I got a code-signing certificate from Thawte. I imported it with private key into the keystore (jks type). Then I successfully signed my applet using this certificate. BUT when I show the page with my signed applet it still shows the UNKNOWN publisher! When I check the certificate from this dialog window then I see that it signed by Thawte. What is wrong? What I should check? Thanks...
After I added intermediate certificates into the pair then it started working. So this is solved.