I could do that, certainly, but I can't imagine what else there is to check. There's no other software on my computer using the same ports, traceroute to the DDO servers shows decent response times, I can talk and chat without issues within game even when the red connection icon is up - I just can't move - and I'm not having problems with anything other than DDO. And everything will suddenly start working just fine after an indeterminate number of logon attempts, although I have to say this is the first time I've got into double figures without success.
This time I logged onto a different toon and it worked fine... but when I swapped back to the toon having problems, I got the same issue. I am so completely baffled...