I keep hitting this error when setting up OBIA. I suppose it’s what it says on the tin, but Googling it didn’t match so I’m posting this so next time I hit it I remember 
Repository Error ([REP_51821] Failed to connect from Integration Service (pmserver) to repository Oracle_BI_DW_Base running in exclusive mode.)
The cause is the Repository Service having OperatingMode set to Exclusive. This is necessary for some of the setup operations like restoring the pre-built Repository, but if you forget to switch it back the Integration Service will suddenly stop working.
Thanks man…!
U did a great job by posting it in here. Or else i would hav re-formatted the system…which definitely sucks.
I HATE installing Informatica.
Priyank.
Comment by Priyank — February 15, 2010 @ 16:07
Thankyou so much for this..
I have been trying to figure out the problem since hours!
Divya
Comment by Divya — September 20, 2010 @ 11:32
Thanks
It really helped me!
Comment by Pashvina — October 14, 2010 @ 07:13