So the first thing was testing if DNS is working and I will get the correct IPs for the Webservices FQDN and the Edge Access Server FQDN.Įverything was fine and I got the correct IPs.
Here you can see the sign-in attempt from external at the affected client.īecause of this error message the first thought was network connectivity issues. Internal the affected clients can sign-in without any issues. So this is always an ungrateful situation and costs a lot of time digging into it, especially since the skype for business sign-in process is very complex. Recently I had to deal with sign-in issues a few external sfb desktop clients on a non-regular basis experience.