Issue with caldav sync DoS Protection Activated

[kerridge]

Hi I am encountering an issue when synchronising my calendar with caldav. It's quite a big calendar, synchronising with Outlook using caldav synchroniser.

Anyway, the sync causes the following error:-

DoS Protection Activated; PROPFIND larger than 100k discarded

I have googled and can't find this anywhere on the internet, so can't use caldav any more.

Could it be some kind of attachment on a calendar item causing a size limit to be exceeded? I vaguely recall dragging an email to the calendar to create a calendar entry..

If anyone could cast any light at all on this it would be very useful.

Kerry

The error is found in the file: /usr/local/cpanel/logs/cpdavd_error_log

 

[kerridge]

I have found where the error text can be found:

/usr/local/cpanel/Cpanel/Httpd.pm:
        if ( int $httphead->header('content-length') > 100000 ) {
            print STDERR "DoS Protection Activated; PROPFIND larger than 100k discarded\n";
            $self->force_last_request();
        }

Here are my server details (root access)

/etc/redhat-release:CentOS release 5.11 (Final)
/usr/local/cpanel/version:11.56.0.43
/var/cpanel/envtype:xen pv
CPANEL=11.56
Server version: Apache/2.2.31 (Unix)
Server built:   Oct 28 2016 14:05:39
Cpanel::Easy::Apache v3.34.7 rev9999
PHP 5.6.27 (cli) (built: Oct 28 2016 14:13:36)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
    with the ionCube PHP Loader (enabled) + Intrusion Protection from ioncube24.com (unconfigured) v5.1.1, Copyright (c) 2002-2016, by ionCube Ltd.
    with Zend Guard Loader v3.3, Copyright (c) 1998-2014, by Zend Technologies
mysql  Ver 14.14 Distrib 5.6.33, for Linux (x86_64) using  EditLine wrapper

 

[kerridge]

I've changed /usr/local/cpanel/Cpanel/Httpd.pm:

        #if ( int $httphead->header('content-length') > 100000 ) {
        #    print STDERR "DoS Protection Activated; PROPFIND larger than 100k discarded\n";
        #    $self->force_last_request();
        #}
        #elsif ( int $httphead->header('content-length') > 0 ) {
        if ( int $httphead->header('content-length') > 0 ) {

It now works.

Is there any way of resolving this more elegantly?

 

[Infopro]

It's quite a big calendar, synchronising with Outlook using caldav synchroniser.

Please feel free to open a ticket directly to cPanel Technical Support about this. I would think if this is an issue not many come across but you have due to the large calendar, they'd like to know about it to make the cPanel product better.

 

[kerridge]

Cpanel concurred and advised that I create a feature request, I have now located here They also advised I could use the standardised hook system to make the change more permanent.