Server unresponsive

[rixanlu]

Hello.
My Fusion handles four Nagios Core servers. Three of them shows without problems.
The fourth shows as "Unable to retrieve the data from the local cache" in Tactical Overview, and as "Unresponsive" in Fused Server Credentials.
Credentials are correct, and the link from the server opens the servers local Nagios web interface without problems.
Nagios Fusion server can ping the "Unresponsive" server.
What to do?

[lmiltchev]

Does the fused server use SSL? Can you show us how the server is defined (under "Manage Fused Servers") in Fusion? (hide sensitive info - IP, etc.)
Did you check the "/etc/hosts" for issues (wrong syntax)?

[rixanlu]

The fused server does not use SSL.
/etc/hosts are untouched for both Fusion and fused server. The problem server is added by IP, not by FQDN, so /etc/hosts is not involved.
Fused server settings are attached.

[slansing]

Is port redirection set up automatically on that server? Try removing the port from the end, as well as /nagios3/, change that to /nagios, unless that is something you altered in Apache personally.

[rixanlu]

There is no port redirection on the problem server, it responds on port 80.
It is the firewall that NAT:s 5522 to 80. I need to NAT because port 80 is already in use on another server and I have only one external IP address.
Change to /nagios didn't work - page not found.
The URL from the screenshot is correct - it works perfectly when you browse to it. It is just Fusion that doesn't see the page.

[rixanlu]

Update:

Just to test, I've removed the firewall rule that NAT:s external port 5522 to internal port 80 on the Nagios server, and just do straight port forwarding from external 80 to internal 80.
It works.
Given that the previous configuration had no problems in a web browser, there must be something in Fusion that has a problem with NAT.

[lmiltchev]

Given that the previous configuration had no problems in a web browser, there must be something in Fusion that has a problem with NAT.

Did you mean this setup used to work with a previous version of Nagios Fusion? Can you elaborate?

[rixanlu]

No, I meant that I had no problems browsing to the Nagios site with Chrome, Firefox, IE etc on port 5522. It's just Fusion which can't see the site.

[abrist]

It's just Fusion which can't see the site.

Given that the previous configuration had no problems in a web browser, there must be something in Fusion that has a problem with NAT.

I agree. It could be that Fusion is having issues with a non standard port assignment, or that it truly has issues with the NAT. Do you have any other Fusion servers using a non-standard port?

[rixanlu]

I agree. It could be that Fusion is having issues with a non standard port assignment, or that it truly has issues with the NAT. Do you have any other Fusion servers using a non-standard port?

No, this is the only one.