Forward proxies are not supported with ClearCase Remote Client (CCRC) and Change Management Server (CM Server) in ClearCase 7.1
The Eclipse preferences dialog box under Team->ClearCase Remote Client->Connections allows the Proxy Name and Proxy Port to be set for HTTP forward proxies. However, these settings are currently ignored.
The underlying HTTP implementation does not support forward proxies.
Resolving the problem
There is currently no workaround for this problem. It will be fixed in a future patch.