unble to connect on forticlient vpn 7.4 using ubuntu 24.04

I successfully installed forticlient from the official website.

but after installation i am getting status as connecting.

After that i checked in the "/var/log/forticlient/sslvpn.log" file and found below "certificate failed" error

root@ubuntu-client:/var/log/forticlient# tail -f sslvpn.log

Hostname: 114.143.xxx.xxx

Reason: X509 verify certificate failed

Certificate:
Subject name: /C=US/ST=California/L=Sunnyvale/O=Fortinet/OU=Certificate Authority/CN=support/emailAddress=support@fortinet.com
Fingerprint (SHA1): 16:B7:61:19:82:62:2C:B8:3C:14:D7:06:37:7A:15:0E:7D:55:3A:99
20250929 14:16:40.057 TZ=+0000 [sslvpn:DEBG] main:1707 543 bytes sent.
20250929 14:16:40.057 TZ=+0000 [sslvpn:DEBG] vpn_connection:664 http request error: 1

Just for testing i also installed forticlient vpn 7.4 on windows 11 system and it is working fine ( i am using both machine from my same network).

Please help me to resolve this issue.

Regards

Santosh kumar

+91-9041915296

santoshkumar2297@gmail.com