Well yesterday i had a launcher issue, i checked here in forum for a solution but people say as always re-install KO / restart modem / flushdns and bla bla... And these methods 99% of the times do not works.
Well i have figure out how to fix this bug.
Before do this try turn off your antivirus / firewall otherwise if the problem is there ull not fix it.
step by step:
1- open control panel
2- double click on the icon "Strument of amministration" (something like that)
3- double click on "Services"
4- check in the list the service called "Client DNS"
5- double click it, this will open a new window
6- now press "Stop" or "Arrest service" but important leave it in "automatic" so it will start at the next computer restart
7- after u stopped this service (without restart computer) try log KO, should works
If this wont works then the problem should be or the antivirus or the firewall... or maybe servers are down
Let me know if works for you!