on error

docker/install.adoc

@@ -99,6 +99,16 @@ openssl s_client -showcerts -connect $registry_address:$registry_port < /dev/nul
 # bash ./set-ca.sh
 ```
 
+=== Error response from daemon
+
+```
+docker: Error response from daemon: Get https://registry.vlabs.uniwa.gr:5080/v2/: dial tcp: lookup registry.vlabs.uniwa.gr on [::1]:53: read udp [::1]:56425->[::1]:53: read: connection refused.
+```
+
+Try again!
+
+
+
 
 Happy coding :-)