--- a/netwerk/test/unit/xpcshell.ini
+++ b/netwerk/test/unit/xpcshell.ini
@@ -331,17 +331,19 @@ skip-if = os == "android"
 skip-if = os != "win"
 [test_synthesized_response.js]
 [test_udp_multicast.js]
 [test_redirect_history.js]
 [test_reply_without_content_type.js]
 [test_websocket_offline.js]
 [test_tls_server.js]
 # The local cert service used by this test is not currently shipped on Android
-skip-if = os == "android"
+# Disabled on XP in bug 1190674 for intermittent failures
+skip-if = os == "android" || (os == "win" && (os_version == "5.1" || os_version == "5.2"))
+reason = bug 1190674
 firefox-appdir = browser
 [test_tls_server_multiple_clients.js]
 # The local cert service used by this test is not currently shipped on Android
 skip-if = os == "android"
 [test_1073747.js]
 [test_multipart_streamconv_application_package.js]
 [test_safeoutputstream_append.js]
 [test_packaged_app_service.js]