I had this same issue. I resolved it by opening Java (Windows - Control Panel Java - Select Security Tab Select Manage Certificates. Select Certificate Type and choose Secure Site) on a known working ASDM installed computer.
Export the "Trusted Site" cert and import it on the computer with ASDM issue.
This resolved the issue for me. I exported the self-signed certificates from each of my ASAs and then imported them into the "secure site" section in Java console (the "trusted certificates" section did not work). I have seen this previously for another java application as well. This was with ASDM 7.1(5)100 and Java version 7 update 51.
thanks mate!! you people saved my day.. its working fine for me..
Added username and password and changed the security level to medium in java control panel in windows 7.
Now need to explore ASDM.. :-)
would you please explain to me how to export the self signed ssl certificate from the ASA (CLI) in order to import it in Java secure web site?
Many thnaks in advance
I ran into a VERY similar problem and was loading all the certificates into Java with no luck. For those of you like me, please be aware that if you're using AES-256 encryption ASDM will not work unless you have JCE version of Java installed. After installing it came right up!
I have been going through this with every Java update for the last few years. I set the security for the site to trusted, security to high (lowest it will go).
Problem is, every version defaulted to the non-export-grade encryption. You want to use "unlimited" grade (search for it). Oracle says that starting with 8_162 they now default to unlimited.
Note that the actual files you need to replace have not changed since 2013 or 2014.
I am on .151, and can tell you I had to do it manually again. Once files moved, closed and reopened application and it worked fine.
So, Java settings that work for me are high, added IP to trusted (it was a local), and made sure I had the unlimited files in the security directory.
Hope this helps someone...