After firmware patch from dahua site applied to my HDB4200C the camera does not deliver snapshot via http://x.x.x.x/cgi-bin/snapshot.cgi
Tried with credentials but not working http://x.x.x.x/cgi-bin/snapshot.cgi?loginuse=[uSERNAME]&loginpas=[PASSWORD].
Ipcam viewer can access the camera on "Dahua camera http(2)" so there is a valid url for snapshot. Please share the link if anyone discover the snapshot command.
The firmware patch replace the users 888888 and 666666 with "null" and they cannot be deleted(need another patch maybe). Also remove the snapshot.cgi.
The patch is ireversible ,in case you upload an older firmware.Beware