Why does the ConneXium Network Manager say that my IP address has an invalid gateway?

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Issue:
ConneXium Network Manager reporting IP address has an invalid gateway

Product Line:
ConneXium Network Manager

Resolution:
Possible cause are:
When you enter a gateway address, ConneXium Network Manager does 2 things:

1. Validates that the gateway address is in the same subnet as the IP address
2. Contacts the gateway address

If a response is received from the gateway address, ConneXium Network Manager discovers if the address is actually a gateway/router address.
If the address is not an actual gateway/router address, ConneXium Network Manager displays a detected error message.
If no response is received from the gateway address, ConneXium Network Manager takes no action.

Possible solution:

Enter a valid gateway address or enter a gateway address that is in the same subnet as the IP address.
Note: Check that the gateway address is not assigned to any other device on the subnet