3 ms·
Gmail doesn't allow SMTP connections via IPv6
- p1mrx 11y agoYour ISP is probably blocking SMTP-related ports inconsistently. Here's what I see from Comcast Residential: $ nmap -6 -Pn 2404:6800:4003:c02::6c Starting Nmap 7.10 ( https://nmap.org ) at 2016-03-27 17:38 PDT Nmap scan report for sc-in-x6c.1e100.net (2404:6800:4003:c02::6c) Host is up (0.18s latency). Not shown: 996 filtered ports PORT STATE SERVICE 465/tcp open smtps 587/tcp open submission 993/tcp open imaps 995/tcp open pop3s Nmap done: 1 IP address (1 host up) scanned in 13.51 seconds $ nmap -Pn 74.125.68.108 Starting Nmap 7.10 ( https://nmap.org ) at 2016-03-27 17:38 PDT Nmap scan report for sc-in-f108.1e100.net (74.125.68.108) Host is up (0.19s latency). Not shown: 996 filtered ports PORT STATE SERVICE 465/tcp open smtps 587/tcp open submission 993/tcp open imaps 995/tcp open pop3s Nmap done: 1 IP address (1 host up) scanned in 12.86 seconds
- phunehehe0 11y agoI don't like the idea that Digital Ocean can be doing something that weird :) But it seems like you are right. I'll drop them a note. $ mtr --report-wide 2404:6800:4003:c02::6c --tcp --port 993 Start: Mon Mar 28 03:23:08 2016 HOST: phunehehe-do3 Loss% Snt Last Avg Best Wrst StDev 1.|-- 2400:6180:0:d0:ffff:ffff:ffff:fff1 0.0% 10 0.7 1.1 0.3 6.5 1.9 2.|-- 2400:6180::601 0.0% 10 0.3 0.3 0.3 0.4 0.0 3.|-- 2400:6180::301 0.0% 10 0.9 0.6 0.3 1.3 0.0 4.|-- 2001:4860:1:1:2:82d:: 0.0% 10 0.9 1.8 0.9 3.8 0.7 5.|-- 2001:4860::1:0:518d 0.0% 10 1.7 2.0 1.7 2.2 0.0 6.|-- 2001:4860::2:0:ab29 0.0% 10 2.2 9.5 1.8 64.4 19.6 7.|-- 2001:4860::2:0:ab28 40.0% 10 2.7 2.4 1.7 3.3 0.4 8.|-- sc-in-x6c.1e100.net 70.0% 10 127.0 151.6 126.9 200.8 42.6 $ mtr --report-wide 2404:6800:4003:c02::6c --tcp --port 465 Start: Mon Mar 28 03:23:30 2016 HOST: phunehehe-do3 Loss% Snt Last Avg Best Wrst StDev
- p1mrx 11y agoSounds like this, then: https://warrenguy.me/blog/ipv6-digital-ocean-crippled https://warrenguy.me/blog/ipv6-digital-ocean-crippled
- phunehehe0 11y agoYou are exactly right. Thanks again.