Recently, I noticed that all plugins have switched to the n/a status, when updating manually:
Checking connectivity ... No response, aborting!
I looked at the script that is responsible for checking plugins, there is a link wget --spider --no-check-certificate -nv -T10 -t1 https://www.msftncsi.com/ncsi.txt 2>&1|grep -o 'OK'
I tried to run it manually and got an error:
Unable to establish SSL connection.
Checked the route to www.msftncsi.com, everything looks fine.
date and time synchronized. dunno what to do
Sometimes doker containers in n/a status too
I had to disable plugin monitoring otherwise, when going to the plugins section, the infinite status "checking"
DNS is set to quad9