Unable to add Indexer, Certification Validation Error

Sonarr version (3.0.3.644):
Mono version (6.4.0.198):
OS: Linux Ubuntu 18.04 LTS
Debug logs:
See:
https://pastebin.com/1JmkXPWP

Description of issue:
I am unable to add NZBgeek as an Indexer.
I already tried the solution of this post: Unable to add indexers to new install

but running following command didn’t resolve it form me: sudo cert-sync /etc/ssl/certs/ca-certificates.crt

After further investigation, I managed to resolve the problem.
My Firewall (Sophos UTM) was blocking the certificate & also the domain.

If you have the same problem try the following steps:

  1. Disable certificate checks under Sonarr -> Settings -> General: Certificate Validaten
  2. Try to add the inderxer again and check your logs
  3. Also try installing mono certificates package: ca-certificates-mono for more info check https://www.mono-project.com/download/stable/#download-lin
  4. You may have to run following command manually: sudo cert-sync /etc/ssl/certs/ca-certificates.crt

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