try this

diff --git a/modules/dacs/files/common/acl-private.0 b/modules/dacs/files/common/acl-private.0
index 9c60c60..9124857 100644 (file)
--- a/modules/dacs/files/common/acl-private.0
+++ b/modules/dacs/files/common/acl-private.0
@@ -1,6 +1,6 @@
 <acl_rule status="enabled">
   <services>
-      <service url_expr="https://munin.debian.org"/>
+      <service url_expr='https://munin.debian.org'/>
       <service url_pattern="/nagios3/*"/>
   </services>
   <rule order="allow,deny" pass_http_cookie="yes">