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"Dropping TCP Segment" Preventing downloads

Hello everyone

Came across an issue today whereby users are unable to download or upload files, I checked the logs on the router (Cisco 800 firewall) and got this error message:

*Feb 21 14:49:13.970: %FW-4-TCP_OoO_SEG: Dropping TCP Segment: seq:3251842004 15

00 bytes is out-of-order; expected seq:3251814264. Reason: TCP reassembly queue

overflow - session 192.168.0.23:55957 to 72.20.105.78:80

*Feb 21 14:51:10.838: %FW-4-TCP_OoO_SEG: Dropping TCP Segment: seq:4099311873 15

00 bytes is out-of-order; expected seq:4099287053. Reason: TCP reassembly queue

overflow - session 192.168.0.250:27338 to 80.249.99.148:80

*Feb 21 14:51:36.414: %FW-4-TCP_OoO_SEG: Deleting session as expected TCP segmen

t with seq:4099287053 has not arrived even after 25 seconds - session 192.168.0.

250:27338 to 80.249.99.148:80

Users say they can't download files usually around 50MB or larger and intermitently they cannot upload files.

I had a look around in the Cisco documents and found a potential solution - http://www.cisco.com/en/US/docs/ios/12_4t/12_4t11/ht_ooop.html
However I'm wondering if there is any other commands I should check first?

I'm only a CCNA level, so feeling out of my depth here!

Have attached the running config as well in case that helps.

Many thanks for looking

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