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I have 2 PC (the second is a clone of first) running centos 7. From one is not possible to send mail. I did some tests and the result is this:

[root@PC2]# telnet smtps.aruba.it 465
Trying 62.149.156.218...
Connected to smtps.aruba.it.
Escape character is '^]'.

[root@PC1]# telnet smtps.aruba.it 465
Trying 62.149.128.218...
telnet: connect to address 62.149.128.218: No route to host
Trying 62.149.156.218...
telnet: connect to address 62.149.156.218: No route to host

PC1 returns "no route to host" but on the (global network) firewall I log packets that exit from PC1 to host. All network configurations are the same in the subnet. What else can be the problem?

enter image description here

And more, if I try to connect to port 25 (that i know is NOT allowed) I receive allways double message:

[root@PC1]# telnet smtps.aruba.it 25
Trying 62.149.156.218...
telnet: connect to address 62.149.156.218: Connection refused
Trying 62.149.128.218...
telnet: connect to address 62.149.128.218: No route to host

while on other pc I have the right behavior

[root@PC2]# telnet smtps.aruba.it 25
Trying 62.149.156.218...
telnet: connect to address 62.149.156.218: Connection refused
Trying 62.149.128.218...
telnet: connect to address 62.149.128.218: Connection refused
user3442473
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1 Answers1

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This may be due to firewall settings. You can configure it or completely disable (Please, don't do that)

Here you can find the setup manual

Grigory Skvortsov
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  • Hi, 2 pc have teh same firewall rule. I also tried to disable firewall just for be sure that is not pc firewall the problem. – user3442473 Nov 28 '19 at 14:48