Nagios Support Forum

Posted: **Wed Oct 18, 2017 9:20 am**

In our test Nagios XI environment we have implemented several security changes with apache including switching to only allow TLS1.1 & 1.2.

After the change we have noticed several issues. The "Monitoring Engine Process" & "Monitoring Engine Event Queue" dashlets are displaying only errorrs("No Data", & "Error: No output from backend!"). Also when running an apply configuration the wait screen will just sit there spitting out ....s - I checked the /usr/local/nagiosxi/var/cmdsubsys.log and it is completing but is not getting any data from the backend to say its completed.

Once I re-enable TLSv1.0 these problems disappear and everything is back to normal. Our security team is forcing the change and we will have to disable TLSv1.0, and I need some help to correct these issues.

I am running Nagios XI v 5.2.3 on Red Hat Enterprise Linux Server release 6.7 (Santiago)

Posted: **Wed Oct 18, 2017 12:37 pm**

Hi @ daniel.ledford,

You will have to remove TLSv1.0 and configure TLS1.1 & 1.2..

Please let me know if you have any questions.

Posted: **Thu Oct 19, 2017 6:40 am**

We have already done that prior to the original post. We are only allowing TLSv1.1 & 1.2 on the server.

From the apache config:

Code: Select all

SSLProtocol -all +TLSv1.1 +TLSv1.2

Is there a config on the Nagios end to specify to only use TLSv1.1 or 1.2? We have successfully setup HTTPS through this guide:
https://assets.nagios.com/downloads/nag ... s%20XI.pdf

Posted: **Thu Oct 19, 2017 12:25 pm**

Hi @daniel.ledford,

Could you please check if port 443 is open on your firewall.

Do that by running the command below as root to show open ports on your firewall:

Code: Select all

firewall-cmd --list-all

Expected output:

Code: Select all

public (active)
  target: default
  icmp-block-inversion: no
  interfaces: ens160
  sources:
  services: dhcpv6-client ssh
  ports: 5666/tcp 161/tcp 80/tcp 5667/tcp 12489/tcp
  protocols:
  masquerade: no
  forward-ports:
  sourceports:
  icmp-blocks:
  rich rules:

Posted: **Thu Oct 19, 2017 12:32 pm**

After making the changes below,

daniel.ledford wrote:We have already done that prior to the original post. We are only allowing TLSv1.1 & 1.2 on the server.

From the apache config:
Code: Select all
SSLProtocol -all +TLSv1.1 +TLSv1.2
Is there a config on the Nagios end to specify to only use TLSv1.1 or 1.2? We have successfully setup HTTPS through this guide:
https://assets.nagios.com/downloads/nag ... s%20XI.pdf

Did you restart the httpd and nagios service to apply those changes?

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