diff --git a/netbox/users/signals.py b/netbox/users/signals.py
index 652753b25..98036d5d1 100644
--- a/netbox/users/signals.py
+++ b/netbox/users/signals.py
@@ -8,4 +8,11 @@ from utilities.request import get_client_ip
 def log_user_login_failed(sender, credentials, request, **kwargs):
     logger = logging.getLogger('netbox.auth.login')
     username = credentials.get("username")
-    logger.info(f"Failed login attempt for username: {username} from {get_client_ip(request)}")
+    if client_ip := get_client_ip(request):
+        logger.info(f"Failed login attempt for username: {username} from {client_ip}")
+    else:
+        logger.warning(
+            "Client IP address could not be determined for validation. Check that the HTTP server is properly "
+            "configured to pass the required header(s)."
+        )
+        logger.info(f"Failed login attempt for username: {username}")