Siblings fail to get some sites from parent.

[aj]

        I keep getting this error message on some sites only when using a
sibling cache.
        TCP_MISS:NO_DIRECT_FAIL in the sibling access.log.

        I see no entries in the parent logs.
        










 
          _   _                 _        _ 
  __ _   (_) | |__   __ _ _ __ | | _____| |
 / _` |  | | | '_ \ / _` | '_ \| |/ / _ \ |
| (_| |_ | |_| | | | (_| | | | |   <  __/ |
 \__,_(_)/ (_)_| |_|\__,_|_| |_|_|\_\___|_|
       |__/