Cloud Builder in VCF 4.2 has enhanced password requirements.
Thus if you deploy the appliance with a password which doesn’t match those requirements it’s going to be deployed with an error, making it unusable.
While trying to access the GUI you will get “502 Bad Gateway” which is not so meaningful.
Trying to access SSH will fail as well. However, accessing the direct console gives a clear information about the problem.
Based on that there is nothing left than redeploying the appliance.