Connect a server to another through VPN

I need to access a LDAP directory from server A. However the directory is hosted on server B, which I can only access from server A using a VPN connection.

My question is: how stable and secured would it be to permanently connect server 开发者_如何学GoA to server B? Would there be a risk that the password of my VPN account could be compromised? is that a common way to access resources protected in such a way?

Which kind of VPN do you use? If you use something with certificates your own VPN account password is not in case. Everything else depends on how secure you thing your VPN is.