diff --git a/src/pytest_flask/fixtures.py b/src/pytest_flask/fixtures.py
index 1fcb097..54e6487 100644
--- a/src/pytest_flask/fixtures.py
+++ b/src/pytest_flask/fixtures.py
@@ -77,7 +77,7 @@ def test_server_is_up_and_running(live_server):
     host = cast(str, pytestconfig.getvalue("live_server_host"))
 
     # Explicitly set application ``SERVER_NAME`` for test suite
-    original_server_name = app.config["SERVER_NAME"] or "localhost.localdomain"
+    original_server_name = app.config["SERVER_NAME"] or host
     final_server_name = _rewrite_server_name(original_server_name, str(port))
     app.config["SERVER_NAME"] = final_server_name
 
diff --git a/tests/test_live_server.py b/tests/test_live_server.py
index 3cedd0b..95a01af 100755
--- a/tests/test_live_server.py
+++ b/tests/test_live_server.py
@@ -1,4 +1,5 @@
 import os
+from urllib.request import urlopen
 
 import pytest
 from flask import url_for
@@ -24,15 +25,18 @@ def test_server_listening(self, client, live_server):
     def test_url_for(self, live_server):
         assert (
             url_for("ping", _external=True)
-            == "http://localhost.localdomain:%s/ping" % live_server.port
+            == "http://localhost:%s/ping" % live_server.port
         )
 
     def test_set_application_server_name(self, live_server):
         assert (
-            live_server.app.config["SERVER_NAME"]
-            == "localhost.localdomain:%d" % live_server.port
+            live_server.app.config["SERVER_NAME"] == "localhost:%d" % live_server.port
         )
 
+    def test_live_server_url_is_reachable(self, live_server):
+        with urlopen(live_server.url("/ping")) as response:
+            assert response.status == 200
+
     def test_rewrite_application_server_name(self, appdir):
         appdir.create_test_module("""
             import pytest