I have Nethserver 7.6.1810 (final) running on a Dell Precision WorkStation T3500. It has two interfaces, one facing an internet router, the other providing connectivity for clients. Clients associate with an Access Point on the “inside” interface, and get DHCP configuration from NethServer. They then use Nethserver as their default gateway and access the Internet that way. It all seems to work fine. However, I have noticed that clients can download and read their email (outlook/O365) from an external server, when they try to use embedded links in the emails, the web pages they try to go to are corrupted/not downloaded/broken. This does not happen if I connect a client direct to the network on the Internet side of Nethserver.
I can see nothing suspicious in the logs, though that could be because I don’t know what I’m looking for.
Any suggestions would be great!