VMware vCenter Plug-in for MD-Series Storage Arrays - Error

Hello Community,

I need your help by installing the vCenter Plug-In for MD3620i.

After installing it, I can't use the Plug-In, the error in the vSphere client:

The following error occured while downloading the script plugin from
vcenter-ip-address/.../configuration.xml:
The request failed because of a connection failure. (Unable to connect to the remote server)

What do you think could be reason of this error?

Thank you!