--- /usr/lib/python2.5/site-packages/trac/web/auth.py	2007-04-20 15:41:51.000000000 +0200
+++ /usr/lib/python2.5/site-packages/trac/web/auth.py	2007-11-25 15:09:57.000000000 +0100
@@ -142,6 +142,9 @@
 
         req.authname = remote_user
         req.outcookie['trac_auth'] = cookie
+        auth_domain = self.env.config.get('trac_auth', 'domain')
+        if len(auth_domain) > 0:
+                req.outcookie['trac_auth']['domain'] = auth_domain
         req.outcookie['trac_auth']['path'] = req.href()
 
     def _do_logout(self, req):