It seems to be official that TalkTalk is misleading us regarding fixing bugs in HG633. The broken DDNS was reported more than an year ago and there were several firmware updates but none of them addressed DDNS.
Did anyone succeeded configuring DDNS using a free DDNS service. Most of these services, if not all, are generating long passwords (GUID-like ones).
PS. Using "paste" on the password field does not work because one "smart" guy decided to put a onpaste=return false in the HTML code of the form. I never punched someone in the face but if I meet him, I will break that record.