问题
I tried this solution:
iptables -I OUTPUT -p tcp --dport 2195 -j ACCEPT
/etc/init.d/iptables stop
/etc/init.d/iptables start
but still can't access the port.
If there are more ports that I have to open for APNS let me know.
回答1:
How about:
iptables -A INPUT -p tcp --dport 2195 -j ACCEPT
service iptables restart
This may help too.
回答2:
See my anwser here: https://stackoverflow.com/a/25229943/1472048
For CentOS 7, you should use "firewall-cmd" command like so:
firewall-cmd --add-port=2195/tcp --permanent
iptables is not recommended if you use the firewalld service.
回答3:
It didn't work for me completely, since my last rule was DROP ALL which basically negated all I added to iptables after.
It might be useful to use the -I switch:
iptables -I INPUT 1 -p tcp --dport 2195 -j ACCEPT
The INPUT 1 - means 1st Input rule instead of appending, to put rule in front of drop all
回答4:
Try the following command, it worked for me:
$ sudo iptables -A INPUT -p tcp --jport 2195 -j ACCEPT
$ sudo /etc/init.d/iptables save
来源：https://stackoverflow.com/questions/13606582/how-to-open-port-2195-in-iptables-centos-6-for-activating-the-apns