After an administrator installs the Cisco jabber Client, it fails to register with the cisco UCM server. Which two actions should be taken to troubleshoot this problem? (Choose two.)

The LMHOST file is a legacy Windows file for NetBIOS name resolution and is not used by Cisco Jabber for discovering Cisco UCM or other services.

Cisco Jabber clients typically use DNS SRV records (e.g., `_cisco-uds._tcp.example.com`) to discover the IP addresses of Cisco UCM servers and other necessary services for registration and functionality. Incorrect or missing SRV records will prevent Jabber from finding its services.

Corporate firewalls often block specific ports or protocols. Jabber requires various ports open for communication with Cisco UCM, Expressway, and other services (e.g., SIP, HTTPS, XMPP, RTP), and blocked ports would prevent successful registration.

While Layer 3 connectivity is fundamental, verifying it 'on the gateway' is too specific; general network connectivity from the client to UCM is relevant, but a gateway-specific check is not the primary action for client registration issues.

Rebooting the Cisco Unified Border Element (CUBE) Gateway is largely irrelevant to a Jabber client's inability to register with Cisco UCM unless the CUBE has a specific misconfiguration affecting client registration, which is not its primary role.