API calls to Red Hat Satellite 6 fail intermittently on LDAP authentication

Issue

• Error while connecting to LDAP server after upgrade from Red Hat Satellite 6.11 to 6.12.

• When running various API calls from various user accounts to Satellite, they sometimes fail with:

  { "error": { "message": "ERF77-7629 [Foreman::LdapException]: Error while connecting to 'server.com' LDAP server at 'ldap.example.com' during authentication ([Net::LDAP::Error]: Connection reset by peer - SSL_connect)" } }
  

• The same issue was observed on Red Hat Satellite 6.13 with Active Directory (running on Windows Server 2016) configured as an external authentication source.