php bulletin boards are tough.

have you tried wGET ?
I found a phpBBS that uses all relative links and was able to download it
pretty easy using wGET. but I haven't found a way to do it with HTTrack. with
wGET and relative links, you just turn it loose in recursive mode and it will
download everything but not stray off the original site.

with wGET the problem can be ROBOTS.txt which HTTrack can ignore. If I get a
few I'll try the site and passwords you posted and see what happens.