Smart firewall blocking printer

I have a printer on a home network windows 7 box. When trying to print from another computer to it, I get "RPC server unavailable". Now, If I turn Nortons smart filtering off, on the remote PC, I can print to it just fine.

 

I can't figure out the settings to fix this, other than disabeling the smart filter every time I want to print.

 

Any help would be appreciated.

 

Thanks,