1 files changed, 15 insertions, 0 deletions
diff --git a/internal/config/validate.go b/internal/config/validate.go
index f73aabff..87f932c0 100644
--- a/internal/config/validate.go
+++ b/internal/config/validate.go
@@ -10,6 +10,10 @@ import (
 )
 
 func validateConfig(config *Config) error {
+	if err := validateListeners(config); err != nil {
+		return err
+	}
+
 	if err := validateAuthConfig(config); err != nil {
 		return err
 	}
@@ -21,6 +25,17 @@ func validateConfig(config *Config) error {
 	return tls.ValidateTLSVersions(*tlsMinVersion, *tlsMaxVersion)
 }
 
+func validateListeners(config *Config) error {
+	if config.ListenHTTPStrings.Len() == 0 &&
+		config.ListenHTTPSStrings.Len() == 0 &&
+		config.ListenHTTPSProxyv2Strings.Len() == 0 &&
+		config.ListenProxyStrings.Len() == 0 {
+		return errors.New("no listener defined, please specify at least one --listen-* flag")
+	}
+
+	return nil
+}
+
 func validateAuthConfig(config *Config) error {
 	if config.Authentication.Secret == "" && config.Authentication.ClientID == "" &&
 		config.Authentication.ClientSecret == "" && config.Authentication.RedirectURI == "" {