We have a proxy firewall that requires users to authenticate with their windows credentials. It is not integrated to prevent malware issues. We have noticed that unless we turn the proxy off in IE (Settings, Lan Settings, Proxy), the OCS client has problems connecting to the exchange server (or rather the OCS web service on the front end server that connects to exchange) and downloading the GAL. Anyone know why this is? Does OCS use the IE settings?
Interestingly enough, for all internal addresses, IE is supposed to bypass the proxy, so the prox should really not be causing an issue.