At the university I used to work out, the swapped out the Cisco firewalls for Junipers. One of my applications immediately started having random errors. A wee

At the university I used to work out, the swapped out the Cisco firewalls for Junipers. One of my applications immediately started having random errors. A week of troubleshooting with the network team, and Juniper support, concluded that the routers were silently dropping some UDP packets. No logs for it, and no rules to explain it, and no pattern to it either. It took days to just convince the network guys that it really might be the firewall, since it wasn't reporting any issues or any reason for the packet loss. Also no fix for it. We had to switch the application to TCP in order to work around the problem.