The W3C Link Checker, when I entered http://cold32.com and allowed 10 levels of recursion (more than needed) and set it to send the Referer, reported error-500 for some URLs but I had no problem visiting those URLs:

from <http://cold32.com/2/health/3/pneumonia-colds-and-infections.htm>: <http://www.nia.nih.gov/health/publication/understanding-lung-problems#pneumonia>, yielding "Can't connect to www.nia.nih.gov:443" (www.nia.nih.gov:443 failed for me (my browser twice immediately reported that "[t]he connection was reset") but www.nia.nih.gov worked for me)

from <http://cold32.com/5/action/5/smoking-drinking-sex-pills-and-all-drugs.htm>: <https://www.cornellurology.com/clinical-conditions/erectile-dysfunction/drugs-for-erection-problems/>, yielding "Can't connect to www.cornellurology.com:443" (www.cornellurology.com:443 failed for me as error-404 but www.cornellurology.com worked for me)

For this bug report, I guessed the component and the version; the version is actually 4.81.