Pix keeps hanging

I have a pix 501 that keeps hanging and prevents access into and out of the network. A hard reset brings it back to life. How can I troubleshoot the problem? How do I configure logging?
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does clear nat translations help?
what is mentioned in sh log?
Milkybar-kidAuthor Commented:
Can you give me more details please?
When I try to enable logging using PDM I get a message that it cannot communicate with the PIX. It seemed to login initially OK via PDM.
can you login via telnet to switch and issue:
show xlate to see nat translations
clear xlate to clear active nat translations. sometimes it is possible that translation table is filled up and no new connections extablished

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