Hi
I'm not sure which ISP/country you're from but the PVC settings may not match your ISP's which may stop you from connecting. It may be worth calling them and requesting the VPI and VCI settings for your connection. For instance, the UK uses 0/38, France uses 8/35, Singapore is 0/100.
If they say VPI/VCI is 0/100 for example, then try modifying the above config such that your pvc statement under the atm0 interface reads pvc0/100. Be sure to delete the existing pvc by using the no pvc3/100 statement in atm interface configuration mode.
Hope this helps