Hello Kishan,
If you are seeing PIX error code '305006' , it relates to the following :
Log Message %PIX-7-305006: type translation creation failed for protocol
Explanation A protocol (UDP, TCP, or ICMP) failed to create a translation through the PIX Firewall. The type can be static, portmapped (PAT), or regular.
Recommended Action This message can be either an internal error or an error in the configuration.
So, in saying this can you pls. post your PIX config (pls. exclude all internal IP's and passwords), so that we can help you out further.
Thanks --