Exchange Mail - Connection Timeout

[evonet]

Hello friends,

I am having an interesting problem.

My server can send mail to other email providers without a problem.

25. My port is open.

When I try to send mail to Exchange Online users, it says in the exim logs:

domain-com.mail.protection.outlook.com [104.47.11.74] Connection timed out

I contacted Microsoft and they said my ip address is not on a blacklist.

Where do you think the problem is? I need your help.

 

[evonet]

Update: Connection timed out when I try to telnet to 104.47.11.74

 

[Zhenyapan]

check MTR to see where it is blocked
mtr -n 104.47.11.74

 

[evonet]

Hello,

The result is as in the picture.

 

[Zhenyapan]

So block not from your side, ask who owns 104.44.42.222, it's microsoft. You can send them this screen.

 

[evonet]

Are you saying that the problem is caused by microsoft?

So block not from your side, ask who owns 104.44.42.222, it's microsoft. You can send them this screen.

Kind regards.

 

[Zhenyapan]

as you provided - traffic brokes after this IP, so it's last who receives your traffic and this IP belongs to microsoft, you can check WHOIS for this IP

 

[zEitEr]

I've got on my side:

# traceroute -I 104.47.11.74
traceroute to 104.47.11.74 (104.47.11.74), 30 hops max, 60 byte packets
 1  * * *
 2  10.80.9.0 (10.80.9.0)  1.073 ms  1.060 ms  1.060 ms
 3  138.197.249.104 (138.197.249.104)  1.142 ms  1.143 ms  1.141 ms
 4  138.197.251.130 (138.197.251.130)  1.039 ms  1.011 ms  1.029 ms
 5  138.197.249.217 (138.197.249.217)  1.040 ms  1.040 ms  1.039 ms
 6  igblmdistc7504.uk.msft.net (195.66.224.140)  1.985 ms  1.450 ms  1.495 ms
 7  ae26-0.icr02.lon24.ntwk.msn.net (104.44.239.107)  2.372 ms  2.369 ms  2.360 ms
 8  be-122-0.ibr02.lon24.ntwk.msn.net (104.44.21.117)  111.969 ms  111.990 ms  111.982 ms
 9  be-6-0.ibr02.dub08.ntwk.msn.net (104.44.30.59)  11.718 ms  11.710 ms  11.736 ms
10  ae124-0.icr03.dub08.ntwk.msn.net (104.44.23.173)  11.596 ms  10.970 ms  11.214 ms
11  * * *
12  * * *
13  * * *
14  * * *
15  * * *
16  * * *
17  * * *
18  * * *
19  * * *
20  * *^C

at the same time:

# telnet 104.47.11.74 25
Trying 104.47.11.74...
Connected to 104.47.11.74.
Escape character is '^]'.
220 DB5EUR02FT030.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Mon, 21 Nov 2022 08:30:46 +0000
^]
telnet> Connection closed.

So traceroute and mtr are not reliable in such a case.

25. My port is open.

in order to be deadly sure, you might completely disable firewall and try it again.

 

[evonet]

Benim tarafımda var:

[kod]# traceroute -I 104.47.11.74
104.47.11.74 (104.47.11.74) için traceroute, maks. 30 sekme, 60 bayt paketler
1 * * *
2 10.80.9.0 (10.80.9.0) 1,073 ms 1,060 ms 1,060 ms
3 138.197.249.104 (138.197.249.104) 1,142 ms 1,143 ms 1,141 ms
4 138.197.251.130 (138.197.251.130) 1,039 ms 1,011 ms 1,029 ms
5 138.197.249.217 (138.197.249.217) 1,040 ms 1,040 ms 1,039 ms
6 igblmdistc7504.uk.msft.net (195.66.224.140) 1,985 ms 1,450 ms 1,495 ms
7 ae26-0.icr02.lon24.ntwk.msn.net (104.44.239.107) 2,372 ms 2,369 ms 2,360 ms
8 be-122-0.ibr02.lon24.ntwk.msn.net (104.44.21.117) 111.969 ms 111.990 ms 111.982 ms
9 be-6-0.ibr02.dub08.ntwk.msn.net (104.44.30.59) 11,718 ms 11,710 ms 11,736 ms
10 ae124-0.icr03.dub08.ntwk.msn.net (104.44.23.173) 11,596 ms 10,970 ms 11,214 ms
11 * * *
12 * * *
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * *^C
[/kod]

aynı zamanda:

[kod]# telnet 104.47.11.74 25
104.47.11.74 deneniyor...
104.47.11.74'e bağlandı.
Çıkış karakteri '^]'.
220 DB5EUR02FT030.mail.protection.outlook.com Microsoft ESMTP MAIL Hizmeti 21 Kasım 2022 Pazartesi 08:30:46 +0000'de hazır
^]
telnet> Bağlantı kapatıldı.
[/kod]


Yani traceroute ve mtr böyle bir durumda güvenilir değildir.



Son derece emin olmak için güvenlik duvarını tamamen devre dışı bırakıp tekrar deneyebilirsiniz.

Hello

I closed it with csf -x but the situation is the same.

 

[zEitEr]

You might contact your server provider, they might clarify.