diff --git a/conf/nginx/sni_forward.conf b/conf/nginx/sni_forward.conf
index 266863e50..a21786e79 100644
--- a/conf/nginx/sni_forward.conf
+++ b/conf/nginx/sni_forward.conf
@@ -3,7 +3,7 @@ stream {
 
     map $ssl_preread_server_name $name {
         {% for domain_ip in domain_ip_map %}
-        {{ domain_ip.split(":")[0] }} {{ domain_ip.split(":")[0].replace('.', '') }};
+        {{ domain_ip.split(":")[0] }} {{ domain_ip.split(":")[0].replace('.', '_') }};
         {% endfor %}
         default https_default_backend;
     }