I did the port forwarding as stated on this site
Both ports 161 and 4567 show stealthed on my homehub version 3 with the port scanner at gibson Research.
No reason why the instructions wont work for you.
Thanks BP1, I did see that Punj Tech Blog
before I posted, tried it and alas it doesn't work (and just gave it another, same result).
I also tried looking at others, but the instuctions are basically the same. I've tried different IP etc, ran scans on my network to make sure I'd not missed a device. GRC shows me stealthed fully on my Draytek2910 so I doubt it's something else on my LAN, the HH always shows 161 open.
Incidentally unless I'm doing something wrong* I think the Punj blog is wrongly copied from another site, my HH3b won't let you do steps 5 & 6 before 7 & 8 (you have to select a Game/Application before you can apply an IP to Devices (else the HH errors/rejects)).
Odder still while writting this I've experimented further, deleted the rule completley, restared the HH, 161 is open, yet 4567 is stealthed but I've not got a forward rule at all!
I'm at a loss. Can you confirm your a version B HH and the software version is as my first post please?
*I did get 4567 from open to stealthed and I'm usually good at following a script (I did 10+ years in system test) but still human/tired.