Well - I tried that as well

************
location /SNX/ {
proxy_pass https://websocket;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $connection_upgrade;
proxy_set_header Connection "Upgrade";
proxy_set_header Host $host;
********************
And in nginx.conf file

http {
map $http_upgrade $connection_upgrade {
default upgrade;
'' close;
}


And still no luck - Here is what I see in access.log and it just stops there

182.48.206.98 - - [20/Sep/2021:07:59:32 +0530] "GET /Login/ComponentFrame?nPageMode=2&snxVersion=80,0,0064,18 HTTP/1.1" 200 1150 "https://vpn.xxxx.com/SNX/extender" "Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko"