Multiple Oracle 9ias instances on single host

hi all
i tried installing more than 1 instances on a single host, under different oracle home......but i am facing certaing strange errors. Can anyone tell me what are the things that we have to specifically take care of while installing multiple instances on single host, i mean any port issues or anything else??
please help
thanks

hi all,
i have almost the same prolem here.
i have created two instances other then OC4J home. i have also deployed two different applications on the two different instances. but when i try to run the application it gives Page not found exception! for both the applications.
now when i stop one instance then the other instance runs properly and doesnt throw any error!
there is definately no problem with the ports as internally the ports allocated to both the applications are different!
if anybody has got any idea what might be the problem then it will be very helpful for me!
thanks in advance!!
Piyush

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