We need to access a share that sits on a 2003 server housed at a datacentre. Without going down the VPN route I configured the Windows firewall to allow file sharing, created a share and gave certain users access to it. I can now map this share remotely (\\external ip of server\sharename) and can gain access to it after entering the correct username and password. My question is: How secure a method of accessing the server is this? Am I opening up a whole host of security problems?