# SMTP TLS Handshake Error & Login Stuck on nine.testrun.org (Desktop Windows) **URL:** \ **Category:** Mutual Help\ **Tags:** desktop\ **Created:** [November 9, 2025, 1:23pm UTC](https://support.delta.chat/t/smtp-tls-handshake-error-login-stuck-on-nine-testrun-org-desktop-windows/4323 "2025-11-09T13:23:25Z")\ **Posts on this page:** 1\ **Showing post:** 5
**Author:** ![link2xt](https://support.delta.chat/user_avatar/support.delta.chat/link2xt/32/1971_2.png) [@link2xt](https://support.delta.chat/u/link2xt)\ **Post date:** [December 14, 2025, 2:25pm UTC](https://support.delta.chat/t/smtp-tls-handshake-error-login-stuck-on-nine-testrun-org-desktop-windows/4323/5 "2025-12-14T14:25:48Z")
In this case it is “tls handshake eof” so it looks like TCP connection is started, but then the network (corporate firewall or some other internet censorship middlebox) dropped the connection and this resulted in TLS library failing to read the rest of TLS handshake. It could indeed be caused by recent changes wrt not sending SNI in some cases ([Server Name Indication (SNI) extension during a TLS handshake - #2 by link2xt](https://support.delta.chat/t/server-name-indication-sni-extension-during-a-tls-handshake/4463/2)) and the middlebox configured to terminate connections this way when not recognized SNI is found. Without any respones and logs we cannot debug this further, but can also recommend trying some other relays and if they work, migrate existing profiles to using a working relay: > [@How to migrate your profile to another relay (version 2.33)](https://support.delta.chat/t/how-to-migrate-your-profile-to-another-relay-version-2-33/4441): > > Let’s say you have initially created a profile on the default relay and want to migrate away from it. Update at least to 2.33 on all your devices: [Help testing upcoming Delta Chat 2.33.\* release!](https://support.delta.chat/t/help-testing-upcoming-delta-chat-2-33-release/4427) Updating all your devices is required if you have multiple of them as only 2.33+ releases support using multiple relays, have an UI for it and can receive synchronization messages to update the list of relays. If you have not upgraded all your devices yet or do not have them around e.g. because you … --- _[View the full topic](https://support.delta.chat/t/smtp-tls-handshake-error-login-stuck-on-nine-testrun-org-desktop-windows/4323)._