diff --git a/crates/lanparty-relay/src/server.rs b/crates/lanparty-relay/src/server.rs
index b798d28..d47f643 100644
--- a/crates/lanparty-relay/src/server.rs
+++ b/crates/lanparty-relay/src/server.rs
@@ -317,6 +317,7 @@ async fn accept_control_handshake(
                         accepted.peer.role() == Role::Client,
                     )
                     .await?;
+                    close_failed_accepted_handshake(connection);
 
                     return Err(error);
                 }
@@ -332,6 +333,7 @@ async fn accept_control_handshake(
                         accepted.peer.role() == Role::Client,
                     )
                     .await?;
+                    close_failed_accepted_handshake(connection);
 
                     return Err(error);
                 }
@@ -342,6 +344,10 @@ async fn accept_control_handshake(
     Ok(Some(accepted))
 }
 
+fn close_failed_accepted_handshake(connection: &quinn::Connection) {
+    connection.close(0_u32.into(), b"relay accepted handshake failed");
+}
+
 const fn accepted_handshake_steps(role: Role) -> &'static [AcceptedHandshakeStep] {
     match role {
         Role::Client => CLIENT_HANDSHAKE_STEPS,