always worth considering the following commands in a command prompt:
ipconfig /release
ipconfig /flushdns
ipconfig /renew
See if the problem continues - sometimes windows dns cache needs a clean. This can also be achieved by a reboot, but why restart when a couple of command lines often will fix the issue?
I'm still seeing the 11001 - interestingly I had two instances of Alt.binz running on two different machines with two different IP addresses - as you may know Astra subscription accounts wont allow multiple IP addresses, and I started seeing error 11001 on both machines as they both fought to access Astra, meanwhile another Level 0 primary provider who is a little more relaxed to allowing multiple IPs was happy for both machines to connect at the same time.
So again, I feel that while it could be a DNS related issue, it could also be a timeout - in this case, Astra's system rejecting my multi-attempted connect and not just responding with "Multiple IP address detected etc etc" but blocking the request altogether and if the TCP request to the port isn't acknowledged, then an error 11001 might be displayed.
rdl, you might be able to confirm/deny my analysis? cheers.