and thank you before hand. I am running an exchange 2010 sp3 server and it has been running for well over a year with no issue. I use a single cert purchased from godaddy and have made all the necessary config changes to the virtual directories and created a split horizon dns to support it. The autodiscover is set up as a svc record on my external dns hosting site. As I have said everything has been running flawlessly for over a year. All of a sudden this week when folks returned to work from the holiday weekend, when they opened outlook it connects and all functions perfectly except after about a minute or so a certificate warning pops up and asked them to accept it. The name it gives is my.domain.com.com. So the domain name is right but there is an extra .com added. Viewing the certificate shows that it is issued *.com.com and was issued by rapidssl. From what I have been able to gather this belongs to amazon technologies. I have checked the IIS certificate stores, The local computer certificate stores and checked dns to see if any changes had been made. There has been not updates or changes to exchange made recently, so it just spontaneously began. Mail functions, all the activesync for phones and owa functions and when you tell the certificate warning no it disappers and everything roles on until you close and open outlook again. The outlook clients being used are 2007, 2010 and 2013. The outlook clients have been running also for awhile so nothing was upgrade or a new outlook client add to a workstation recently.
Thank you for any guidance you might provide