I'm having this problem if I login to my PIX either a PIX 501 or 506E, the PDM will lose it connection with the PIX after so many minutes. If i go to apply a change or save a config, PDM will tell me it can't communicate with the PIX. I would then have to close my web browser and open a new connection.
I'm running PIX OS 6.3(5) and PDM 3.0(4) with IE 6, Java 1.6.0 on Windows XP
Is there anyway to prevent this from happening??