Apparently now there is special mobile version (not sure when it appeared, I do not use it from mobile very often). Unfortunately, it does not work on iPhone. When I go to main page (forums.opensus.org) I get list of language subforums, but they are not clickable. No way to proceed further. If I somehow manage to find a link to content inside (e.g. to something inside English section) I can browse further without apparent issues.
Also I cannot verify whether authentication works now because after entering password I land at the main page (see above)… same issue as with normal forums actually. Why, oh why, it cannot redirect back to referral page 