WSA Zero window issue.

[mothira.573]

Hello Team.

We are using Version: 8.8.0-085 for Web and we are facing slow upload speed for 1G connection we are getting only less than 100Mbps via wsa. Is there any bug for this version ?

From the packet captures we are able to see proxy is sending TCP ZeroWindow continuously, is there any way to resolve this

980    36.706741    192.168.10.20   192.168.20.12    TCP    66    [TCP ZeroWindow] 53410 → 3128 [ACK] Seq=304 Ack=209981 Win=0 Len=0 TSval=53170124 TSecr=452846465

[Tao Yang]

Firstly please bear in mind the working as a proxy server, WSA has network tweak to ensure all users will not be impacted by a large download/upload.

According to your posted one package, it looks a client connection between client machine and WSA. It is quite difficult to determine the cause as quite a lot issues could cause this like WSA could not complete the upload to the server quickly etc.

[David Niemann]

What is the network tweak? Does it still apply in 9.x and up?

[Tao Yang]

We have some changes in version 9.x and version 10.x. Especially we introduced a new command "networktunning" from version 9.x.

Here is quoted from version 9.x release notes.

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CLI command, networktuning, which can be used to change send and receive buffer sizes. Use carefully; see the section “Upload/Download Speed Issues” in the Troubleshooting chapter of the user guide for more information.

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