I have a free account, so no support.
I am using DynamicDNS and it works fine with your service, but I noticed that ns3.zoneedit.com has "old" information.
The TTL is 5 mins, and its been weeks since my last IP change, it is fine with all of your other NS servers, just not ns3
This as you can imagine causes all sorts of grief
[root@stageutil03 s]# dig +short @ns3.zoneedit.com vpn.drcs.ca
24.76.176.107
[root@stageutil03 s]# dig +short @ns4.zoneedit.com vpn.drcs.ca
50.71.6.197
50.71.6.197 is the correct address as it is in the GUI
I am using DynamicDNS and it works fine with your service, but I noticed that ns3.zoneedit.com has "old" information.
The TTL is 5 mins, and its been weeks since my last IP change, it is fine with all of your other NS servers, just not ns3
This as you can imagine causes all sorts of grief

[root@stageutil03 s]# dig +short @ns3.zoneedit.com vpn.drcs.ca
24.76.176.107
[root@stageutil03 s]# dig +short @ns4.zoneedit.com vpn.drcs.ca
50.71.6.197
50.71.6.197 is the correct address as it is in the GUI