Imac - Time Capsule - Slingbox Set Up ?

I have spent a few hours now trying to set up my Slingbox so hopefully I can watch some TV when I am back at work.

I have got CAT CDMA working fine on my computer (Imac) I have set it up to share the internet connection with my Time Capsule and can connect to this no problems. However I am trying to set up the Slingbox and it does not get a network connection with the Time Capsule when the Cat is running. Also when I do get a connection it is very short lived.

I have been reading up on the internet and tried lots of different settings but to no avail.

Hopefully someone can help with this?

Thanks