Sonicwall TZ200 with Cisco VPN client

Hi,
We recently upgraded our firewall to a Sonicwall TZ200 and now our Cisco VPN clients that we use to connect to remote customer sites do not work.

The VPNs connect initially, but drop after a couple of minutes. Sonicwall log records "TCP connection dropped".

Is there any configuration that can fix this? Thanks in advance for any help.
algernon23Asked:
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mredfelixCommented:
Sounds like a nat issue.
Try giving one machine static ip and see if it connects.
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algernon23Author Commented:
@mredfelix: thanks for the response. Can you expand a bit on what you mean by a nat issue and why a static IP will help? I'm sorry but I don't really understand what you are suggesting. Thanks.
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digitapCommented:
need more information from the log.  Go to the log area and click on Categories.  Make sure the log level is set to debug.  Also, you'll see several categories on this page.  Click the check boxes above each column to select all the categories in that column.  Then, go back to your log.  Begin a ping to a host on the remote side of the VPN.  You should see something there regarding why the VPN is failing.  You should see which phase (Phase 1 or Phase 2) it's failing in.  If Phase 1, then it's probably the shared secret or your peer/destination networks don't match.  Phase 2, then check out the proposal tab.

Post the log information when you get it if you have more questions.
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algernon23Author Commented:
@dititap: Thank you for your help. We have found a workaround, which is to use UDP instead of TCP. This works to prevent the disconnections. As time permits we will try to generate the logging as you suggest.
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digitapCommented:
great...let me know!
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digitapCommented:
Glad I could help and thanks for the points!
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