Oh yes, definitely tested.  For you, I don't know if it's a matter of the instance name, white spaces, wrong port number, etc.  You've mentioned both "Management Studio' (sql2005), and...

I haven't converterd to sql2005 yet, so I'm definitely no wizard of it, however I did find the place to review and set the port and alias definitions.  Under Start>Programs>MS...

On the SQL2005 Server Registration Properties dialog, in the Server Name box, type the port number after server\instance names.  For example   "sql1\instance1,1234".  This is of course, if you know the port...

Regarding the temp table, you can test with a global temp table (create in another connection like query analyzer).  When I'm done with my testing, I change the global temp table...