diff --git a/src/server/routes/cnf/[oneTimeLink].ts b/src/server/routes/cnf/[oneTimeLink].ts
index 3d048eb3..ec2dd5d0 100644
--- a/src/server/routes/cnf/[oneTimeLink].ts
+++ b/src/server/routes/cnf/[oneTimeLink].ts
@@ -27,10 +27,16 @@ export default defineEventHandler(async (event) => {
   });
   await Database.oneTimeLinks.erase(otl.id);
 
+  const configName = client.name
+    .replace(/[^a-zA-Z0-9_=+.-]/g, '-')
+    .replace(/(-{2,}|-$)/g, '-')
+    .replace(/-$/, '')
+    .substring(0, 32);
+
   setHeader(
     event,
     'Content-Disposition',
-    `attachment; filename="${client.name}.conf"`
+    `attachment; filename="${configName || client.id}.conf"`
   );
   setHeader(event, 'Content-Type', 'text/plain');
   return config;