Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: systemd (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1805027
Title:
systemd-resolved can't resolve Comcast mail server addresses
Status in systemd package in Ubuntu:
Confirmed
Bug description:
1) Ubuntu release: 18.10
2) systemd-resolved version: (Default latest version that comes with Ubuntu
18.10)
3) Expected behavior: Comcast's POP3 mail server addresses to be resolved to
IP addresses
4) Actual behavior: Comcast's POP3 mail server addresses can't be resolved
to IP addresses
Starting on Monday, November 19, 2018, Comcast made a DNS change
related to its POP3 mail servers (mail.comcast.net and
pop3.comcast.net) that prevent resolved from being able to resolve
those domains into IP addresses. When I try to ping either host
(mail.comcast.net or pop2.comcast.net), I get this error:
tom@deathstar:~$ ping mail.comcast.net
ping: mail.comcast.net: Name or service not known
tom@deathstar:~$
When I manually lookup up the domain, I get these results:
tom@deathstar:~$ nslookup mail.comcast.net
Server: 127.0.0.53
Address: 127.0.0.53#53
Non-authoritative answer:
mail.comcast.net canonical name = imap.ge.xfinity.com.
Name: imap.ge.xfinity.com
Address: 96.118.242.209
Name: imap.ge.xfinity.com
Address: 96.118.242.197
Name: imap.ge.xfinity.com
Address: 96.118.242.233
Name: imap.ge.xfinity.com
Address: 96.118.242.225
Name: imap.ge.xfinity.com
Address: 96.118.242.226
Name: imap.ge.xfinity.com
Address: 96.118.242.217
Name: imap.ge.xfinity.com
Address: 96.118.242.208
Name: imap.ge.xfinity.com
Address: 96.118.242.230
Name: imap.ge.xfinity.com
Address: 96.118.242.232
Name: imap.ge.xfinity.com
Address: 96.118.242.218
Name: imap.ge.xfinity.com
Address: 96.118.242.211
Name: imap.ge.xfinity.com
Address: 96.118.242.242
Name: imap.ge.xfinity.com
Address: 96.118.242.221
Name: imap.ge.xfinity.com
Address: 96.118.242.196
Name: imap.ge.xfinity.com
Address: 96.118.208.40
Name: imap.ge.xfinity.com
Address: 96.118.208.99
Name: imap.ge.xfinity.com
Address: 2001:558:fc11:9:f816:3eff:fee8:4f07
Name: imap.ge.xfinity.com
Address: 2001:558:fc11:9:f816:3eff:fe7d:1b0c
Name: imap.ge.xfinity.com
Address: 2001:558:fc11:9:f816:3eff:fe25:5ae5
Name: imap.ge.xfinity.com
Address: 2001:558:fc11:9:f816:3eff:fef6:babc
Name: imap.ge.xfinity.com
Address: 2001:558:fc11:9:f816:3eff:fe87:c172
Name: imap.ge.xfinity.com
Address: 2001:558:fc11:9:f816:3eff:fee6:7a57
Name: imap.ge.xfinity.com
Address: 2001:558:fc11:9:f816:3eff:fe0f:a4a
Name: imap.ge.xfinity.com
Address: 2001:558:fc11:2:f816:3eff:fec7:cb93
Name: imap.ge.xfinity.com
Address: 2001:558:fee2:1000:f816:3eff:fe42:4f14
Name: imap.ge.xfinity.com
Address: 2001:558:fc18:0:f816:3eff:fe33:9aaa
Name: imap.ge.xfinity.com
Address: 2001:558:fc18:0:f816:3eff:feb2:8c0d
Name: imap.ge.xfinity.com
Address: 2001:558:fc18:0:f816:3eff:fef1:25a5
Name: imap.ge.xfinity.com
Address: 2001:558:fc18:0:f816:3eff:febd:320a
Name: imap.ge.xfinity.com
Address: 2001:558:fc18:0:f816:3eff:fe36:aba3
Name: imap.ge.xfinity.com
Address: 2001:558:fc18:0:f816:3eff:fe3f:76f2
Name: imap.ge.xfinity.com
Address: 2001:558:fc18:0:f816:3eff:fe45:1d1e
tom@deathstar:~$ dig mail.comcast.net
; <<>> DiG 9.11.4-3ubuntu5-Ubuntu <<>> mail.comcast.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15037
;; flags: qr rd ra; QUERY: 1, ANSWER: 17, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;mail.comcast.net. IN A
;; ANSWER SECTION:
mail.comcast.net. 15 IN CNAME imap.ge.xfinity.com.
imap.ge.xfinity.com. 12 IN A 96.117.3.119
imap.ge.xfinity.com. 12 IN A 96.117.3.96
imap.ge.xfinity.com. 12 IN A 96.117.3.143
imap.ge.xfinity.com. 12 IN A 96.117.3.145
imap.ge.xfinity.com. 12 IN A 96.117.3.129
imap.ge.xfinity.com. 12 IN A 96.117.3.148
imap.ge.xfinity.com. 12 IN A 96.117.3.201
imap.ge.xfinity.com. 12 IN A 96.117.3.136
imap.ge.xfinity.com. 12 IN A 96.118.133.238
imap.ge.xfinity.com. 12 IN A 96.117.3.128
imap.ge.xfinity.com. 12 IN A 96.117.3.144
imap.ge.xfinity.com. 12 IN A 96.117.2.238
imap.ge.xfinity.com. 12 IN A 96.117.3.110
imap.ge.xfinity.com. 12 IN A 96.117.3.140
imap.ge.xfinity.com. 12 IN A 96.117.3.154
imap.ge.xfinity.com. 12 IN A 96.117.3.132
;; Query time: 13 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Tue Nov 20 06:58:31 PST 2018
;; MSG SIZE rcvd: 334
tom@deathstar:~$
Before November 19, 2018, everything was working fine. The initial
indication there was a problem was Mozilla Thunderbird failed to
connect to Comcast's POP3 mail server. Once I did some investigation,
I found the information above.
I have since disabled system-resolved and have installed "Unbound".
After installing "Unbound", I'm able to ping "mail.comcast.net"
without issue and Mozilla Thunderbird can contact successfully
Comcast's POP3 mail servers.
I started a thread about this on Ubuntuforums.org:
https://ubuntuforums.org/showthread.php?t=2406399
and others report being impacted by this as well.
Let me know if more information is needed! Thanks!
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