Another new change in CU-277 is a new flag allowCrossDomainRequests=”true” added to the Web.config file as per KB3209567 Unfortunately, they failed to mention which one(s). As it turns out, there are 60 web.config files in the Skype for Business installation folder, or at least there is in my installation, and all under Web Components.
The following folders contain a web.config file with allowCrossDomainRequests=”true” setting present in it.
Now, it seems that it doesn’t modify the file, but replaces the file and what is partially confusing is the last modified date of these file. Join Launcher has a modified stamp on Dec 22, 2016 and UCWA is modified Oct 12, 2016. The AutoDiscover and Web Ticket files date back to 2015 so not any recent changes. It seems that regardless that the Join Launcher web.config is the only newly modified one, others are replaced as well.
Why I bring up the date, is I modify the UCWA web.config files, I change the key value for MobileApplicationExpiryTimeInDays from 15 to 1. There was an issue with Skype Mobility clients and Call Forwarding would “break” because the server thinks the Mobile Client is still signed in so the Forwarding or SimRing to the mobile number won’t take place. The setting change kicks the Mobile Client after 1 day, instead of waiting 15 days before timing out the client, and the problem because less noticeable. Actually I haven’t had a complaint since. We never could lock down when the issue would start, either the client was being updated when it was already signed in, or moving from internal to external networks, but something would happen that would change the client ID associated with that device, so even signing in and signing out didn’t matter as the registered ID on the server was new. Why 15 days, no idea. 1 day works great and no negative consequences that I’ve ever detected.
If anyone has any other customization that they made to a web.config file, you may want to review them and see if they’ve been over turned.
That is actually one of my most favorite quotes, and probably from one of the best Futurama episodes, Godfellas.