I have just setup RPC over HTTP and I had it connected externally yesterday and I sent and received e-mail, but now for some reason it is giving me the message that it can't connect to the Exchange server.
If I enter https://server.domain.com/rpc
it will prompt me like it should and when I fill in the credentials it gives me the 403.2 error as expected.
In the account settings I have basic authentication on, with server.domain.com as the proxy and msstd:server.domain.com below this.
The certificates are working too as the rpc and access to OWA shows.
when I go to the run command and put in 'outlook /rpcdiag' it just says connecting for a while and then disconnects.
Like I said, this was all working last night and it was connecting over HTTPS like it's supposed to.
The only thing I can think of is that our ISP is somehow interfering here, but then they would have to block ports 80 or 443 wouldn't they?
Does anyone have any idea what might cause this?