With vMA 4.0, the ESX hosts were added to vMA 4.0. We are having scripts that uses VMWare perl APIs that connects to ESX hosts and gets required information. Everything was working fine. But, after the ESX hosts were re-built, we started seeing the following errors from VMWare API
Cannot complete login due to an incorrect user name or password

We removed the ESX hosts from the vMA and re-added them. But, the above error continues. passwords given are correct. Any ideas what could be the problem?