diff --git a/tools/lib/filereader.py b/tools/lib/filereader.py
index e9b8b4b2ce..3bfdc75feb 100644
--- a/tools/lib/filereader.py
+++ b/tools/lib/filereader.py
@@ -10,10 +10,11 @@ DATA_ENDPOINT = os.getenv("DATA_ENDPOINT", "http://data-raw.comma.internal/")
 def internal_source_available():
   try:
     hostname = urlparse(DATA_ENDPOINT).hostname
-    if hostname:
-      socket.gethostbyname(hostname)
-      return True
-  except socket.gaierror:
+    port = urlparse(DATA_ENDPOINT).port or 80
+    with socket.socket(socket.AF_INET,socket.SOCK_STREAM) as s:
+      s.connect((hostname, port))
+    return True
+  except (socket.gaierror, ConnectionRefusedError):
     pass
   return False