Proxy Error for Sonarr


So, I’m brand new to dealing with linux, so still a lot to learn.

I got QuickBox on my server, logged into the dashboard, and installed Sonarr successfully.

The issue is when I click on Sonarr it gives me a Proxy Error:

"Proxy Error

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /sonarr.

Reason: DNS lookup failure for: localhost"

So I’m lost here as to what to do to be able to access Sonarr (same issue for SABnzbd)





Could you please show us the return of this command please?

cat /etc/hosts (if error please use sudo)


This is what was returned:


Could you please try ping localhost and tell us the result?


This is the result:

ping: unknown host localhost


Okay so modify your /etc/hosts file (sudo nano /etc/hosts) and add this line : localhost

Retry to ping localhost and try to access Sonarr again.


Okay, that seems to have done the trick!

I added the line “ local host” directly under the line “

I did the “ping localhost” and it seemed to keep continually pinging, I’m not sure if that’s what is supposed to happen, but it kept returning a line

“64 bytes from ( icmp_seq=117 ttl=64 time=0.036 ms”

with the time different each time.

After that, I rebooted the server, logged into the Quickbox dashboard, tried Sonarr and it worked.


Well done :slight_smile:



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