For periods of a couple hours, randomly, each day, our OWA website is not available externally when referenced via a host name. During this period of outage, OWA is available if I replace the hostname with the public IP. I reviewed the IIS logs and there are no entries for the hostname based requests. Its like IIS is not getting requested at all. I immediately test local and external IP and IIS logs produce entries (and of couse OWA is viewed in browser). The message that is produced upon failure is the failed to load error...diagnose your browser, etc. No errors from IIS.
I made sure the firewall is not blocking and that i have no licensing issues on that. I have tested hostname resolution and pinged fine during these outages. We are running server 2008 R2 and Exchange 2010 with rollup 4. This is a brand new install. We are running forms based authentication and presently we are using a self signed certificate. No errors of any reference in system or applications logs to this issue. We have no critical events at all actually.
Oh yeh...firewall is completely off. The outages are not during heavy traffic times either...they are random. Again, only when referencing OWA using a host name.
What am I missing?