Nextcloud Windows says "no connection to nextcloud xxxxxxx operation canceled" but i can login in browser

Nextcloud version (eg, 12.0.2): 13.0.1
Operating system and version (eg, Ubuntu 17.04): Debian 9
Apache or nginx version (eg, Apache 2.4.25): Apache
PHP version (eg, 7.1): 7.0

The issue you are facing:

My Windows Client says "no connection to nextcloud xxxxxxxxxxxx operation canceled"
BUT i can login normally throug the webpage with my user.
In the log i only get failed login but User+Pass are correct i dont know why this happend.

Is this the first time you’ve seen this error? (Y/N): N

The output of your Nextcloud log in Admin > Logging:

Warning	core	Login failed: 'username' (Remote IP: 'xxxxxxxx')	2018-04-30T11:39:17+0200
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