I am trying to use mpich2 and cannot get it to work! does anyone know what this means? op_read error on left context: Error = -1 unable to read the challenge string, Error = -1 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/mpich-discuss/attachments/20120131/cc9c49fe/attachment.htm>