diff --git a/HACKING.md b/HACKING.md
index f88579681..4ad6b9301 100644
--- a/HACKING.md
+++ b/HACKING.md
@@ -425,10 +425,10 @@ tests will create the required user using FreedomBox's first boot process.
 
 #### Running Functional Tests
 
-**When inside a container/VM you will need to target the guest**
-
+If you are testing a VM using NAT, and running the tests on the host,
+then you need to specify the URL and ports:
 ```bash
-guest$ export FREEDOMBOX_URL=https://localhost FREEDOMBOX_SSH_PORT=22 FREEDOMBOX_SAMBA_PORT=445
+host$ export FREEDOMBOX_URL=https://localhost:4430 FREEDOMBOX_SSH_PORT=2222 FREEDOMBOX_SAMBA_PORT=4450
 ```
 
 You will be running `py.test-3`.
diff --git a/plinth/tests/functional/config.ini b/plinth/tests/functional/config.ini
index 8f87c8ae3..f5916fe75 100644
--- a/plinth/tests/functional/config.ini
+++ b/plinth/tests/functional/config.ini
@@ -1,6 +1,6 @@
 [DEFAULT]
-url = https://localhost:4430
+url = https://localhost
 username = tester
 password = testingtesting
-ssh_port = 2222
-samba_port = 4450
+ssh_port = 22
+samba_port = 445