[stunnel-users] Stunnel to Outlook

Christian Kujau lists at nerdbynature.de
Wed May 9 04:49:33 CEST 2018

On Tue, 8 May 2018, DPS Support wrote:
> 2018.05.08 15:16:07 LOG5[5]: Service [outlook-smtp] accepted connection from
> 2018.05.08 15:16:07 LOG6[5]: failover: round-robin, starting at entry #4
> 2018.05.08 15:16:07 LOG6[5]: s_connect: connecting 2603:1036:101::2:587
> 2018.05.08 15:16:07 LOG3[5]: s_connect: connect 2603:1036:101::2:587: Network is unreachable (WSAENETUNREACH) (10051)

The configured smtp-mail.outlook.com address are resolving to IPv6 
addresses as well but the host where stunnel runs does not know how to 
connect to that address via IPv6. One of the following should fix that:

1) Make your stunnel host IPv6-ready :)
2) Configure the IP address instead of smtp-mail.outlook.com
   in stunnel.conf
3) Make your stunnel host prefer IPv4 over IPv6 addresses, IIRC 
   gai.conf(5) could help here.

BOFH excuse #22:

monitor resolution too high

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