I think our OS is Scientific Linux 6.1 - which is pretty old. Is there a 
way to find out what the "newest" mod_wsgi module will work on it? doing a 
"yum info mod_wsgi" returns version 3.2 as the latest mod_wsgi package.

On Friday, February 12, 2016 at 2:45:31 PM UTC-6, Graham Dumpleton wrote:
>
>
> On 13 Feb 2016, at 5:58 AM, [email protected] <javascript:> wrote:
>
> Today we received an alert from our alert system that the website was 
> down. I've read some topics in here related to this problem but I wanted to 
> provide some information of my configuration, and also see if anyone has 
> any more insight on this problem. I'm running the website using web2py 
> 2.8.2 and apache 2.2.15 with mod_wsgi 3.2. We've also got apache serving 
> some PHP apps.
>
> Here's the related error that appeared the time the website was down:
>
> [Fri Feb 12 00:58:05 2016] [error] [client 195.159.183.42] Script timed 
> out before returning headers: wsgihandler.py, referer: 
> https://www.google.no
>
> Then I also noticed this:
>
> [Fri Feb 12 01:51:41 2016] [error] server reached MaxClients setting, 
> consider raising the MaxClients setting
> [Fri Feb 12 01:52:14 2016] [info] Initial (No.1) HTTPS request received 
> for child 255 (server servername:443)
>
> Not sure if the above is just symptomatic of the wsgihandler.py not 
> returning requests. But it stopped at 255 so I'm guessing MaxClients is set 
> at 256.
>
> Here's the current apache config: 
>
> WSGIDaemonProcess web2py user=webadmin group=webadmin processes=3 
> threads=5 display-name=%{GROUP} maximum-requests=1000 
>
> I'm going to next set the inactivity-timeout=600 to see if it can restart 
> itself... if this problem occurs again. Any more insight on how to track 
> down this issue is much appreciated.
>
>
> Any chance you can upgrade mod_wsgi version?
>
> That version is ancient, unsupported and if not patched by the OS 
> distribution has a security vulnerability in it. More recent versions have 
> better inbuilt features for detecting blocked requests and dumping out 
> information about where they are stuck. A different timeout option will 
> need to be set to enable that though.
>
> Graham
>
>

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