Reorganize Objects in OEM - Host Credentials do not have enough privileges When I try to re-organize objects from OEM (11g) and enter my host credentials (not "oracle"), I get the message:


  "An error occurred verifying the host credentials. Make sure the
  credentials are valid and that they specify an account with enough
  privileges to write to the directory where the reorganization script
  will be created. Credential verification error: ERROR: Invalid
  username and/or password"


My host username is a member of the oinstall and dba groups.  I guess my first question is what directory is it that I need write access to?  My second question is what privileges do I need in order to run a reorg (not as the "oracle" user)?

I should say that this is a linux Oracle server.
You have different types of credentials in OEM !
First you need to create those credentials and test them. 
See here an article that walks you throw how to create and test your named credentials