TCP status gets stuck false when cached

[anthonybilinski]

My node tox.abilinski.com was hit with this on nodes.tox.chat. I've managed to repro the case locally, and removing nodes.json fixes the issue. It seems like if I, from a clean state:

1. Disable UDP in my firewall
2. Run toxstatus long enough to generate nodes.json
3. Stop toxstatus, enable UDP in my firewall
4. Run toxstatus

Then the status page will indefinitely show:

Unable connect to this node through UDP. A TCP relay seems to be up and running, however.

It seems like there's an issue with cache invalidation from nodes.json, but I haven't looked into it too much yet. Now that I have a local repro I'll try to look into it, just opening this issue to help keep notes in case someone else knows something about it or in case I don't come back to it, but for the time being I plan on investigating this soon.