Ubuntu linkchecker dies instantly with "503 service unavailable"

sundialsvcs · 04-05-2018, 09:44 AM

In less than 0.1 seconds, Ubuntu's linkchecker stops while crawling my local site, and I can't really see what's causing it.

Code:

Check time 0.046 seconds
Size       299B
Result     Error: 503 Service Unavailable

Statistics:
Downloaded: 0B.
Content types: 0 image, 1 text, 0 video, 0 audio, 0 application, 0 mail and 0 other.
URL lengths: min=26, max=26, avg=26.

I can wget the home page of the site (which is 119K) without difficulty, but the link-checker stops cold without saying that it read more than, I think, 299 bytes. I've tried disabling threading or sharply curtailing it using command-line options with no positive effect. Basically, I don't seem to be able to get a handle on it to begin to diagnose it.

sundialsvcs · 04-05-2018, 09:49 AM

Update: When run against the public (dot-com) version of the site, the link checker does appear to operate. I am able, also, to navigate to the local site with a web browser and to interact with it normally. So, there must be something fundamentally different/wrong with my offline-test environment – an Ubuntu VM running Apache and able to serve the site to a web browser but not to linkchecker.