Application engine ran to success but "Not Posted"

Hi Guys,

I am facing this in my PT 8.49 / HRMS 9.0 application. All the processes run to success and posted. Some of the processes intermittently end in Success but "Not Posted" Status. The error message is as follows:

PSUNX failed to post files to the report repository.  Server scheduled to try again on 2014-04-14-11.14.07.000043.  See log    

Java exception thrown: java.io.IOException: Error reading from server    

HTTP Status Code is: 902 (63,7 2)

I am getting this same error message in distribution logs as well..

Another thing, I can see the application engine trace file being generated in log_output folder but when I try to open them, the error comes as unable to open the files, the file does not exist...But I can see the files.