I was configuring MediaWiki to allow uploads and was getting an error in the browser about the POST data being too large (“does not allow request data with POST requests, or the amount of data provided in the request exceeds the capacity limit.”). I had a look in the Apache error log and found:
[Thu Feb 23 16:12:45 2012] [error] [client 220.127.116.11] request body exceeds m aximum size (131072) for SSL buffer, referer: https://www.jj5.net/morpheus/Speci al:Upload [Thu Feb 23 16:12:45 2012] [error] [client 18.104.22.168] could not buffer messa ge body to allow SSL renegotiation to proceed, referer: https://www.jj5.net/morp heus/Special:Upload
So I did some research. I found this document, File upload size which suggested editing /etc/php5/apache2/php.ini which I did:
upload_max_filesize = 20M post_max_size = 80M
That didn’t fix the problem though. I found Request entity too large which suggested checking my setting for LimitRequestBody, but that wasn’t the problem either.
Eventually I found Bug 491763 – HTTPS+SSLVerifyClient require in <Directory>+big POST = Apache error which suggested I needed to apply the SSLRenegBufferSize directive which I did like this:
<Location /morpheus> SSLVerifyClient require SSLVerifyDepth 1 SSLRenegBufferSize 20971520 </Location>
And then after restarting Apache the problem was solved.