503 service temporarily unavailable solution

Apache has always had this error from time to time. It has been found that the Apachedmod_bw module is set up

ForceBandWidthModule On BandWidthModule On BandWidth all 1024000 MaxConnection all 150

In this configuration Under the file, according to the documentation, it can support the concurrency of Apache 150 per second, but the actual situation is that there are only a few concurrent concurrently, very helpless. After MaxConnection is increased, the situation still has not improved.

Finally in the official documentation: Any connection over Max, will get a 503 Service Temporarily Unavailable

This fact is confirmed, but Apache has been tested and will report up to a dozen concurrently per second. 503 Service Temporarily Unavailabled error

After finally modifying the configuration file to MaxConnection all 0, the problem is solved!