So have you ever ran into this problem...
I got myself banned for this... and right now I have been testing it from another continent server such as EUW and it has done wonders...
So this is what I did..
First I dropped all firewalls, windows firewall and modems firewall isnt helping that much, so I dropped them. http://support.leagueoflegends.com/entries/20132793-firewall-configuration-for-league-of-legends
Change my Antivirus for a simple and not intrusive one http://www.avast.com/index
If that doesnt helps, just open a ticket at http://support.leagueoflegends.com with this information.
- Information about your network configuration: http://support.leagueoflegends.com/entries/20132863-obtaining-a-networkinfo-log
- A process list: http://support.leagueoflegends.com/entries/20132988-obtaining-a-process-list
- Maestro logs: http://support.leagueoflegends.com/entries/20076987-league-of-legends-logs
- A Netalyzr: Just go to http://netalyzr.icsi.berkeley.edu/ and run the test. Once the test is complete, copy the full url and paste it into this ticket.
Riot ticket employees are quite helpful, I've tested with the opennig ports from another eu account and I've haven't had a problem so far...
I'll keep you posted if I find another type of solution.
Hope this helps you :)