I just posted a new thread a couple of minutes ago that had one link to some of the official InfluxData documentation (specifically to the JoinNode page). However, when I tried posting the thread, the UI alerted me that I was not allowed to post links to that host. When I removed the link to the documentation, my thread posted successfully.
This wasn’t meant to happen intentionally, was it? I figured this was likely an oversight on protecting the forums from spam. Perhaps a whitelist could be allowed to anything from an influxdata.com site.