fortigate 100E sd-wan problem

[ialhusari93]

Dears ,

we have two ISP connections wan1 and wan2 which are configured to use SD-WAN on fortigate 100E , we have noticed that there is internet issues over some applications like anydesk connection timeout and slowness once the SD-WAN is on , how can we troubleshoot this further? everything becomes normal again once we turn off the SD-WAN .

Regards ,

[sjoshi · Accepted solution]

Hi ialhusari93,

Thank you for posting to the Fortinet Community Forum.

As per your description when you are using SDWAN you are facing issue while using some application and they are getting timeout.

Please let me know the SDWAN rule you are using.
When you are disabling the SDWAN then did you check by sending the traffic from both the interface and it was working good from both the interface or single interface.

Try enabling the sdwan and create a new rule and use manual method and sent the traffic via one ISP and check if the issue remains same.

Also do the following changes:-

config system interface
edit <wan1>
set preserve-session-route en
end

config system interface
edit <wan2>
set preserve-session-route en
end

Let us know if this helps.

Thanks

[sw2090]

you could look at your session table. Probably you run into similar issues I ran into. I had some sites that use encrypted session cookies which kept throwing ppl out again and again because the sd-wan kept changing the wan interface even though the session still existed and broke the encryption with that. 

I finally had to except those with some sd-wan rule that forces them to use a speific interface only.