I am new here, so please bear with me if I don't do this right...

I have a 9iAS infrastructure on a HP unix box, with 3 mid-tiers for separate applications. On trying to install a fourth mid-tier I get as far as the installer needing to connect to OID whereupon an error pops up - "Unable to verify
connection to this OID instance. Please verify your Host Name, Port, Username and Password". Needless to say these are all correct and OID is up and running. I am following exactly the same documented procedure for the install as was used to create the third active mid-tier a couple of weeks ago. Oracle support seem baffled as am I. Anybody seen this error before and know what to do with it?

Thanks,

Martin Wilkinson.