Thanks very much for your reply!
However, turning on ActiveX Filtering in IE made no difference.
I should mention again the following:
-- The IP camera is directly connected to the router that serves my PC. Thus, there is no "camera site" per-se. The camera itself serves its own application, as is common with such cameras.
-- The only other way I have to gain full camera control is via a standalone application called CMS. However, its commands are also ignored by Fiddler.
-- The camera controls are, indeed, http commands. For example, to start a pan one can send:
The portion staring with command=... is displayed in Fiddler TextView. 192.168.1.10 is listed under host and /dvrcmd under URL.
-- Firefox and Opera also operate the camera (but with reduced functionality) and work correctly with Fiddler with no particular extra configuration required, except the proxy settings imposed automatically by Fiddler.
I hope this additional info will help diagnose the problem.