ERROR: SSL handshake to failed

Issue

Server registration check fails with the error :

# rhn_check
ERROR: SSL handshake to <RetryServer for xmlrpc.cln.cloudlinux.com/XMLRPC/> failed

This could signal that you are *NOT* talking to a server
whose certificate was signed by a Certificate Authority
listed in the /usr/share/rhn/CLN-ORG-TRUSTED-SSL-CERT file or that the
RHNS-CA-CERT file is invalid.

Environment

• RHN

Solution

Ensure that 107.155.119.76 isn't blocked

# ping xmlrpc.cln.cloudlinux.com

# mtr -n -r -c100 xmlrpc.cln.cloudlinux.com

and resolves to valid IP

#  host xmlrpc.cln.cloudlinux.com
xmlrpc.cln.cloudlinux.com has address 107.155.119.76

Reinstall rhn-client-tools:

# yum reinstall rhn-client-tools --enablerepo=cloudlinux*

Check settings in DNS setup:

# cat /etc/resolv.conf
; generated by /usr/sbin/dhclient-script
nameserver 8.8.8.8
nameserver 8.8.4.4