Having the same problem. Seems to have gone down sometime between Wednesday and Saturday. Ive been on the phone with Linkpoint about 4 times yesterday, chatted/messaged dreamhost about 7 times yesterday, first data 1-2 times.... NO ONE says it is there end. Now i know i didn't change anything at all on ANY of those accounts so i told dreamhost its obviously a setting or something got changed behind the scenes. they said they are not blocking port 1129 and it is able to connect to the secure.linkpt.net address with no problems.
Finally late last night i found this posting on zen cart's forums (i use oscommerce)
theres about 4 other people having this problem, so i know its a widespread issue with someone...common link being hosted at dreamhost.
I dont know what to do at this point. When do they expect CURL to be working again!? I am literally seconds away from switching hosts, processors, merchant banks, cartsoftware and everything just so i can take a payment again. i'm coming up on a week of no money being made at this point.