diff --git a/pyproject.toml b/pyproject.toml
index 992eae2c..1a329746 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,7 +31,7 @@ dependencies = [
   "py-machineid",
   "protobuf==6.31.1",
   "dijkstar==2.6.0",
-  "lattica==1.0.8",
+  "lattica==1.0.9",
 ]
 
 [project.scripts]
diff --git a/src/backend/server/scheduler_manage.py b/src/backend/server/scheduler_manage.py
index 53b342e9..b2fd52bc 100644
--- a/src/backend/server/scheduler_manage.py
+++ b/src/backend/server/scheduler_manage.py
@@ -167,6 +167,19 @@ def _start_lattica(self):
         self.lattica.build()
         logger.debug("Lattica node built")
 
+        if len(self.relay_servers) > 0:
+            try:
+                is_symmetric_nat = self.lattica.is_symmetric_nat()
+                if is_symmetric_nat is None:
+                    logger.warning("Failed to get is symmetric NAT, skip")
+                elif is_symmetric_nat:
+                    logger.error(
+                        "Your network NAT type is symmetric, relay does not work on this type of NAT, see https://en.wikipedia.org/wiki/Network_address_translation"
+                    )
+                    exit(1)
+            except Exception as e:
+                logger.exception(f"Error in is symmetric NAT: {e}")
+
         store_success = False
         for _ in range(10):
             try:
diff --git a/src/parallax/p2p/server.py b/src/parallax/p2p/server.py
index cea2c62a..78ad7976 100644
--- a/src/parallax/p2p/server.py
+++ b/src/parallax/p2p/server.py
@@ -270,6 +270,19 @@ def build_lattica(self):
 
         self.lattica.build()
 
+        if len(self.relay_servers) > 0:
+            try:
+                is_symmetric_nat = self.lattica.is_symmetric_nat()
+                if is_symmetric_nat is None:
+                    logger.warning("Failed to get is symmetric NAT, skip")
+                elif is_symmetric_nat:
+                    logger.error(
+                        "Your network NAT type is symmetric, relay does not work on this type of NAT, see https://en.wikipedia.org/wiki/Network_address_translation"
+                    )
+                    exit(1)
+            except Exception as e:
+                logger.exception(f"Error in is symmetric NAT: {e}")
+
         if self.scheduler_addr == "auto":
             self.scheduler_peer_id = None
             for _ in range(20):
diff --git a/src/parallax/server/node_chat_http_server.py b/src/parallax/server/node_chat_http_server.py
index d6abd345..f7c44a5d 100644
--- a/src/parallax/server/node_chat_http_server.py
+++ b/src/parallax/server/node_chat_http_server.py
@@ -117,6 +117,19 @@ def build_lattica(self):
 
         self.lattica.build()
 
+        if len(self.relay_servers) > 0:
+            try:
+                is_symmetric_nat = self.lattica.is_symmetric_nat()
+                if is_symmetric_nat is None:
+                    logger.warning("Failed to get is symmetric NAT, skip")
+                elif is_symmetric_nat:
+                    logger.error(
+                        "Your network NAT type is symmetric, relay does not work on this type of NAT, see https://en.wikipedia.org/wiki/Network_address_translation"
+                    )
+                    exit(1)
+            except Exception as e:
+                logger.exception(f"Error in is symmetric NAT: {e}, skip")
+
         if self.scheduler_addr == "auto":
             self.scheduler_peer_id = None
             for _ in range(20):