Hello,
I trying to setup my UTM for days now. It is my first Sophos UTM but i had many other over the past years (IPCop, Smoothwall, Endian, pfSense, Untangle...) but i never had such trouble getting it to work.
I setup everything the same way i did on other UTM solutions, all the settings are correct and other UTMs are working with these settings except Sophos.
My setup looks like this:
Interface: WAN
IPv4 Address: 192.168.1.250
Netmask: 255.255.255.0
GW IP: 192.168.1.100 (Router)
Interface: LAN
IPv4 Address: 192.168.0.250
Netmask: 255.255.255.0
DHCP Range from 30-70
On Global DNS Tab i set Internal Networks allowed, On DNS Forwarder i set the Google DNS Servers. I created a Firewall Rule from Internal to ANY.
I use the UTM Internal IP as DNS (192.168.0.250) for Clients, if i change the DNS Server to Google or ISP (on a Client machine, i get internet access (sometimes...).
After a fresh install the internet connection will work for some time, but after another restart or so it suddenly stops. I can't ping to any hostname out there such as google.com. I can pint the Router and other local devices, even from an internal Machine.
I created backups, did several factory resets and even reinstalled the UTM from an .iso. Nothing worked i can't get it online. I guess it has something to do with DNS but i can't find the error.
On Untangle i can set the DNS Servers during WAN creating, here i can only define the Gateway but i assume that the DNS Forwarder Tab is for this, right ?
So in short:
-Router connects to internet
- Sophos UTM connects to Router via Static WAN set to Router IP as Default GW.
-Global DNS set for Internal Networks
-DNS Forwarders are Google or the ISP (doesn't matter) Use ISP DNS unchecked (don't show up anyway).
-Can't ping oder resolve any DNS from within WebAdmin Interface Tools to Internet Server
-Using Google DNS Server on Clients and Internet will work.
-Will not work on clients with UTM Internal IP as DNS
-Factory reset don't help
-Resore fom backup don't help
-Reinstall UTM OS don't work
-Works some time after fresh install ?!?
-Other UTMs i still have still work flawlessly with the same settings and connected Hardware.
I struggle with this since 4 days, i just can't get it to work properly. I think it has something to do with DNS but i cant really find anything specific. Read all the threads here and elsewhere on the internet related to Sophos UTM and DNS but nothing worked.
Any suggestions ? which DNS setting have i missed ? i basically just want that the WAN interface uses the ISPs or Google's DNS Server for resolution, should be a simple thing as it was on other UTMs like Untangle etc.
-Alex
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