503 Service Unavailable

[furimedia]

Hi I have multiple sites hosted in my server and some sites work fine. But on others, I get "503 Service Unavailable The server is temporarily busy, try again later!".

I check the logs and it only find [INFO] and [NOTICE] errors.

Any idea why this is happening?

These sites use Zend Framework by the way.

Thanks in advance

 

[mistwang]

Is this new installation or upgrade from earlier LSWS release?

 

[furimedia]

This was a new install of the latest LSWS

 

[mistwang]

Anything in stderr.log?

You can try increasing the memory limit of lsphp external app.
check http://www.litespeedtech.com/support/wiki/doku.php?id=litespeed_wiki:php:lsapi#trouble_shooting