diff --git a/src/bin/file_server.rs b/src/bin/ptth_file_server.rs
similarity index 100%
rename from src/bin/file_server.rs
rename to src/bin/ptth_file_server.rs
diff --git a/src/bin/relay.rs b/src/bin/ptth_relay.rs
similarity index 100%
rename from src/bin/relay.rs
rename to src/bin/ptth_relay.rs
diff --git a/src/bin/server.rs b/src/bin/ptth_server.rs
similarity index 100%
rename from src/bin/server.rs
rename to src/bin/ptth_server.rs
diff --git a/src/relay/mod.rs b/src/relay/mod.rs
index 654aa66..fd5bebf 100644
--- a/src/relay/mod.rs
+++ b/src/relay/mod.rs
@@ -397,6 +397,16 @@ pub async fn run_relay (
 		4000,
 	));
 	
+	{
+		let mut tripcode_set = HashSet::new ();
+		
+		for (_, v) in state.config.server_tripcodes.iter () {
+			if ! tripcode_set.insert (v) {
+				panic! ("Two servers have the same tripcode. That is not allowed.");
+			}
+		}
+	}
+	
 	eprintln! ("Loaded {} server tripcodes", state.config.server_tripcodes.len ());
 	
 	let make_svc = make_service_fn (|_conn| {
diff --git a/todo.md b/todo.md
index 9987cc8..96ba1b8 100644
--- a/todo.md
+++ b/todo.md
@@ -1,3 +1,5 @@
+- Error out if 2 servers have the same tripcode
+- Error out if a server has a weak password
 - ETag cache
 - Server-side hash?
 - Log / audit log?