Can't connect to Fritzbox

Hi,

I'm using a computer that is connected to another computer via WLAN. The WLAN router is a Fritzbox and I can access the Internet throught it. However, I can't connect to the printer which is connected to the Fritzbox. My computer recognizes the Fritzbox and even the printer but when I hit "Print" in an any application, I get the message "can't connect to Fritzbox".

What might be the solution?
Thanks in advance,
Torsten

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