Red Hat Satellite Capsule 6 status shows as "error certificate verify failed (unable to get local issuer certificate)" on webUI

Issue

• Red Hat Capsule 6 status shows below error message on the Red Hat Satellite WebUI portal :

  SSL_connect returned=1 error=0 state=error: certificate verify failed (unable to get local issuer certificate)
  

• Installer fails on Red Hat Capsule with the below error, How to fix it?

  [ERROR 2022-05-10T10:54:55 main]  /Stage[main]/Foreman_proxy::Register/Foreman_smartproxy[capsule.example.com]/ensure: change from 'absent' to 'present' failed: Proxy capsule.example.com cannot be registered: Unable to communicate with the Capsule: ERF12-2530 [ProxyAPI::ProxyException]: Unable to detect features ([Net::HTTPServerException]: 403 "Tunnel or SSL Forbidden") for Capsule https://capsule.example.com:9090/v2/features Please check the Capsule is configured and running on the host. 
  

  2022-06-02 10:04:31 [ERROR ] [configure] /Stage[main]/Pulp::Database/Exec[migrate_pulp_db]/returns: change from 'notrun' to ['0'] failed: 'pulp-manage-db' returned 70 instead of one of [0]
  
  2022-06-02 10:05:33 [ERROR ] [configure] Proxy capsule.example.com cannot be registered: Unable to communicate with the Capsule: ERF12-2530 [ProxyAPI::ProxyException]: Unable to detect features ([RestClient::Exceptions::ReadTimeout]: Timed out reading data from server) for Capsule https://capsule.example.com:9090/v2/features Please check the Capsule is configured and running on the host.
  2022-06-02 10:05:33 [ERROR ] [configure] /Stage[main]/Foreman_proxy::Register/Foreman_smartproxy[capsule.example.com]/ensure: change from 'absent' to 'present' failed: Proxy capsule.example.com cannot be registered: Unable to communicate with the Capsule: ERF12-2530 [ProxyAPI::ProxyException]: Unable to detect features ([RestClient::Exceptions::ReadTimeout]: Timed out reading data from server) for Capsule https://capsule.example.com9090/v2/features Please check the Capsule is configured and running on the host.
  

• Updating External CA-signed SSL certificates on Red Hat Capsule fails on the below error.

  2022-05-04 13:41:14 [ERROR ] [configure] /Stage[main]/Foreman_proxy::Register/Foreman_smartproxy[capsule.example.com]: Error making PUT request to https://capsule.example.com/api/v2/smart_proxies/2/refresh: Response: 500 Internal Server Error: Check /var/log/foreman/production.log on capsule.example.com for detailed information