Search Engine: Elastic

Article ID: 129225, created on Aug 5, 2016, last review on Jan 20, 2017

  • Applies to:
  • Operations Automation


Sometimes OA Control Panel does not load a page and shows the message:

Service Unavailable. The corresponding service is not available at the moment, try it within 2-3 minutes.

ssl_error_log on the branding host contains the errors during the outage:

[Mon Jul 11 07:29:42 2016] [error] [client] [Mon Jul 11 07:30:12 2016] [error] [client] (70007)The timeout specified has expired: proxy: error reading status line from remote server, referer:
[Mon Jul 11 07:29:42 2016] [error] [client] [Mon Jul 11 07:30:12 2016] [error] [client] proxy: Error reading from remote server returned by /servlet/Turbine/frm/single/, referer:

At the same time, UI part starts building the page, and it takes a lot of time eventually:

2016-07-11 07:29:42,891            c-123 DEBUG  OUT                  PAGE BUILD STARTED
2016-07-11 07:30:31,551            c-123 DEBUG  OUT                  PAGE BUILD FINISHED: [48660 ms]

Within this session, there are methods that take longer than expected, for example:

2016-07-11 07:29:42,894            c-123 DEBUG  CORBA                #583476: Plesk._hubStub.acquire_own_cred(undefined) >>> entry
2016-07-11 07:30:13,240            c-123 DEBUG  CORBA                #583476: Plesk._hubStub.acquire_own_cred(undefined) <<< exit [30346]

2016-07-11 07:30:13,252            c-123 DEBUG  CORBA                #583488: Plesk._BrandStub.getBrand(user_id=6 (su_user_id=6)) >>> entry
2016-07-11 07:30:31,442            c-123 DEBUG  CORBA                #583488: Plesk._BrandStub.getBrand(user_id=6 (su_user_id=6)) <<< exit [18190]

The calls are processed slowly on the OA MN backend.


Database server slowness or deadlocks cause simple methods get processed longer than usually.


In case the issue happens frequently, investigate the reason behind the slow queries and eliminate it.

If the issue is rare, it is enough to raise Apache HTTP timeout on all hosts, serving CP requests:

[root@ng01 ~]# grep ^Timeout /etc/httpd/conf/httpd.conf
Timeout 60

# service httpd restart

and avoid occasional failures during page loads.

5356b422f65bdad1c3e9edca5d74a1ae caea8340e2d186a540518d08602aa065 e12cea1d47a3125d335d68e6d4e15e07

Email subscription for changes to this article
Save as PDF