Netbox slow response times without internet connectivity
Date: 01 Aug 2026
This was an issue that puzzled me for a couple of hours before figuring out what was wrong. The below HTTP duration graph shows an obvious problem with the response times for netbox, taking up to 10 seconds.
I initially thought this had something to do with migrating the host running my Netbox service.
But after testing and validating all components used: Nginx, Redis, Postgres none of them showed signs of causing this latency.
Looking at the time this became an issue it occured to me, it was the same time I disabled internet connectivity for this server. So re-enabling internet connectivity verified what caused the issue, now I needed to figure out why it was requiring internet access.
RELEASE_CHECK_URL
According to the docs this is disabled by default Default: None (disabled) Docs: release_check_url.
But for some reason it was default enabled in the env/netbox.env file in the netbox-community/netbox-docker repo.
RELEASE_CHECK_URL=https://api.github.com/repos/netbox-community/netbox/releases
So setting this to RELEASE_CHECK_URL=None in the docker-compose.yml fixed the issue and I can now disable internet connectivity yet again,
without slow response times from Netbox