Blank Login screen - DNS issue

At my company's site we seem to be experiencing an intermittant blank login screen but only for the microsoft sign in page, the Skype sign in page loads up fine.
When skype loads up we get this screen:
And the users choose "Microsoft account". They should then see this screen:
Instead they get this:
At the bottom there is a warning message saying the following:
"This page contains errors. Go back"
The site is using OpenDNS to filter DNS queries for the PCS and the policy is fairly locked down.
On any affected PC, if I:
- Close Skype
- Point the DNS settings to something like 8.8.8.8 (google's DNS server)
- Load up skype
The login screen (image 2) loads up normally. The user can login and I can then flip back the DNS settings to the OpenDNS server and there are no further issues.
What this means is that Skype is trying to contact a Microsoft/Skype server somewhere on the interent and because it is not on my OpenDNS whitelist it gets blocked and fails like in image 3.
My question is can anyone tell me what the server is? I went through the OpenDNS logs and whitelisted a bunch of microsoft stuff and some other things related to certificates but still no luck.
Solved!
Go to Solution.

Evetually I took Techfreak's suggestion and sniffed the packets with wireshark. Was annoyed to discover that the root cause of the issue was suspiciously named sb.symcd.com.
Some quick Google-fu led me to a page which advised that this domain should be whitelisted for Lync installations. Hmm.
Why microsoft could not use more intuitive/descriptive server names is a mystery. Anyway, I whitelisted *.symcd.com and from the limited testing it appears to be resolved.

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Solution for empty/blank login screen

i will try it, thanks dude
Regards,
Golcash

If the issue persists for you even after following all the steps please click on
to create your own topic. Please supply as much information (Windows version, Internet Explorer, content of any error messages you saw...) as possible so we can help you faster.
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Blank Login screen - DNS issue

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