Not able to download big files from cPanel when accessed via the service subdomain

Symptoms

It's not possible to download and/or upload big files, usually files bigger than 500 MB, from the cPanel account when accessed via the service subdomain "CPANEL.domain.com". You will see a similar error in the Apache error log:

CONFIG_TEXT: Request body size: 105480908 is too big!

Cause

When using the service (proxy) subdomain to access cPanel, the data passes through the web server. In this case, LiteSpeed. 

LiteSpeed sets a Max Request Body at 500MB by default - but it can be changed.

# grep -Ei "maxReqBodySize" /usr/local/lsws/conf/httpd_config.xml
<maxReqBodySize>500M</maxReqBodySize>

Resolution

Access cPanel over port 2083 directly, or raise the limitation in LiteSpeed:

1. Log in to SSH or access the WHM Terminal as the root user.
2. Edit /usr/local/lsws/conf/httpd_config.xml
3. Update the maxReqBodySize to a higher value that meets your needs.

4. Restart LiteSpeed with this command:

   # /scripts/restartsrv_httpd

Additional Resources

LiteSpeed Documenation | Configuration | #maxreqbodysize