Error authorizing your site. Please contact support.

I installed jetpack through the install link provided on wordpress.com for my self hosted site running on php7 and nginx.

When trying to connect to jetpack I received the following error:
Error authorizing your site. Please contact support.

A few seconds later my server crashed. I got these error messages:

XXXXXX kernel: [8552764.596491] php-fpm7.0[3501]: segfault at 7ffcbc7f2ff8 ip 00007fa2f50c216a sp 00007ffcbc7f2fa0 error 6 in libpcre.so.3.13.1[7fa2f5075000+6c000]
Aug 8 13:20:02 XXXXXX kernel: [8552770.808255] php-fpm7.0[3514]: segfault at 7ffcbc7f2fd0 ip 00007fa2f50c21a6 sp 00007ffcbc7f2fc0 error 6 in libpcre.so.3.13.1[7fa2f5075000+6c000]
Aug 8 13:20:07 XXXXXX kernel: [8552775.283143] php-fpm7.0[3526]: segfault at 7ffcbc7f2fd0 ip 00007fa2f50c21a6 sp 00007ffcbc7f2fc0 error 6 in libpcre.so.3.13.1[7fa2f5075000+6c000]
Aug 8 13:20:09 XXXXXX kernel: [8552777.278976] php-fpm7.0[3536]: segfault at 7ffcbc7f2ff8 ip 00007fa2f50c216a sp 00007ffcbc7f2fa0 error 6 in libpcre.so.3.13.1[7fa2f5075000+6c000]
Aug 8 13:20:09 XXXXXX kernel: [8552777.594595] php-fpm7.0[3537]: segfault at 7ffcbc7f2fd0 ip 00007fa2f50c21a6 sp 00007ffcbc7f2fc0 error 6 in libpcre.so.3.13.1[7fa2f5075000+6c000]

2016/08/08 13:03:13 [error] 13320#13320: *484127 upstream sent too big header while reading response header from upstream, client: XXXXXXXXXX, server: XXXXXXXXXX, request: “POST /xmlrpc.php?for=jetpack HTTP/1.0”, upstream: “fastcgi://unix:/var/run/php/php7.0-fpm.sock:”, host: “XXXXXXXXXX”
2016/08/08 13:04:59 [error] 13320#13320: *484090 upstream timed out (110: Connection timed out) while reading response header from upstream, client: XXXXXXXXXX, server: XXXXXXXXXX, request: “GET /wp-admin/plugins.php HTTP/1.1”, upstream: “fastcgi://unix:/var/run/php/php7.0-fpm.sock”, host: “www.thedapperman.co.u$
2016/08/08 13:06:05 [error] 13320#13320: *484090 upstream timed out (110: Connection timed out) while reading response header from upstream, client: XXXXXXXXXX, server: XXXXXXXXXX, request: “GET /wp-admin/plugins.php HTTP/1.1”, upstream: “fastcgi://unix:/var/run/php/php7.0-fpm.sock”, host: “www.thedapperman.co.u$
2016/08/08 13:07:52 [error] 13318#13318: *484348 upstream timed out (110: Connection timed out) while reading response header from upstream, client: XXXXXXXXXX, server: XXXXXXXXXX, request: “GET /wp-admin/index.php HTTP/1.1”, upstream: “fastcgi://unix:/var/run/php/php7.0-fpm.sock”, host: “XXXXXXXXXX”
2016/08/08 13:09:09 [error] 13318#13318: *484348 upstream timed out (110: Connection timed out) while reading response header from upstream, client: XXXXXXXXXX, server: XXXXXXXXXX, request: “GET /wp-admin/index.php HTTP/1.1”, upstream: “fastcgi://unix:/var/run/php/php7.0-fpm.sock”, host: “XXXXXXXXXX”
2016/08/08 13:09:12 [error] 13317#13317: *484390 upstream timed out (110: Connection timed out) while reading response header from upstream, client: XXXXXXXXXX, server: XXXXXXXXXX, request: “GET / HTTP/1.1”, upstream: “fastcgi://unix:/var/run/php/php7.0-fpm.sock”, host: “XXXXXXXXXX”, referrer: “https$
2016/08/08 13:09:14 [error] 13317#13317: *484394 upstream timed out (110: Connection timed out) while reading response header from upstream, client: XXXXXXXXXX, server: XXXXXXXXXX, request: “HEAD / HTTP/1.1”, upstream: “fastcgi://unix:/var/run/php/php7.0-fpm.sock”, host: “XXXXXXXXXX”, referrer: “http$
2016/08/08 13:10:34 [error] 13317#13317: *484436 upstream timed out (110: Connection timed out) while reading response header from upstream, client: XXXXXXXXXX, server: XXXXXXXXXX, request: “GET / HTTP/1.1”, upstream: “fastcgi://unix:/var/run/php/php7.0-fpm.sock”, host: “XXXXXXXXXX”, referrer: “https$
2016/08/08 13:10:46 [error] 13317#13317: *484390 upstream timed out (110: Connection timed out) while reading response header from upstream, client: XXXXXXXXXX, server: XXXXXXXXXX, request: “GET /wp-admin/index.php HTTP/1.1”, upstream: “fastcgi://unix:/var/run/php/php7.0-fpm.sock”, host: “XXXXXXXXXX”

https://wordpress.org/plugins/jetpack/