Originally posted by stecal
Maybe it's me, but your question is confusing. You get a different SID? Were you trying to connect to a different SID?
SID in Oracle terminology has many different meanings (as many other acronyms and terms in Oracle lingo do).

The original poster obviously refers to a SID as Session IDentifier as it is seen in V$SESSION, for example.

What you are refering to is probably SID as System IDentifier (aka identifier of an Oracle database instance) or Service IDentifier (aka any Oracle service).