On 25/09/2020 10:26, Christian Eyrich via Exim-users wrote: > I’ve sent mails from @outlook.de to my server but the TLS encrypted > communication just stops at one point after some progress through EHLO, > MAIL FROM, RCPT TO (exim -bd -d+all): > > 10:04:45 15402 SMTP>> 250 Accepted > 10:04:45 15402 tls_write(0x558a49151ac0, 14) > 10:04:45 15402 gnutls_record_send(SSL, 0x558a49151ac0, 14) > 10:04:45 15402 outbytes=14 > 10:04:45 15402 DSN: orcpt: NULL flags: 0 > 10:04:45 15402 Calling gnutls_record_recv(0x558a4920e660, > 0x558a494e9000, 4096) > > Then after 300 seconds the connection is closed. > > This is with Exim 4.92, GnuTLS 3.6.7 from Debian Buster. > I already stripped away every config change I did for TLS ciphers or DH > params. > > I know it worked in the past. And it still works without TLS. Maybe it’s > a problem of GnuTLS or maybe on Microsoft side, supposedly in some edge > scenario. But how can I debug it further?
There may be a bit of debug output earlier on, during the TLS handshake, talking about the session secrets. If so, fire up wireshark. If not, compile yourself a current Exim from git, first. What we're looking for is the encrypted version of that write going out on the wire - and whether there is any response of any kind, on the wire. -- Cheers, Jeremy -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
