how-to block ads
There are two ways to get past this:
A) Register your nick using NickServ (if the network offers it), and use the ghost command (/nickserv help ghost) to get the server to kill the old connection instantly.
B) Just wait for the server to see that the client is dead. This will usually take less than two minutes, but can take a little more sometimes.
I recommend that you register your nick at all times so that nobody else can log on as you.