I am using SG230 all network traffic is normal but only have problem with zoom. I disabled all functions (qos, web filter, application control...) but no luck. Other video conference program is ok. Only Zoom has problem.
look in IPS / UDP flood - usually you will find lots of Zoom packets blocked there. UDP 3478, 3479, 8801 - 8810
Make exception for the ports.
I suggest you do not try to make exceptions for the 100 IP Ranges of zoom - because they use others that are not on the list. Just except the UDP Ports.
MS Teams is also using this port 3478-3481
There is in that case a lot of UDP flood related blocking in my case too. Especially related to packets returning. Just normal UDP port 443. Because that part in UTM is not statefull I disabled UDP Flood Protection at the moment till I got a better solution. (Yeah I know I could exclude maybe that port only but is there a difference? A possible attack will hit that exclusion too.)So just have a look into the log and you will be a step further to the solution.
And maybe tell us about your setup. Are you using proxy? Standard and/or transparent mode? And are you using the zoom Windows application?
no proxy. Standard mode. Yes, using zoom windows application
I checked firewall log, no IPS/UDP flood. Please tell me where can I find that log, thanks.
Hi, you won't find IPS logs in firewall.log - check here: