diff --git a/logpolicy/logpolicy.go b/logpolicy/logpolicy.go
index 1419fff65..11c6bf14c 100644
--- a/logpolicy/logpolicy.go
+++ b/logpolicy/logpolicy.go
@@ -627,7 +627,7 @@ func (opts Options) New() *Policy {
 		conf.IncludeProcSequence = true
 	}
 
-	if envknob.NoLogsNoSupport() || testenv.InTest() {
+	if envknob.NoLogsNoSupport() || testenv.InTest() || runtime.GOOS == "plan9" {
 		opts.Logf("You have disabled logging. Tailscale will not be able to provide support.")
 		conf.HTTPC = &http.Client{Transport: noopPretendSuccessTransport{}}
 	} else {
diff --git a/net/dns/manager.go b/net/dns/manager.go
index 1e9eb7fe7..a569bb3a5 100644
--- a/net/dns/manager.go
+++ b/net/dns/manager.go
@@ -284,7 +284,7 @@ func (m *Manager) compileConfig(cfg Config) (rcfg resolver.Config, ocfg OSConfig
 
 	// Deal with trivial configs first.
 	switch {
-	case !cfg.needsOSResolver():
+	case !cfg.needsOSResolver() || runtime.GOOS == "plan9":
 		// Set search domains, but nothing else. This also covers the
 		// case where cfg is entirely zero, in which case these
 		// configs clear all Tailscale DNS settings.