Thank you for your valuable responses in adance....
Its showing SSL certificate invalid of a public website while accessing trough Teltonika RUT955 router..
I enabled webfilter "whitelist mode" and added the website name "ldpl-hys.spinergie.com" its is it should required ssl connection otherwise the client application do not conncet.
but while opning the webpage its showing ssl certificate invalid and http: webpage is opening. its working well when i am tested with mobile hotspot in the same PC.
how can we add entries in webfileter properly for https connections?