diff --git a/.travis.yml b/.travis.yml
index aebf55da1c..4c4c4de8c9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -157,7 +157,9 @@ jobs:
         file: build/package/*
         skip_cleanup: true
         api_key: "$GIT_RELEASES_API_KEY"
-    - script: 
+        on:
+          tags: true
+    - script:
       - bin/s3 sync s3://docker-images build/docker
       - docker load -i build/docker/myst_alpine.tgz
       - docker load -i build/docker/myst_ubuntu.tgz
diff --git a/nat/service_iptables.go b/nat/service_iptables.go
index 04fe1f81d8..c803e56db0 100644
--- a/nat/service_iptables.go
+++ b/nat/service_iptables.go
@@ -36,15 +36,11 @@ func (service *serviceIPTables) Add(rule RuleForwarding) {
 func (service *serviceIPTables) Start() error {
 	err := service.ipForward.Enable()
 	if err != nil {
-		return err
+		log.Warn(natLogPrefix, "Failed to enable IP forwarding: ", err)
 	}
 
 	service.clearStaleRules()
-	err = service.enableRules()
-	if err != nil {
-		return err
-	}
-	return nil
+	return service.enableRules()
 }
 
 func (service *serviceIPTables) Stop() {
diff --git a/nat/service_pfctl.go b/nat/service_pfctl.go
index 552705f34b..0aabe0775b 100644
--- a/nat/service_pfctl.go
+++ b/nat/service_pfctl.go
@@ -40,15 +40,11 @@ func (service *servicePFCtl) Add(rule RuleForwarding) {
 func (service *servicePFCtl) Start() error {
 	err := service.ipForward.Enable()
 	if err != nil {
-		return err
+		log.Warn(natLogPrefix, "Failed to enable IP forwarding: ", err)
 	}
 
 	service.clearStaleRules()
-	err = service.enableRules()
-	if err != nil {
-		return err
-	}
-	return nil
+	return service.enableRules()
 }
 
 func (service *servicePFCtl) Stop() {