[Thu Sep 08 00:55:27.312076 2016] [core:error] [pid 29207] (14)Bad address: [client xx.xx.xxx.xx:25687] AH00132: file permissions deny server access: (null)
However, the pagespeed_global_admin leads to 404 page not found page, no errors logged. I have relaxed the access permissions in the conf file and double checked that the logdir is accessible by Apache.
mod-pagespeed-stable-1.11.33.2-0.x86_64