What does the "XMPP Status" mean on the network status sheet?

• XMPP Status	Meaning
  None	XMPP Status may have stopped due to an HTTPS connection error. Please check the HTTPS Status.
  DNS Server Not Found	Failed to access to the DNS server. Please check your Internet connection is working correctly and DNS server settings of your printer are correct.
  Domain Name Not Resolved	Failed to resolve the DNS domain name. Please contact your network administrator for assistance.
  Proxy Server Not Found	Proxy Server Not Found
  Rejected by Proxy Server	Failed to connect to the proxy server. Please confirm whether an XMPP (5222) port is open.
  XMPP Server Not Found	Your internet connection or Epson Connect Email Print is temporarily unavailable.
  Server Error	Epson Connect Email Print is currently unavailable.