APEX Migration to Weblogic now throws certificate error
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Ever since moving an internal apex website from the embedded PL/SQL gateway to a weblogic server browsers throw certificate errors. 

How can i get rid of these errors/fix the certificates?

Internet Explorer:

    The security certificate presented by this website was not issued by 
    a trusted certificate authority. Security certificate problems may 
    indicate an attempt to fool you or intercept any data you send to the server

Chrome:

    You attempted to reach sy02131.adt.com, but the server presented a 
    certificate issued by an entity that is not trusted by your computer's
    operating system. This may mean that the server has generated its own 
    security credentials, which Google Chrome cannot rely on for identity 
    information, or an attacker may be trying to intercept your communications.