Error 522 with Cloudflare

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Hello I have always error 522 with Cloudflare and SSL I use 2 url the first is via Cloudflare with full ssl https://example.com and second is with my ip and without Cloudflare http://XXX.XXX. If i start benchmaking mysql with AB command (or with simple ajax request) the siteweb with Cloudflare down imediatly with error 522 but the website with my IP never down and continue to work faster

I have a free plan in Cloudflare with a auto signed SSL certificat in my server with openssl

openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /etc/apache2/ssl/s1.key -out /etc/apache2/ssl/s1.crt

I changed my.cnf for limit max_user_connections to 20 but not working i dont have error in apache and syslog

My server is a debian 7 3 cores 4gb in OVH

top

top - 07:26:58 up 15:25,  2 users,  load average: 2.23, 2.28, 2.18
Tasks:  57 total,   2 running,  55 sleeping,   0 stopped,   0 zombie
%Cpu(s):  8.1 us,  1.2 sy,  0.0 ni, 88.7 id,  2.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem:   4194304 total,   354532 used,  3839772 free,        0 buffers
KiB Swap:   131072 total,        0 used,   131072 free,   159668 cached

  PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND
11715 mysql     20   0  585m 100m 7824 S  28.1  2.5 117:17.15 mysqld
14469 www-data  20   0  222m  12m 4312 R   2.9  0.3   0:20.86 apache2
14567 www-data  20   0  222m  11m 3604 S   2.0  0.3   0:12.89 apache2
14579 www-data  20   0  221m  11m 3612 S   2.0  0.3   0:07.69 apache2
 2599 root      20   0 24364 2208 1296 S   1.0  0.1  10:53.41 htop
 5317 root      20   0 24292 2184 1296 S   0.7  0.1  10:41.42 htop
14577 www-data  20   0  221m  10m 3400 S   0.7  0.3   0:08.94 apache2
    1 root      20   0 10604  796  664 S   0.0  0.0   0:15.10 init
    2 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kthreadd/46179
    3 root      20   0     0    0    0 S   0.0  0.0   0:00.00 khelper/46179
    4 root      20   0     0    0    0 S   0.0  0.0   0:00.00 rpciod/46179/0
    5 root      20   0     0    0    0 S   0.0  0.0   0:00.00 rpciod/46179/1
    6 root      20   0     0    0    0 S   0.0  0.0   0:00.00 rpciod/46179/2
    7 root      20   0     0    0    0 S   0.0  0.0   0:00.00 rpciod/46179/3
    8 root      20   0     0    0    0 S   0.0  0.0   0:00.00 rpciod/46179/4
    9 root      20   0     0    0    0 S   0.0  0.0   0:00.00 rpciod/46179/5
   10 root      20   0     0    0    0 S   0.0  0.0   0:00.00 rpciod/46179/6
   11 root      20   0     0    0    0 S   0.0  0.0   0:00.00 rpciod/46179/7
   12 root      20   0     0    0    0 S   0.0  0.0   0:00.00 nfsiod/46179
 1533 root      20   0 30764  488  244 S   0.0  0.0   0:00.00 syslog-ng
 1534 root      20   0 88480 3572 2480 S   0.0  0.1   0:02.10 syslog-ng
 1658 messageb  20   0 29760  556  296 S   0.0  0.0   0:00.00 dbus-daemon
 1676 bind      20   0  202m  22m 2324 S   0.0  0.5   0:02.13 named
 1682 root      20   0 49888 1236  628 S   0.0  0.0   0:00.37 sshd
 1717 root      20   0 72552 2132  524 S   0.0  0.1   0:19.69 sendmail-mta
 2295 root      20   0 20844 1024  776 S   0.0  0.0   0:02.76 cron
 2398 proftpd   20   0 99.7m 1944  500 S   0.0  0.0   0:09.15 proftpd
 2422 root      20   0 52324 1672 1152 S   0.0  0.0   0:00.02 login
 2423 root      20   0 14532  836  676 S   0.0  0.0   0:00.00 getty
 2424 root      20   0 14532  832  676 S   0.0  0.0   0:00.00 getty
 2425 root      20   0 14532  828  676 S   0.0  0.0   0:00.00 getty
 2426 root      20   0 14532  832  676 S   0.0  0.0   0:00.00 getty
 2427 root      20   0 14532  832  676 S   0.0  0.0   0:00.00 getty
 2506 root      20   0 24368 1964  776 S   0.0  0.0   0:46.24 screen
 2507 root      20   0 19944 2272 1672 S   0.0  0.1   0:02.25 bash
 2508 root      20   0 19916 2176 1604 S   0.0  0.1   0:00.02 bash
 5316 root      20   0 19916 2176 1604 S   0.0  0.1   0:00.00 bash
 9522 root      20   0  220m  10m 4436 S   0.0  0.3   0:36.96 apache2
10166 root      20   0 19924 2216 1636 S   0.0  0.1   0:00.00 bash
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damoncloudflare On

A 522 error generally indicates something blocking requests from our IPs on your server or hosting provider.

Additional troubleshooting tips for a 522 error and CloudFlare.