--- a/testing/mozharness/mozharness/mozilla/proxxy.py
+++ b/testing/mozharness/mozharness/mozilla/proxxy.py
@@ -32,19 +32,18 @@ class Proxxy(ScriptMixin, LogMixin):
             ('https://ftp-ssl.mozilla.org', 'ftp.mozilla.org'),
             # pypi
             ('http://pypi.pvt.build.mozilla.org', 'pypi.pvt.build.mozilla.org'),
             ('http://pypi.pub.build.mozilla.org', 'pypi.pub.build.mozilla.org'),
         ],
         "instances": [
             'proxxy1.srv.releng.use1.mozilla.com',
             'proxxy1.srv.releng.usw2.mozilla.com',
-            'proxxy1.srv.releng.scl3.mozilla.com',
         ],
-        "regions": [".use1.", ".usw2.", ".scl3"],
+        "regions": [".use1.", ".usw2."],
     }
 
     def __init__(self, config, log_obj):
         # proxxy does not need the need the full configuration,
         # just the 'proxxy' element
         # if configuration has no 'proxxy' section use the default
         # configuration instead
         default_config = {} if self.is_taskcluster() else self.PROXXY_CONFIG