Some feedbacks about this..
I couldn't get /localinfo -p to work (7.39) so I started investigating again with wireshark to find some clues (still on win7 pro 64 bit, router is still the same, upnp is enabled and works for socklisten -p, or dcc, or identd server on port 113 (the same port which wouldn't work before on this same report))
While I was trying to see with wireshark if anything was sent from mIRC it somehow magically started to work (first time ever for me, for /localinfo -p).
I tried to reboot mIRC, still working, I tried to reboot Windows, still working..
So I just let it go, but one hour later here I am trying it again, it doesn't work.
When it fails, I just don't see any request or anything sent from mIRC to the router with wireshark, it seems mIRC fails automatically without actually trying anything upnp related because of a prior check that would fail.
Is there a way for mIRC to report "/localinfo: unable to resolve local host" without actually trying to do anything upnp related?
