Using ZCS NE trial (8.0.4)
I am unable to setup Exchange accounts on my android and iOS devices. Both fail to authenticate with server using http or https/SSL giving me "Server error occured. Check your username and password and try again" (android) and "unable to verify account information" (iOS);
Mobile sync is enabled, ports are open (did try telnet) and all ZCS services are running. Even tried installing signed certificate

using following connection data on mobile devices:
server: host used for webmail access
domain: blank
username: full email address

Any ideas where to look?

Thanks in advance,