In regards to the issue member bache_plus is having, I remotely logged in to his PC and did some basic troubleshooting, pining the pool had very bad results, an average of 300ms, I tested a few other pools and they all seem to work just fine, so my guess is that his ISP is blocking the mining port to CK pool, however, the ISP would have blocked larger pools if they wanted to stop him from mining, this pool is relatively small and infamous, so I am not certain about this.
The thing is that port 80 works just fine, HTTP requests go through just fine, when he managed to connect earlier I guess it was on
can you enable port 80 for testing?
if not, or if that doesn't work, setting up a relay in EU if other people agree to it will be worth it, I can only assume that a good number of miners reside in the east side of the world, so a relay pool will solve both ISP restrictions and latency.