diff --git a/FAQ.md b/FAQ.md
index 1742ef8..8eda252 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -1020,6 +1020,10 @@ Case 2:
 >
 > > Yup! It's weird. I even confirmed the keys were the correct on all machines in the network settings. But as soon as I shut down the local server running on my network, the devices in my digital ocean server populated with the clients I installed and I was able to connect to the device that was giving the key error. Not sure if it's a big you need to investigate?
 
+Case 3:
+
+> As you correctly pointed out, the problem was caused by two hbbs processes running simultaneously – one via Docker and one started manually via systemd. This led to a port conflict and ultimately resulted in the clients receiving the “keys do not match” error.
+
 
 # RustDesk Service service terminated unexpectedly