OS - All
Browser tested - mozilla

Build tested - b56 PIT build from the following location -
/net/dig-dug.east/bigtmp/deployment/1.6.0/pit/2005-10-04

Steps to reproduce -

1) Import the /net/sqe1/quality1/deployment1/deployment_mustang_int_ws/deployment/src/deployment/keystore_mozilla/lib/client.p12 into mozilla personal certificate store, the password is 1234

2)Import the /net/sqe1/quality1/deployment1/deployment_mustang_int_ws/deployment/src/deployment/keystore_mozilla/lib/ca.crt into mozilla authorities certificate store.

3) In Java Control Panel, Import /net/sqe1/quality1/deployment1/deployment_mustang_int_ws/deployment/src/deployment/keystore_mozilla/lib/dgu.p12 into client authentication store, this certificate has alias name "Dennis Gu" and password: dennisgu

4) Run the following applet -
https://eltanin.east.sun.com:4433/dennis/bug/test1.html

Click "OK" or "Run" for all the Security Warning windows.

5) The Host name Mismatch window does not come up before the applet loads.

Note - This problem is seen with PIT b56. On promoted b54, the host name mismatch window comes up as expected. This is a regression, and happens on all platforms.
Also, the host name mismatch window comes up for Jaws. Run the following application, and you should be able to see the window.
http://nicole1.sfbay.sun.com:8080/Mustang/https/https_hostnomatch.jnlp