Port attributes can only accept one port number, it can't accept port list.
Please see the following test case:
Set-Cookie2:Customer="dtftest";Discard; Secure; Domain="sun.com"; Max-Age="100";Version="1"; Path="/www"; Port="80,8080"
When parsing it, error will occur.

###@###.### 2005-07-05 09:28:09 GMT