Login with iOS app returns a "protocol error"

@bucher wrote:

I want to use the iOS app on my iPhone 6 (iOS 11.2.5).

I get an error (see picture below) whatever user I try to login with, even with anonymous.

On my site I run SSL with Let’s Encrypt. My hosting provider checked the SSL settings, it is ok.

Login with the mobile browser Safari on iOS works fine, so I assume the issue is not with the user credentials or permissions.

fullsizeoutput_27d.jpeg750x1334 114 KB

The error logs on the server record no entries after the login attempt.

Thanks für any help.

Regards.

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