If you are having problem connecting to server then check this out!

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Originally Posted by robert_akk

My problem was that I couldn't connect to the server. I can play on another computer, even on my mobile using the same network. I tried to reinstall windows and I still couldn't play on both windows XP and 7. Once I created another user account, I can play. Why is that? It's because I have installed IDM(Internet Download Manager) and have enabled "Use advanced browser integration", which interfering with PL. Once I disable the function, I can play it without problem.
Therfore, for those who have IDM installed, and can't play PL.

Here is a solution!
1. Open IDM
2. Go to Download => Options
3. Uncheck "Use advanced browser integration"
4. Click "OK"
5. Restart your Google Chrome!

Enjoy!

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There is a stcky thread for it in PL Chrome section but i posted here so that i can help out people who play SL and dont check PL forums.