I have fedora 22, networks works fine I can browse internet, I can ping....
Recently, I setup evolution email client, whenever I do "send/Receive" I get an error saying
Reading some articles on this side for similar issues, one recommended to do a telnet, here I discovered that doing
sends back the same error

I run the exact same telnet commend from a windows machine n the ame subnet, same DNS, same gateway, it works fine telnet and pop, smtp protocol.
I checked fedora firewall, PO3s is checked in the public zone.
Am I missing something?
N.B : while I was checking firewall, I noticed that it is POP3s not POP3, is it the same thing or should it be POP3 and there is something wrong in my setup?
Thanks for your help

maybe try dig or nslookup
are you sure that's a valid name address?

In fact, I have just discovered that whatever server I ping, I get the exact same error message

Yes more than sure, as I said, I do telent from a windows machgine with exactlt same nertwork config and everything works fine

Try a traceroute (tracert on Windows) and pipe the output to files, then compare the two files. That might give you some clues as to where the connection is failing.

You may have to use the "m" argument with traceroute. See man traceroute for more.

I think this is related to DNS issue.

Thanks, yes it was DNS issue

It basically had to be "a DNS issue." To resolve any address, the system looks at /etc/hosts and then it starts issuing requests to a list of DNS servers. That's how "linuxquestions.org" gets resolved to an IP-address of one of its servers.

a bit of a WARNING
--


if you are going to use fedora then STAY current !!!
install Fedora 27

you are 5 versions out of date and missing a few YEARS of security fixes

What was the solution? I and others, esp. future searchers/readers very much want to know.
Then, you can mark Thread as 'Solv'd'. Thank you eliassal.