I can't think why you would be blocked from the Support forum and not from this one. Try again; it might be some transient network issue.
If you continue to be unable to get in, send an email to email@example.com. If some firewall setting is preventing legitimate customers in Denmark from getting support, Rex will want to know about it.
Oh, and if you're trying to post a message containing the string "CMD.EXE", try it without that string. Just call it CMD. CloudFlare seems to object to that string.