I use utorrent and set tcp and udp correctly and download and upload ok. Problem is ,when download is finished and stopped utorrent sends an event stopped message to tracker to update my ratio. Since using comodo i see lots of icmp blocked in logs, saying error code 3 port unreachable.and ratio has stopped updating. So i have allowed icmp ,and maybe coincidence but now ratio is updating. Could icmp be needed to send ratio message to tracker and if so is it safe to allow icmp in a rule to allow all. If not safe ,how to create a rule for utorrent.