Index: eventlet-0.29.1/eventlet/support/greendns.py
===================================================================
--- eventlet-0.29.1.orig/eventlet/support/greendns.py
+++ eventlet-0.29.1/eventlet/support/greendns.py
@@ -313,7 +313,7 @@ class ResolverProxy(object):
         self._cached_resolver = value
 
     def clear(self):
-        self._resolver = dns.resolver.Resolver(filename=self._filename)
+        self._resolver = dns.resolver.Resolver(filename=self._filename, configure=False)
         self._resolver.cache = dns.resolver.LRUCache()
 
     def query(self, qname, rdtype=dns.rdatatype.A, rdclass=dns.rdataclass.IN,
Index: eventlet-0.29.1/tests/greendns_test.py
===================================================================
--- eventlet-0.29.1.orig/tests/greendns_test.py
+++ eventlet-0.29.1/tests/greendns_test.py
@@ -885,7 +885,7 @@ class TinyDNSTests(tests.LimitedTestCase
         # https://github.com/eventlet/eventlet/issues/499
         # None means we don't want the server to find the IP
         with tests.dns_tcp_server(None) as dnsaddr:
-            resolver = Resolver()
+            resolver = Resolver(configure=False)
             resolver.nameservers = [dnsaddr[0]]
             resolver.nameserver_ports[dnsaddr[0]] = dnsaddr[1]
 
@@ -896,7 +896,7 @@ class TinyDNSTests(tests.LimitedTestCase
         # https://github.com/eventlet/eventlet/issues/499
         expected_ip = "192.168.1.1"
         with tests.dns_tcp_server(expected_ip) as dnsaddr:
-            resolver = Resolver()
+            resolver = Resolver(configure=False)
             resolver.nameservers = [dnsaddr[0]]
             resolver.nameserver_ports[dnsaddr[0]] = dnsaddr[1]
             response = resolver.query('host.example.com', 'a', tcp=True)