diff --git a/Cargo.lock b/Cargo.lock
index 56dffd0..b8f553d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -141,7 +141,7 @@ dependencies = [
 [[package]]
 name = "confy"
 version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
+source = "git+https://github.com/open-trade/confy#a95119c82d1e4e3f1d4b46bd668990eff5dce2c8"
 dependencies = [
  "directories 2.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.115 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -465,7 +465,7 @@ version = "0.1.0"
 dependencies = [
  "anyhow 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytes 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "confy 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "confy 0.4.0 (git+https://github.com/open-trade/confy)",
  "copypasta 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "directories-next 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "dirs-next 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1722,7 +1722,7 @@ dependencies = [
 "checksum cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 "checksum clipboard-win 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e3a093d6fed558e5fe24c3dfc85a68bb68f1c824f440d3ba5aca189e2998786b"
 "checksum cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ddfc5b9aa5d4507acaf872de71051dfd0e309860e88966e1051e462a077aac4f"
-"checksum confy 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2913470204e9e8498a0f31f17f90a0de801ae92c8c5ac18c49af4819e6786697"
+"checksum confy 0.4.0 (git+https://github.com/open-trade/confy)" = "<none>"
 "checksum constant_time_eq 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "245097e9a4535ee1e3e3931fcfcd55a796a44c643e8596ff6566d68f09b87bbc"
 "checksum copypasta 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "865e9675691e2a7dfc806b16ef2dd5dd536e26ea9b8046519767d79be03aeb6a"
 "checksum core-foundation 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "57d24c7a13c43e870e37c1556b74555437870a04514f7685f5b354e090567171"
diff --git a/libs/hbb_common b/libs/hbb_common
index 3ac8321..dc39de2 160000
--- a/libs/hbb_common
+++ b/libs/hbb_common
@@ -1 +1 @@
-Subproject commit 3ac832109bb75284a1d195a47300498e3bddc277
+Subproject commit dc39de26981c2916c053762eef6961f6b659fb0c
diff --git a/src/rendezvous_server.rs b/src/rendezvous_server.rs
index b26ccf6..231894a 100644
--- a/src/rendezvous_server.rs
+++ b/src/rendezvous_server.rs
@@ -27,6 +27,7 @@ use std::{
 struct Peer {
     socket_addr: SocketAddr,
     last_reg_time: Instant,
+    uuid: Vec<u8>,
     pk: Vec<u8>,
 }
 
@@ -37,6 +38,7 @@ impl Default for Peer {
             last_reg_time: Instant::now()
                 .checked_sub(std::time::Duration::from_secs(3600))
                 .unwrap(),
+            uuid: Vec::new(),
             pk: Vec::new(),
         }
     }
@@ -47,6 +49,8 @@ struct PeerSerde {
     #[serde(default)]
     ip: String,
     #[serde(default)]
+    uuid: Vec<u8>,
+    #[serde(default)]
     pk: Vec<u8>,
 }
 
@@ -65,18 +69,19 @@ impl PeerMap {
     }
 
     #[inline]
-    fn update_pk(&mut self, id: String, socket_addr: SocketAddr, pk: Vec<u8>) {
+    fn update_pk(&mut self, id: String, socket_addr: SocketAddr, uuid: Vec<u8>, pk: Vec<u8>) {
         let mut lock = self.map.write().unwrap();
         lock.insert(
             id.clone(),
             Peer {
                 socket_addr,
                 last_reg_time: Instant::now(),
+                uuid: uuid.clone(),
                 pk: pk.clone(),
             },
         );
         let ip = socket_addr.ip().to_string();
-        self.db.insert(id, PeerSerde { ip, pk });
+        self.db.insert(id, PeerSerde { ip, uuid, pk });
     }
 
     #[inline]
@@ -91,6 +96,7 @@ impl PeerMap {
                 self.map.write().unwrap().insert(
                     id,
                     Peer {
+                        uuid: v.uuid,
                         pk: v.pk,
                         ..Default::default()
                     },
@@ -189,16 +195,14 @@ impl RendezvousServer {
                     let id = rk.id;
                     let mut res = register_pk_response::Result::OK;
                     if let Some(peer) = self.pm.get(&id).await {
-                        if peer.pk.is_empty() {
-                            self.pm.update_pk(id, addr, rk.pk);
-                        } else {
-                            if peer.pk != rk.pk {
-                                log::warn!("Peer {} pk mismatch: {:?} vs {:?}", id, rk.pk, peer.pk);
-                                res = register_pk_response::Result::PK_MISMATCH;
-                            }
+                        if peer.uuid != rk.uuid {
+                            log::warn!("Peer {} pk mismatch: {:?} vs {:?}", id, rk.uuid, peer.uuid);
+                            res = register_pk_response::Result::UUID_MISMATCH;
+                        } else if peer.pk != rk.pk {
+                            self.pm.update_pk(id, addr, rk.uuid, rk.pk);
                         }
                     } else {
-                        self.pm.update_pk(id, addr, rk.pk);
+                        self.pm.update_pk(id, addr, rk.uuid, rk.pk);
                     }
                     let mut msg_out = RendezvousMessage::new();
                     msg_out.set_register_pk_response(RegisterPkResponse {
@@ -260,11 +264,11 @@ impl RendezvousServer {
             let tx = self.tx.clone();
             tokio::spawn(async move {
                 let v = pm.db.get(id.clone()).await;
-                let pk = {
+                let (uuid, pk) = {
                     if let Some(v) = super::SledAsync::deserialize::<PeerSerde>(&v) {
-                        v.pk
+                        (v.uuid, v.pk)
                     } else {
-                        Vec::new()
+                        (Vec::new(), Vec::new())
                     }
                 };
                 let mut msg_out = RendezvousMessage::new();
@@ -278,6 +282,7 @@ impl RendezvousServer {
                     Peer {
                         socket_addr,
                         last_reg_time,
+                        uuid,
                         pk,
                     },
                 );