[SOLVED] TCP fortune example didn't work properly on Centos

ms_tensai

hallo,

i tried to ran both fortuneclient and fortuneserver example on centos in different pc. when i connected fortuneclient application to fortuneclient application, i got error QAbstractSocket::NetworkError. Then, i tried to ran fortuneclient application on centos and fortuneserver application on ubuntu and everything work properly.

is anyone know why?

i am using Qt 4.74 version

thanks
Miftah

tobias.hunger

Do you have a portfilter/firewall set up on centos?

ms_tensai

yes, i have my firewall turned on. Then, i tried to turned it off and everything work properly now.

But, i wonder is there any risk if i turned firewall off?

thanks
Miftah

tobias.hunger

Without a firewall everybody (depending on your setup that is "everybody in your local network" or "everybody on the internet") can connect to any open port on your machine

If you have the firewall on, then only those ports the firewall allows through can be reached from outside your machine. That will of course stop any network services you set up on your machine from working (e.g. the fortuneserver).

Of course you can also configure the firewall allow certain ports while blocking others.