[Xymon] Any known issues with https testing via proxy

Trying to get https testing working via proxy and works fine via curl but xymon reports proxy 501 not implemented errors so I assume its showing up malformed. I see in sourceforce release notes a fix from 4.2 > 4.2.2 for this related to Debian but I am running above this (4.3.17)

snip:

Changes from 4.2.0 -> 4.2.2 =========================== *) Patches from Debian and Mandriva source archives and elsewhere have been merged, fixing: - The bb-hosts syntax for HTTP testing via a proxy could not support https target-URL's (from Debian)

Thx in advance Danny