Have an odd issue with using Zscaler App 188.8.131.52 DTLS 2.0 across a expensive Netgear Nighthawk R7000 DSL router. A client computer connected to this router via WIFI and wired Ethernet can’t access Internet via Zscaler Internet Access service. Zscaler App show connected, but it’s not working. Nothing is accessible besides the destinations that we bypass in Forwarding Profile.
We use Windows Filter Driver, without proxy settings, and with reduced MTU in forwarding profile so TCP MSS is reasonable safe. We have 20000+ computers that work normally…
As soon as replace the R7000 with another old router, then it works OK, and it’s also working OK when computer is connected via WIFI to mobile phone 4G Internet sharing.
Every time we put the R7000 back in line, then it fails. R7000 run latest firmware.
Do you have any ideas on what is could be causing this…?