Slow FortiClient VPN

[Zero]

Hello,

we are migrating from cisco AnyConnect VPN to FortiClient VPN. we are using FortiClient 7.2.5 and FortiGate 7.2.7 . we are seeing a significant difference in file transfer rate when the end user is trying to download a big file from a shared drive. I am pretty sure its not the internet circuit issue because I ran the test while I was working remotely. I have a 1Gb up/down and the download rate is similar to what our end-users are reporting. any help is greatly appreciated.

AnyConnectFortiClient

[homalgo1]

Try the other way around, actually - disable split DNS, and let your internal DNS server handle all DNS for the client. (This assumes the internal DNS is willing and capable of resolving any public DNS records)

[Zero]

its already setup to use our internal DNS. split DNS already disabled

[tpatel]

Hello, 

Make sure dtls is enable in ssl vpn setting on fortigate and also on forticlient. 

Please click on below link and reference document.

https://community.fortinet.com/t5/FortiGate/Technical-Tip-Using-DTLS-to-improve-SSL-VPN-performance/...