Recently, we had some systzem updates, which we installed on our exchange server, which is a Windows Server 2003 R2 SP2 (X64). On the first try, the update failed to install and made the system hang. At the second try, update seemed to succeed.
Since then, we were unable to access exchange at all. At services, all exchange services were disabled and stopped. They had to be re-enabled and restarted one-by-one. Additionally, external workers of our company couldn't access exchange via OWA, getting "page not found" or similar messages on their browsers, even after the mentioned services were running again.
As we found out, due to the above mentioned update issue, there were two additionally services, which also 'suffered' de-activation. This was 'WWW publishing service' and 'HTTP SSL'. I Started the two, and OWA page became available again. Unfortunately, the applets on the OWA page don't load anymore, at least not properly. So, user sees a simple text-based page, where he can log on and read his emails. This is not a browser issue, as I cross-checked this using Firefox (several versions), Chrome and even a Samsung tablet's built-in browser, from inside and outside our company network. Everywhere the same results.
The strangest thing is, that especially, accessing via Internet explorer (no matter which version) is impossible due to a certificate error. Setting up the certificate as 'trusted' in the client PC doesn't work.
EWS-based access via mail clients which support this, such as Mailwise on Android is working.
How can I re-enable the applets to be loaded again?
Why is IE acting that kind of different?
Help really appreciated.