Forticlient VPN: A JavaScript Error Occurred in the Main Process

Hello CoolKiwiBloke,

Thank you for using the Community Forum.

I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible.

Regards,

Hello,

I found this post where a user has the same issue and found the solution:

https://www.reddit.com/r/fortinet/comments/lpr8ux/anyone_having_javascript_error_on_main_process/

Please, tell me if it helped you.

Regards,

Thanks for looking into it @Anthony_E I have indeed tried the suggestions on that link and a couple of others I found. But in the end the only solution was to roll back to an older version, 7.0.2.0090.

I have this same issue. It is not the issue that is fixed by installing Microsoft Visual C++ Redistributable (but I tried it anyway - no luck), the error messages are different. My error message matches this one exactly except for a few of the numbers which is probably caused by my using 7.0.6. 

I am in charge of our EMS and can roll back all the way to 7.0.1* which works but will not connect to our EMS because it won't support the certificate we have installed, so I am completely stuck with no answer here. 

So to summarize: This is a real issue. It's different than the one fixed with the MS C++ Redist. And in cases like mine it is a 100%, unresolved blocker.

*7.0.2 is not available for some reason in our EMS. It jumps straight from 7.0.1 to 7.0.3. Maybe it was pulled?

I have new information which might help. My boss noticed if you go into the Web portal and try to launch the client from there (https://0.0.0.0:4433/remote/login?lang=en) and select "Launch FortiClient" it Always fails with this same JavaScript error. This fails even for users who are not otherwise experiencing problems with the client. At the moment, none of our users can launch FortiClient this way. Any chance others in this thread can test this?

This should be fixed in 7.0.7. See release notes and details on bug ID 798055.

I faced the same issue. Took me 2 days to figure out what went wrong. After reading a lot of articles visual c++ was causing issue. So I installed 2015-2022 and now its working fine. Pasting the link to download visual c++ here. 

https://aka.ms/vs/17/release/vc_redist.x64.exe

The error returned as if it hasn't been gone. Unfortunately the same error.

One year later,
FortiClient VPN 7.2.1..
and I am still facing the same error !
I connected to the FortiGate WebVPN portal i.e.  https://vpn.acmecompany.xyz and clicked on "Launch FortiClient".
This starts the (already installed) FortiClient Executable on the PC with one argument:
(thanks to sysinternals for their process explorer ;)

"C:\Program Files\Fortinet\FortiClient\FortiClient.exe" "forticlient:///?hostname=vpn.acmecompany.xyz&"

Trying this on the cmd line in Windows,
I found that FortiClient.exe only starts up successfully if the command is executed in the directory "C:\Program Files\Fortinet\FortiClient".

If FortiClient exe is started from an other directory, the JS error above is displayed.

The argument where to connect to seems to be ignored in any case....

I can understand that the free FortiClient VPN is not TAC supported, so I cannot open an SR.
And I understand that FORTINET wants to sell their EMS and FC Licenses,
but I would appreciate a lot, if at least basic functionality
like launching the executable from a browser and initiating a connection to the hostname
would work with the free version... 

Try opening Configure Java window, check the advanced tab and enable latest TLS versions.