Lync Mobility can't sign-in from internal WiFi

As far as I can tell from researching on this topic, the internal DNS record of lyncdiscoverinternal is not that important. Internal wifi connected mobile devices will try to connect to lyncdiscover through the external side of the TMG. Now for me, external mobile devices connect no problem. I can nslookup the lyncdiscover DNS record from external networks. But from the internal network, I can't seem to nslookup the lyncdiscover DNS record. Would this be why mobile devices connected to internal WiFi are not able to sign-in to Lync mobility service?

March 13th, 2012 1:02pm

This article should clear up the internal wifi process and give you some options:

http://www.shudnow.net/2012/03/12/using-lync-2010-mobility-on-your-corporate-wifi-networks/ 

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March 13th, 2012 1:03pm

We have public CA certificate installed for all Lync servers. I'm now guessing (after reading through the article) I need to create an internal DNS record of the external web services FQDN pointing to the public IP of the TMG?
March 13th, 2012 1:35pm

Hi,evesoft,

You should make the internal DNS record for external web services FQDN pointed to internal IP of TMG instead public IP.Below is the original statement in the above article:

"If for whatever reason, you cannot hairpin the traffic so the internal WIFI network can communicate to the external web services public IP address, would be to point the external web services FQDN that is located in Internal DNS to the Internal IP address of your Reverse Proxy Server.  With this mechanism, when the Mobile Client while connected to WIFI gets the external Web Services FQDN while on Internal DNS, they will get a private IP response and connect to Reverse Proxy in that fashion.  When an internet connected mobile device gets the Autodiscover Response and does a DNS lookup, they will receive the Public IP address of External Web Services"

B/R

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March 15th, 2012 7:46am

We are now in 2014 and just came upon this problem now.

My Iphone and Android connect on 4G but when on Wifi they throw up error messages that dont even register in the logs.

I already have my External web services FQDN pointing to the Public IP of the Reverse Proxy. Dont know what else to do ...help ?

August 5th, 2014 8:32pm

Hi,

Issue was the same for me and the problem was i forgot to add the Internal IP to the the TMG servers listener that was applying to the rule. Silly but might be what someone else missed

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July 24th, 2015 8:44am

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