Applet work with JRE 7_51 but NOT with JRE 7_45

Hello,
My major problem is, that my Applet signed with COMODO certificate DOES NOT WORK with JRE 7_45.
The SAME applet works fine with JRE 7_45, if I sign this applet WITH A SELFMADE UNTRUSTED certificate.
WHY the comodo signed applet doesn't run in JRE 7_45 ???
If i launch the comodo signed applet with JRE 7_51 it works perfect !!!
But in our company we got JRE 7_45 and I have to deal with JRE 7_45. That’s my problem.
Could you please tell me a solution what I have to do that the comodo signed applet works also in JRE 7_45.
Thank you!
Philipp

Thanks gimbal2.
I agree the problem may be in the proxy or in the firewall but I don' to know how to prove it as if i call the servlet url from browser I dont have problems .
The version im using is 6.45 but im sure the same problem occurs also with other versions of JRE6 .
... and the problem disappear with JRE7 ...
trouble is my company want people to use JRE6
any idea ?
Gio

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