Cannot connect to the marketplace

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Hello everybody.

First of all i love concrete5 but now i have a problem.
My server cannot connect to the community. I enter my credentials correctly (tested before on the webpage of concrete) and hit enter. After that i see a shrinked version of a login page where i have to reenter informations. If i enter the same credentials i got an error, that the form token is not correct and i have to reload the form.

What iam doing wrong. I plan to install multiple sites with concrete5 but no site can connect to the community.

I created a new profile for the community and tried it again. No luck.

Please help me