Please check the connectivity between the proxy and and VM

The Backup is getting failed with below reason , please check the connectivity between the proxy and and VM

Failure Reason: Unable to open the disk(s) for virtual machine [SXXXXXXXXXXXX005].  

Please ensure the following:

1) the proxy is able to communicate with the ESX host and resolve the ESX host address  
2) the correct transport mode has been selected  
3) the disk types configured to the virtual machine are supported

Please help me how to troubleshoot this issue ?  

Provide a Step by Step process to understand it better..
ashokan jayaramanSenior SpecialistAsked:
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Which backup utility you are using to backup the VM machines?
ashokan jayaramanSenior SpecialistAuthor Commented:
@gaurav Singh : COMMVAULT
you need to check couple of things:

1. Check the permissions of the account on which backup services are running.
2. Give access to Proxy on storage.
ashokan jayaramanSenior SpecialistAuthor Commented:

1. Running on Admin Account
2. Giving proxy is not advisable in our environment

kindly help me in another way to overcome this
What type of SAN are you using? Also what version of Esxi and Commvault?

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