Here is a weird one, RPC over HTTPS would not connect on this PC, I tried reconfiguring the profile, checked the time the date were correct, ensured that the certificate warning did not appear when the OWA page was accessed etc. But nothing in the end here was what i did it was the winhttp.dll that had disappeared heres what I did to fix it:
Recreated profile.
Checked dlls. Lspfix appeared to be okay too.
After much fiddling tried:
rpcping.exe -t ncacn_http -s ExchangeServerName -o RpcProxy=ProxyServerName -P “user,domain,*” -H 1 -u 10 -a connect -F 3 -E -R none
rpcping.exe -t ncacn_http -s exchsvr1.mydomaininternal.local -o RpcProxy=owa.externaldomain.com -P “username,mydomaininternal.local,*” -H 1 -u 10 -a connect -F 3 -E -R none
T his gave the error that winhttp.dll was missing, and that looked to be the key to resolving it:
http://messenger.jonathankay.com/downloads/winhttp.dll
Downloaded the file and it should be put into the Windows\System32 folder. After you have the file, click Start,
then Run, type:
regsvr32 winhttp.dll
and click OK.
did the above and the profile was then able to connect properly.