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I set up my Linux firewall but it doesn't work to let my email-client connect to the server when the rule "drop everything" is activated. I also changed the order of the rules with no effect. Here is the configuration:
iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT tcp -- anywhere anywhere tcp dpt:webmin
ACCEPT tcp -- anywhere anywhere tcp dpt:imaps
ACCEPT tcp -- anywhere anywhere tcp dpt:submission
ACCEPT tcp -- anywhere anywhere tcp dpt:urd
ACCEPT tcp -- anywhere anywhere tcp dpt:https
ACCEPT tcp -- anywhere anywhere tcp dpt:imap2
ACCEPT tcp -- anywhere anywhere tcp dpt:http
ACCEPT udp -- anywhere anywhere udp dpt:domain
ACCEPT tcp -- anywhere anywhere tcp dpt:domain
ACCEPT tcp -- anywhere anywhere tcp dpt:smtp
ACCEPT tcp -- anywhere anywhere tcp dpt:ssh
ACCEPT tcp -- anywhere anywhere tcp dpt:ftp
DROP all -- anywhere anywhere
Do you have any idea what's the reason for that?
opa-rudi
Posted 2019-02-17T09:06:41.743
Reputation: 1
Do you have an OUTPUT or FORWARD chain at all? All I see here is an INPUT chain, which wouldn't be able to see a response (since the server can't send) – Canadian Luke – 2019-02-17T17:13:45.563
Yes. I have declared them:
Chain FORWARD (policy ACCEPT)
DROP all -- anywhere anywhere
Chain OUTPUT (policy ACCEPT)
ACCEPT all -- anywhere anywhere – opa-rudi – 2019-02-17T20:56:48.350