NVP vProxy: Registration fails with "vProxy in unstable state, method not allowed. Received an HTTP code: 405"

The NetWorker VMware Protection integration is configured with the vProxy Appliance.  The vProxy is being registered, and the NetWorker Management Console shows an HTTP warning code 405.

Warning    HH:MM:SS  event    vm proxy  Unable to register NSR VMware proxy '[VPROXY_NAME]': vProxy in unstable state, method not allowed. Received an HTTP code: 405, libCURL message: "", url: "https://[NETWORKER_SERVER_NAME]:9090/api/v1/VproxyEngines/RestEngine/Registration"

The vProxy /opt/emc/vproxy/runtime/logs/vrapid/vrapid-engine.log shows:

YYYY/MM/DD HH:MM:SS TRACE:  rejecting unauthorized request "/api/v1/VproxyEngines/RestEngine/process":
YYYY/MM/DD HH:MM:SS TRACE:  {"Config": {"LogTag": "28", "Username": "admin", "SessionId": "", "IdleTimeout": 300, "LogLevel": "INFO", "Password": "*****", "NWS": "[NETWORKER_SERVER_NAME]", "Cp": "-----BEGIN CERTIFICATE-----\nMIICwD....\n-----END CERTIFICATE-----\n-----BEGIN RSA PRIVATE KEY-----\n.....==\n-----END RSA PRIVATE KEY-----\n", "MobServer": {"HostName": "[VCENTER_SERVER_NAME]", "UserName": "[VCENTER_USER]", "UserPassword": "*****", "TcpPort": 0}}}
YYYY/MM/DD HH:MM:SS ERROR:  AdminEngine: sending response error: code=401, errText=only requests from [NETWORKER_SERVER_NAME] are allowed
YYYY/MM/DD HH:MM:SS TRACE:  rejecting unauthorized request "/api/v1/VproxyEngines":
YYYY/MM/DD HH:MM:SS ERROR:  AdminEngine: sending response error: code=401, errText=only requests from [NETWORKER_SERVER_NAME] are allowed

If the NetWorker server has multiple network interfaces, the vProxy may see another interface and deny the registration.

Use one of the following workaround options:

Workaround 1:

1. Connect to the vProxy appliance over SSH as admin.
2. Switch to root: sudo su - root
3. Edit the systemd unit config file: vi /usr/lib/systemd/system/vrapid.service
4. Find the line starting with "ExecStart=/opt/emc/vproxy/bin/vrapid"
5. Append/edit command-line arg to disable access control. 6. Reload the unit config file into systemd: systemctl daemon-reload
7. Restart the vrapid engine: systemctl restart vrapid.service
8. Register the vProxy with the NetWorker server.

Workaround 2:

Configure DNS entries for all the NetWorker Server interface IP addresses to resolve to the NetWorker Server hostname.  The vProxy registration resolves all the IP addresses for the NetWorker Server and add them to the access control list.

Workaround 3:

Edit the vProxy /etc/hosts file prior to registration and add all the NetWorker Server interface IP addresses to resolve to the NetWorker Server hostname.