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Intermittent ACK Not Received

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derekvw

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We recently switched out our router to a Fortigate 90E. Ever since then, we've been experiencing intermittent ACK not received issues. I can have 10 calls come in fine and then one drop after 32 seconds and then the next 10 work just fine.

The Fortigate is configured to have a public DNS server as primary and our internal Windows Server DNS as secondary.

When I run wireshark across the interface, I do notice a few TCP retransmission requests.

Any ideas on how I can figure this out?

Thanks!
 
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