The SSL certificate check for
stat.ethz.ch fails. Given that it is actually valid (see below), the problem is on your end. Possible causes are
a) intermittent issue - try again or try another mirror
b) too old macOS with expired root certificates - see
https://stat.ethz.ch/pipermail/r-sig-mac/2021-November/014228.html
c) bad proxy - remove the proxy or contact the proxy administrator
d) someone is messing with your network - worry
Cheers,
Simon
Certificate:
Data:
[...]
Issuer: C = US, O = Let's Encrypt, CN = R3
Validity
Not Before: Feb 25 03:44:39 2022 GMT
Not After : May 26 03:44:38 2022 GMT
Subject: CN =
stat.ethz.ch