which port must be opened to correct this specific problem?

After successfully adding a new ESXi 6.x host to vCenter Server, an administrator sees it as Not Responding in the vSphere Web Client interface a few minutes
later.
If the issue is caused by a network firewall blocking traffic, which port must be opened to correct this specific problem?

After successfully adding a new ESXi 6.x host to vCenter Server, an administrator sees it as Not Responding in the vSphere Web Client interface a few minutes
later.
If the issue is caused by a network firewall blocking traffic, which port must be opened to correct this specific problem?

A.
443 (TCP)

B.
443 (UDP)

C.
902 (TCP)

D.
902 (UDP)

Explanation:
Explanation/Reference:

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Lebeg

Lebeg

https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1029919

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andy75

andy75

Interestingly, the referenced article says:

Ensure that these ports are open in the firewall between vCenter Server and the ESXi/ESX hosts: 902 – UDP & TCP; 443 – TCP

which makes A, C, and D correct ! Thanks VMware Edu – you folks rock !… 🙁

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Emanuel Jojo

Emanuel Jojo

I would say 902 UDP (D) as an obvious answer as the question states “After successfully adding a new ESXi 6.x host to vCenter Server” meaning the connection works on on 443 TCP and 902 TCP – Client connections while 902 UDP is used for vCenter Server agent (source: https://docs.vmware.com/en/VMware-vSphere/6.0/com.vmware.vsphere.install.doc/GUID-171B99EA-15B3-4CC5-8B9A-577D8336FAA0.html) and this is where the questions states it is failing “Not Responding in the vSphere Web Client interface”

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alex

alex

D
https://pubs.vmware.com/vsphere-60/index.jsp#com.vmware.vsphere.install.doc/GUID-925370DD-E3D1-455B-81C7-CB28AAF20617.html

Managed hosts also send a regular heartbeat over UDP port 902 to the vCenter Server system. This port must not be blocked by firewalls between the server and the hosts or between hosts.

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andy75

andy75

Both TCP/UDP 902 are listed there, but apparently the key word there is “heartbeat” which does not require a stateful protocol like TCP. THat being the case, UDP 902 is the answer indeed.

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