrive sync is fine.  From all appearances, it looks as if it is something that is on the Microsoft Lync and/or Exchange server that has a corrupt profile.  I delete out the folder contents as instructed by MS but the problem just get pushed out again.  Logged onto S4B from another network client as this user and the same problem happened almost immediately.
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Donato

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https://support.microsoft.com/en-us/help/3120929/lync-skype-for-business-client-can-t-connect-with-exchange-in-office-3

Is that one of the articles that you read? What does it say in the event viewer? Is there an event ID?
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Jon_AK

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Donato,
No, had not seen that article yet but it turns out the issue was with EWS (exchange web service).  After dealing with this for the past few days, this morning this user had a calendar event that occured stating a ExRCA test appointment.  After a bit of head scratching we discovered this stood for "Exchange Remote Connectivity Analyzer Test".   I'm assuming it was someone at Microsoft that was doing this because we didn't.  All I know is now this user no longer has the S4B error we've been trying to correct.  It would be nice to know if this was the cure for the ill but at the moment, all I can say is ...  it's fixed.
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Donato

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Reply with quote  #6 
Sometimes "it's fixed" is all you need to know.
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