From 802d9b69ca8e6b145f7e09e06682d71a6ea15ebf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C4=99drzej=20Stuczy=C5=84ski?=
 <jedrzej.stuczynski@gmail.com>
Date: Thu, 17 Jul 2025 10:57:16 +0100
Subject: [PATCH] fix: don't allow mixnode running in exit mode (#5898)

* fix: don't allow mixnode running in exit mode

* fixed error message
---
 nym-node/src/config/mod.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/nym-node/src/config/mod.rs b/nym-node/src/config/mod.rs
index 80836b3834..257fc0f862 100644
--- a/nym-node/src/config/mod.rs
+++ b/nym-node/src/config/mod.rs
@@ -433,6 +433,14 @@ impl Config {
             ));
         }
 
+        // nor it's allowed to run mixnode mode alongside exit mode
+        // (use two separate checks for better error messages)
+        if self.modes.mixnode && self.modes.exit {
+            return Err(NymNodeError::config_validation_failure(
+                "illegal modes configuration - node cannot run as a mixnode and an exit gateway",
+            ));
+        }
+
         Ok(())
     }
 }