ORA-24247: network access denied by access control list (ACL)

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production 

When I run "select utl_http.request('http://www.tiger.com') from dual;"   I get the above error. 

I ran this query:

SELECT a.HOST

     , a.lower_port

     , a.upper_port

     , a.acl

     , principal

     , PRIVILEGE

     , is_grant

     , start_date

     , end_date

FROM   dba_network_acls a

     , dba_network_acl_privileges b

WHERE  a.acl = b.acl

The only null values are the ports and dates. 

host = *.xxx.com  (xxx is valid for our company)

acl =  /sys/acls/XXXDefault.xml

principal = valid schema

privilege = resolve/connect.

is_grant = true.

Thanks

Andy