A site wifi disconnected after transferring pictures by WeChat

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Problem phenomenon: The customer's normal wireless service is normal, but in the process of transmitting pictures in the cell phone client, the client will be offline once it transmits several times.

Some basic troubleshooting:

1)      the current failure of the client are cell phone clients, computers do not have this problem.

2)      the reason for the downlink is 1025, the client is unlinked:

display system internal wlan client history-record help reason-code 1025

Received deauthentication message in Run state.

3)      try to replace the unencrypted service template problem remains.

For this problem, it looks like there is a little endpoint tendency. The terminals with the problem are cell phones, and the sites are all Huawei phones and Xiaomi phones. And definitely all occurred after WeChat transmission of multiple pictures. A single picture or video alone does not trigger the problem. All other Internet behaviors are also normal.

The configuration of AC seems to be simple and normal with no obvious errors.

So intuitively the problem is another one: triggered by other devices and eventually manifested in the wireless.

There is often a feature called "WLAN+" or "WLAN Assistant" in the configuration of Android phones, take Xiaomi phones for example:

The logic behind this feature is that the phone will regularly detect the external server, and when the detection fails, the wifi network is considered unavailable, and the phone will then "smartly" choose data traffic to send. In this perspective and our problem is highly consistent. So try to let the site to turn off this "WLAN Assistant" function after the problem is improved.

So what network factors caused the "WLAN Assistant" detection of external network failure?

After confirming one by one, a firewall device was finally found to exist. When the firewall device was bypassed, the problem no longer occurred.

So this problem on site is a typical problem of other network factors that finally manifest themselves as poor wifi experience.

The logic behind it actually has nothing to do with wifi, but it is because wifi is at the forefront of customer perception and is most likely to be challenged.