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[user@host ~]$ cat /etc/redhat-release
Red Hat Enterprise Linux Server release 6.8 (Santiago)

[user@host ~]$ curl -L https://install.perlbrew.pl | bash

curl: (60) Peer certificate cannot be authenticated with known CA cert
+ificates
...
 not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
 the -k (or --insecure) option.

[user@host ~]$ curl -kL https://install.perlbrew.pl | bash
  % Total    % Received % Xferd  Average Speed   Time    Time     Time
+  Current
                                 Dload  Upload   Total   Spent    Left
+  Speed
...
 not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
 the -k (or --insecure) option.

[user@host ~]$ wget -O - https://install.perlbrew.pl | bash
--2019-03-06 10:58:43--  https://install.perlbrew.pl/
Resolving install.perlbrew.pl... 64.62.231.202
...
ERROR: cannot verify install.perlbrew.pl’s certificate, issued by “/DC
+=com/DC=<my_domain>/DC=<my_domain>/CN=<my_domain> Enterprise Root CA”
+:
  Self-signed certificate encountered.
To connect to install.perlbrew.pl insecurely, use ‘--no-check-certific
+ate’.