HTTP Status 404 - /framework/html/blank.html ON NEW REQUETS

When I start to create a Service request appears the following error on Service request body:
�HTTP Status 404 - /framework/html/blank.html

type Status report

message /framework/html/blank.html

description The requested resource (/framework/html/blank.html) is not available.
Apache Tomcat/5.0.28�

On IE after 2 seconds the error disappears and I�m able to write in this section and open the Service Request.
On Firefox the errors doesn�t disappears and I need to clean manually and after that I�m able to write in this section and open the Service Request.

My platform is Linux
Linux f2c00 2.4.21-15.ELsmp #1 SMP Thu Apr 22 00:18:24 EDT 2004 i686 i686 i386 GNU/Linux

SupportCenter Plus
Version : 6.0.0
Build Number : 6007
Regards
Luiz P�voas