I am using Empathy as an IRC client.
closed as off topic by jokerdino♦, con-f-use, Jorge Castro, htorque, hbdgaf Aug 22 '12 at 1:43
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FreeNode will require you to authenticate to NickServ each time you connect to the network to be recognised as a registered user, so most likely you are occasionally being disconnected.
If you would like to identify with NickServ automatically, you can use your nickname password as the network password when connecting to the network.
In Empathy, this can be done with the following steps:
Once this is done, you should be able to verify that you get identified by disconnecting and reconnecting: NickServ should tell you that you have successfully identified shortly after connecting.