diff --git a/backend/app.py b/backend/app.py
index dc535d0..368c529 100644
--- a/backend/app.py
+++ b/backend/app.py
@@ -224,7 +224,8 @@ if __name__ == '__main__':
     os.chdir(os.path.dirname(os.path.realpath(__file__)))
     uvicorn.run(
         "app:app",
-        host=FIREGEX_HOST,
+        # None allows to bind also on ipv6, and is selected if FIREGEX_HOST is any
+        host=None if FIREGEX_HOST == "any" else FIREGEX_HOST,
         port=FIREGEX_PORT,
         reload=DEBUG and not NORELOAD,
         access_log=True,
diff --git a/run.py b/run.py
index c62ed87..d0f3c1e 100755
--- a/run.py
+++ b/run.py
@@ -95,7 +95,8 @@ def load_config():
     import json
     default_config = {
         "port": 4444,
-        "host": "0.0.0.0"
+        # any allow to bind service also on ipv6 (see the main of backend to understand why)
+        "host": "any"
     }
     
     if os.path.isfile(g.configfile):