https://bugs.winehq.org/show_bug.cgi?id=38134
--- Comment #11 from Berillions berillions@gmail.com --- (In reply to Michael Müller from comment #8)
The problem only occurs with libgnutls28. If you use libgnutls26 instead, the login still works without issues. Seems like an upstream bug in gnutls. I try to track this down a bit more.
Please note that most distro packages have an explicit dependency on a specific version, so the only way to switch that is during compile time.
libgnutls26 package is not available on Debian repository (in fact, only in Experimental). Do you have news about the possible bug into libgnutls28 ?