Nagios Support Forum

Attemp to install the linux-nrpe-agent on a linux 5.5 server in a web farm behind a firewall is failing on the prerequisites
Running './1-prereqs'...
Installing prerequisites...
Loaded plugins: rhnplugin, security
Error: Cannot retrieve repository metadata (repomd.xml) for repository: epel. Please verify its path and try again
Could not retrieve mirrorlist http://mirrors.fedoraproject.org/mirror ... rch=x86_64 error was
[Errno 4] IOError: <urlopen error (101, 'Network is unreachable')>
RESULT=1

Got this back from an earlier Topic post on FW port requirements.
It really depends on how you will be monitoring them, as Windows machines can be monitored with
NSClient++ standard - 12489
NRPE - 5666
SNMP 161

Linux machine are often monitored with:
NRPE - 5666
SSH - 22

Also, Nagios can receive passive checks from either type of machine on
NSCA - 5667
NRPE - 80 or 443

Firewall rules were enabled based on these ports, can someone tell me what I am missing?

Thank You

This looks like yum cannot reach the mirror list...

Does this computer have a connection to the Internet?

yes, but as I mentioned it is behind a firewall, had ports opened for YUM to Redhat but did not know anything about the need to rreach a mirror list.

What exactly is this, I guess I will need to have access opened forthis also, is port 80 sufficient?

Thank You

Yes, port 80 is sufficient, this is a mirror list for the epel repository

Do I need a rule for every link in this list?
Or just this one
http://mirrors.fedoraproject.org/mirror ... rch=x86_64

Can you briefly explain the requirement for this mirror?

Thank You

Yes, you would need one for each.

The Epel repo is required by the Linux agent to install the following packages