Imap accounts won't go online

A very strange thing started to happen to my Macbook Pro since yesterday. My Imap accounts won't go online. My internet is working fine. My POP accounts sync normally. When I try to put the Imap accounts online Mail gives me the following message "error 51 - network is unreacheable". I have no idea of how to correct this.
Thanks for helping,
Marco
Macbook Pro Intel   Mac OS X (10.4.9)  
Macbook Pro Intel   Mac OS X (10.4.9)  

Well, I don’t know what could be the problem either, but something to look at is that there is nothing wrong with your network settings.
In particular, go to Apple Menu > System Preferences > Network, choose Network Port Configurations from the Show popup menu, and make sure that the configuration used to connect to Internet appears at the top of the list. Try also turning OFF all the network port configurations except the one needed to connect to Internet and see whether that makes a difference -- if it doesn’t, turn ON again the ones you want enabled.

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