Hi,
I had the same problem and maybe I’ve found a solution.
I had a look on the Status / Debug Info at the plugins general tab (Settings > Link Checker > General). There I saw that everything was “green” but Curl was marked as “not installed”.
I just installed the php5-curl package and restarted my web server:
# apt-cache search php5-curl
php5-curl - CURL module for php5
# apt-get install php5-curl
After that I reloaded the Status / Debug Info and finally Curl showed up as installed. My server runs on Ubuntu but I’m sure there has to be a similar package on all other platforms.
Finally, to be sure, I forced all links to be rechecked (the option to force a recheck is at the end of the Settings > Link Checker > Advanced Tab) and I did not get any broken https links since yesterday.
Hope this may help. Please let me know if this finally worked for you.
Best regards,
Eric Janz
That my friend is the answer!
All I needed to do was:
apt-get install php5-curl
The page you reference “Settings > Link Checker > General” I simply don’t remember existing back when I installed this module – hopefully now no one will struggle with it!
Thanks for posting!