PowerProtect: Não é possível implementar o VM Direct Protection Engine devido a uma falha de inicialização

O equipamento PowerProtect Data Manager é usado para proteger o ambiente vSphere com a solução VM Direct Engine. A implementação do VM Direct Engine em um cluster de zona desmilitarizada (DMZ) falha durante a fase de inicialização. O status do trabalho do sistema mostra:

ProxySession unsuccessful during initialization. Unable to deploy and verify the vProxy my-proxy.my-domain.com. Unable to query vProxy status after 'Deploy'. Request unsuccessful. Unable to connect to External vproxy 'my-proxy.my-domain.com' on port '9090', the host service is not running.

Action : Deploy
TransportMode : HotaddPreferred
Vproxy : my-proxy.my-domain.com
Error : ProxySession unsuccessful during initialization. Unable to deploy and verify the vProxy my-proxy.my-domain.com. Unable to query vProxy status after 'Deploy'. Request unsuccessful. Unable to connect to External vproxy 'my-proxy.my-domain.com' on port '9090', the host service is not running. (0)
ProtectionType : VM
VproxyStatus : Failed

A coluna /var/log/brs/vmdm/vmdm.log programas:

YYYY-MM-DD20:37:02.229Z ERROR [] [vproxyMonitor] [][][][TRACE_ID:b28dabec92e4fcae][] [c.e.b.v.v.s.VPEProxyService.updateTask(809)] - Update VM Direct Protection Engine failed 40be4802-972d-416f-b131-43890b6c32ac ManagedProxySession(state=Failure, id=32a99bf2-1c6e-47e7-aff1-4b26b7026cc8, error: code=0, text=ProxySession unsuccessful during initialization.  Unable to deploy and verify the vProxy my-proxy.my-domain.com.  Unable to query vProxy status after 'Deploy'.  Request unsuccessful.  Unable to resolve External vproxy 'my-proxy.my-domain.com' IP address in DNS server(s).)

O equipamento PowerProtect não tem acesso ao VM Direct Engine pela porta 9090.

admin@ppdm:~> curl -v my-proxy.my-domain.com:9090
*   Trying 192.168.9.131:9090...
* connect to 192.168.9.131 port 9090 failed: No route to host
* Failed to connect to my-proxy.my-domain.com port 9090 after 18548 ms: Couldn't connect to server
* Closing connection 0
curl: (7) Failed to connect to my-proxy.my-domain.com port 9090 after 18548 ms: Couldn't connect to server
admin@ppdm:~>