Sonicwall Global VPN Client Disconnect

I am running SBS2003 Premium Edition. I am using Sonicwall TZ205. My remote office is connected through Global VPN Client. Remote user disconnect several times during the day. Sonicwall MTU is set for 1400 MTU, but when I ping private and public address, I can only ping up to 500 MTU, if I ping above 500 I get request timed out. How can I fix this issue.
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Blue Street TechConnect With a Mentor Last KnightsCommented:
Hi Wizkid003,

I'd take a look and make sure your settings are correct for the VPN tunnel. Follow these steps & match the settings: Once you have an operational & stable tunnel we can increase security past what the article explains.

Regarding MTU size...I'm not sure how you are checking that but take a look at this article. It will explain how to determine and change your MTU so it's sized appropriately. Here's a step-by-step:

Let me know how it goes.
Blue Street TechLast KnightsCommented:
Any update on this?
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Wizkid003Author Commented:
I change the MTU on the Sonicwall from 1500 to 1404 reboot and everything is working fine now.
Blue Street TechLast KnightsCommented:

If you haven't done so already tailor your MTU by decrementing it by 8 starting at 1500 until you get 0% loss. Open cmd prompt and use 'Ping -f -l 1500' to test. Here is a step-by-step:
Blue Street TechLast KnightsCommented:
Is there anything else I can help you with?
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