When attempting to register a system to Red Hat Satellite or Capsule, the subscription-manager registration process may fail with a "Network error, unable to connect to server" message.

Issue

• When attempting to register a system with Red Hat Satellite or Capsule using the subscription-manager command, the registration process may fail with the error message Network error, unable to connect to server.
• The registration of a new virtual machine to the Red Hat Satellite 6 server cannot be completed.
• Encountering certificate issues while attempting to establish a connection to our Red Hat Satellite 6 server.
• Encountering a network error while attempting to register the host using subscription-manager.

• The registration of the system to Red Hat Satellite or Capsule was unsuccessful, and the error message "Network error, unable to connect to server" was displayed by the subscription-manager command.

  #  subscription-manager register --org="Test" --activationkey="Test_AK"
  Network error, unable to connect to server. Please see /var/log/rhsm/rhsm.log for more information.
  

  2023-03-30 08:41:41,505 [ERROR] subscription-manager:11683:MainThread @managercli.py:218 - Error during registration: [Errno 104] Connection reset by peer
  2023-03-30 08:41:41,505 [ERROR] subscription-manager:11683:MainThread @managercli.py:219 - [Errno 104] Connection reset by peer
  File "/usr/lib64/python3.6/ssl.py", line 648, in do_handshake
  self._sslobj.do_handshake()
  ConnectionResetError: [Errno 104] Connection reset by peer
  

  2023-03-30 13:44:50,030 [ERROR] subscription-manager:639256:MainThread @managercli.py:218 - Error during registration: [Errno -2] Name or service not known
  2023-03-30 13:44:50,031 [ERROR] subscription-manager:639256:MainThread @managercli.py:219 - [Errno -2] Name or service not known
    File "/usr/lib64/python3.6/socket.py", line 704, in create_connection
  for res in getaddrinfo(host, port, 0, SOCK_STREAM):
   File "/usr/lib64/python3.6/socket.py", line 745, in getaddrinfo
  for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
  

  2023-03-30 10:39:14,592 [ERROR] @managercli.py:101 - Error during registration: [Errno 110] Connection timed out
  2023-03-30 10:39:14,592 [ERROR] @managercli.py:102 - [Errno 110] Connection timed out
  

  2023-03-30 00:15:22,004 [ERROR] subscription-manager:5280:MainThread @managercli.py:217 - Error during registration: ('_ssl.c:602: The handshake operation timed out',)
  2023-03-30 00:15:22,005 [ERROR] subscription-manager:5280:MainThread @managercli.py:218 - ('_ssl.c:602: The handshake operation timed out',)
  

    File "/usr/lib64/python3.6/ssl.py", line 648, in do_handshake
  self._sslobj.do_handshake()
  ssl.SSLError: [SSL: NO_CIPHERS_AVAILABLE] no ciphers available (_ssl.c:897)