单选题Your company has a single Active Directory domain. The company network is protected by a firewall.Remote users connect to your network through a VPN server by using PPTP. When the users try to connect to the VPN server, they receive the following error message: °Error 721: The remote computer is not responding.You need to ensure that users can establish a VPN connection. What should you do？（）AOpen port 1423 on the firewall.BOpen port 1723 on the firewall.COpen port 3389 on the firewall.DOpen port 6000 on the firewall.
单选题
Your company has a single Active Directory domain. The company network is protected by a firewall.Remote users connect to your network through a VPN server by using PPTP. When the users try to connect to the VPN server, they receive the following error message: °Error 721: The remote computer is not responding.You need to ensure that users can establish a VPN connection. What should you do？（）
A
Open port 1423 on the firewall.
B
Open port 1723 on the firewall.
C
Open port 3389 on the firewall.
D
Open port 6000 on the firewall.
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