Thunderbolt Bridge

Hey,

I've a problem using Thunderbolt Bridge. I'm sharing my internet connection from my iMac to my MacBook Pro using the Thunderbolt Bridge option. It's working pretty good, but in some cases, I'm not allowed to visit websites.

For example using amazon. I can visit the page, but I can't login. If I'm using wifi on my MacBook, I'm able to login.

Is there a solution to "fix" that?

Router: Fritz.Box 7360

FRITZ!OS: 06.50

Best regards