diff --git a/main.py b/main.py
index 81786f4..36a52a5 100755
--- a/main.py
+++ b/main.py
@@ -184,7 +184,11 @@ class FrontRequestHandler(ProxyRequestHandler):
                               f'Proxy-agent: {self.version_string()}\r\n'
                               '\r\n').encode('ascii'))
             if self.host.count('.') >= 2:
-                commonname = '.' + self.host.partition('.')[-1]
+                isccSLD = len(self.host.split('.')[-2]) <= 3
+                if isccSLD:
+                    commonname = self.host
+                else:
+                    commonname = '.' + self.host.partition('.')[-1]
             else:
                 commonname = self.host
             dummycert = get_cert(commonname, config)