1 files changed, 4 insertions, 1 deletions
diff --git a/caddy.go b/caddy.go
index 3d8a6139b..7e07a5dc3 100644
--- a/caddy.go
+++ b/caddy.go
@@ -777,7 +777,10 @@ func IsInternal(addr string) bool {
 
 	host, _, err := net.SplitHostPort(addr)
 	if err != nil {
-		host = addr // happens if the addr is just a hostname
+		host = addr // happens if the addr is just a hostname, missing port
+		// if we encounter an error, the brackets need to be stripped
+		// because SplitHostPort didn't do it for us
+		host = strings.Trim(host, "[]")
 	}
 	ip := net.ParseIP(host)
 	if ip == nil {