test_ssl: test SHA256 using sha256.tbs-internet.com instead of sha2.hboeck.de

Lib/test/test_ssl.py

@@ -599,8 +599,8 @@ class NetworkedTests(unittest.TestCase):
         # SHA256 was added in OpenSSL 0.9.8
         if ssl.OPENSSL_VERSION_INFO < (0, 9, 8, 0, 15):
             self.skipTest("SHA256 not available on %r" % ssl.OPENSSL_VERSION)
-        # NOTE: https://sha256.tbs-internet.com is another possible test host
-        remote = ("sha2.hboeck.de", 443)
+        # https://sha2.hboeck.de/ was used until 2011-01-08 (no route to host)
+        remote = ("sha256.tbs-internet.com", 443)
         sha256_cert = os.path.join(os.path.dirname(__file__), "sha256.pem")
         with support.transient_internet("sha2.hboeck.de"):
             s = ssl.wrap_socket(socket.socket(socket.AF_INET),