Christian,

Thanks for your response! After a second look, the perceived bug was 
actually a combination of two non-Prometheus issues:

- Other firewall rules were preventing connections to port 9090.
- I misread netstat's output- Prometheus was binding to port 9090 for all 
IPv6 addresses and _implicitly_ binding in IPV4 (this binding isn't printed 
in netstat!)

Hope you and yours are well,
John

On Wednesday, August 5, 2020 at 6:23:03 AM UTC-4, Christian Hoffmann wrote:
>
> Hi, 
>
> On 8/4/20 3:23 PM, jumble wrote: 
> > Latest prometheus, on RHEL8. 
> > 
> > Observed behavior: bound to |127.0.0.1:9090| 
>
> This sounds unexpected. Are you using the official binaries from 
> prometheus.io / github? 
>
> Can you share the exact logs from your experiments? 
>
> Is it possible that you've got multiple Prometheus installations, i.e. 
> one that is already running (bound to localhost) and the one where you 
> tried to run experiments? 
>
> I suggest checking the process list (ps aux | grep prometheus), watching 
> the logs for "address already in use" messages and/or trying a different 
> port. 
>
> It would be really surprising if this was a bug in Prometheus, Go or 
> RHEL8. But who knows :) 
>
> Kind regards, 
> Christian 
>

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