VPN, DNS and NTP Server Policies

Please read the Frontier Acceptable Use Policy (AUP). All Frontier customers must follow these rules.

Here are Frontier's VPN, DNS and NTP Server policies:

  • Virtual Private Network (VPN): Frontier cannot support your company's VPN because we support connectivity of High-Speed Internet connection to one PC only. For VPN help, contact your company or the manufacturer of your VPN software.
  • Reverse DNS Record: Frontier will not allow a customer to receive email from an IP address without a reverse DNS record. Frontier may block or rate-limit mail from email sources that do not have matching forward and reverse DNS records. This lets us filter out spam, but sometimes it blocks valid email. If someone is having trouble sending you email, and is getting this error:
    553 sorry, your mail server (XXX.XXX.XXX.XXX) is rejected. Reverse DNS queries for your mail server IP fail.
    …they need to contact their Internet Service Provider for support.
  • Network Time Protocol (NTP) Server Addresses: Frontier customers may use the following NTP server addresses:

To learn about the DNS and domain services that Frontier offers, go to

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