[mistwang]

Yes, I noticed the 404 errors as well, pretty strange.

Can you turn on the debug logging for a little while, it will help us analyzing the problem. It will generate tons of log messages for a heavily traffic web site, be careful.

You can use the toggle debug logging feature to turn it on for a little while then turn it off after reproducing the problem, please make sure that the server "log level" is set to "DEBUG". The log file can be sent to bug@litespeedtech.com .