Could be. However, I think this is an issue you should check with your Internet Service Provider. They will know better than us what kind of setup you have...
I've worked with many ISPs here in Quebec and never saw a proxy or anything similar with username/password for the customers. Usually it's DSL with PPPoE... This may differ from place to place depending on where you live.
A quick and dirty fix would be sending your username/password via an HTTP request forged in a PHP script (for example) that would be ran by cron. But I suppose your provider will have a better idea than this one...
Good luck.
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