--- a/security/manager/ssl/tests/unit/xpcshell.ini
+++ b/security/manager/ssl/tests/unit/xpcshell.ini
@@ -149,16 +149,17 @@ requesttimeoutfactor = 2
 [test_sdr_preexisting.js]
 [test_sdr_preexisting_with_password.js]
 # Not relevant to Android. See the comment in the test.
 skip-if = toolkit == 'android'
 [test_session_resumption.js]
 run-sequentially = hardcoded ports
 [test_signed_apps.js]
 [test_ssl_status.js]
+run-sequentially = hardcoded ports
 [test_sss_enumerate.js]
 [test_sss_eviction.js]
 [test_sss_originAttributes.js]
 [test_sss_readstate.js]
 [test_sss_readstate_child.js]
 support-files = sss_readstate_child_worker.js
 # bug 1124289 - run_test_in_child violates the sandbox on android
 skip-if = toolkit == 'android'