Tomcat error popping up on rotation servers in rapid succession

[Jim Fox]

> 
> Earlier today, two of our three Shibboleth IdP servers went down in rapid succession, seemingly for the same reason. I originally suspected it was
> a metadata error since we've seen a few of those recently, but it appears to have been Tomcat-related.
> 
> [error] ajp_read_header: ajp_ilink_receive failed
> [error] (70007)The timeout specified has expired: proxy: read response failed from (null) (localhost)
> [error] (70007)The timeout specified has expired: proxy: read response failed from 127.0.0.1:8009 (localhost)
> [error] (70007)The timeout specified has expired: ajp_ilink_receive() can't receive header
>

Tomcat's logs would be more to the point.  Even the IdP's own process.log.

Jim