Hello everybody!
I have read the whole thread, and searched accross Internet, but did not find solution for this problem:
The goal is to browse a https site without the notification which is about the untrusted site. Clients are Nokia Series 60 3rd devices. The original idea was that;
- obtain the rootca's certificate
- convert it from CER to DER file (reasons mentioned some replies above)
- make it downloadable to clients, and install it to certificates store on the devices
It seemed to work, but after a switchoff-switchon procedure it did not worked only for the first https visit. I mean, when a user switched off and switched on his/her device, and wanted to visit that https site, he/she got that annoying message about the untrusted site. But after closing browser, and revisiting that https site again, the message did not appear.
So, we went on, erased the certificate, and the above-mentioned CER file was transferred to the client device. And the solution perfectly worked after switch-off-on procedures also.
The conclusion is, that maybe the openssl misforms the DER (or PEM) file, which causes this behaviour. Or, the operating system treats differently the to different file format.
Any suggestions are welcome. Thanks.