Issue
Some users are getting a 503 error (around 5-6 users a day) and the error does not go away with a refresh of the page. Once that error pops-up any page requested on the domain throws the same 503 error. There is no specific website or domain from the ones configured on the server where this error is being faced it is just random.
Errors in the log
(Apache)
AH01067: Failed to read FastCGI header
[proxy_fcgi:error] [pid 30805:tid 140427730589440](104)Connection reset by peer: [client xxx.xxx.xxx.xxx:41520] AH01075: Error dispatching request to :
(Syslog)
localhost kernel: [2043980.836123] php-fpm[65943]: segfault at 7fff2417ab40 ip 000056425a0108dc sp 00007fff2417ab20 error 6 in php-fpm[564259d59000+4c4000]
Server Environment
Ubuntu 18.04.1 LTS
CPU: 1 processor with 16 cores
RAM: 48G
Plesk Onyx Version 17.8.11 Update #35
PHP 7.2.13
FPM application served by Apache
SSL enabled on all domains
Nginx Proxy mode enabled along with smart static files processing
Linux+Nginx+Apache2+PHP-FPM-7.2+HTTP2+MySQL (mariadb)
15 domains configured with the above settings all running under a common wordpress multisite installation
Background
We recently migrated to the above server, before this we were using PHP 5.6.33 with FastCGI and did not have any such issues.
Our analysis
- No issues with the availability of CPU/memory as the average load is around 3-4 and there is at least 24G of memory available
- We are unable to replicate the issue and it just happens
- We have found that on the web browser if the issue occurs we can delete the wordpress cookie 'wordpress_logged_in_*******' and that fixes the issue and allows to open the requested page instead of a 503
We are still trying to find the cause for this issue but if any of you have faced this or a similar problem please share your version and the solution if you were able to find it.
Thank you.
Some users are getting a 503 error (around 5-6 users a day) and the error does not go away with a refresh of the page. Once that error pops-up any page requested on the domain throws the same 503 error. There is no specific website or domain from the ones configured on the server where this error is being faced it is just random.
Errors in the log
(Apache)
AH01067: Failed to read FastCGI header
[proxy_fcgi:error] [pid 30805:tid 140427730589440](104)Connection reset by peer: [client xxx.xxx.xxx.xxx:41520] AH01075: Error dispatching request to :
(Syslog)
localhost kernel: [2043980.836123] php-fpm[65943]: segfault at 7fff2417ab40 ip 000056425a0108dc sp 00007fff2417ab20 error 6 in php-fpm[564259d59000+4c4000]
Server Environment
Ubuntu 18.04.1 LTS
CPU: 1 processor with 16 cores
RAM: 48G
Plesk Onyx Version 17.8.11 Update #35
PHP 7.2.13
FPM application served by Apache
SSL enabled on all domains
Nginx Proxy mode enabled along with smart static files processing
Linux+Nginx+Apache2+PHP-FPM-7.2+HTTP2+MySQL (mariadb)
15 domains configured with the above settings all running under a common wordpress multisite installation
Background
We recently migrated to the above server, before this we were using PHP 5.6.33 with FastCGI and did not have any such issues.
Our analysis
- No issues with the availability of CPU/memory as the average load is around 3-4 and there is at least 24G of memory available
- We are unable to replicate the issue and it just happens
- We have found that on the web browser if the issue occurs we can delete the wordpress cookie 'wordpress_logged_in_*******' and that fixes the issue and allows to open the requested page instead of a 503
We are still trying to find the cause for this issue but if any of you have faced this or a similar problem please share your version and the solution if you were able to find it.
Thank you.
Last edited: