Getting a 503 error - "Service Unavailable The server is temporarily busy, try again later!"

#1
I am getting 503 errors on the pages that I constantly visited on my website. Others are working fine. Everything is working on incognito. This happening on multiple computers. The log file is:

Bash:
2019-12-23 06:01:30.726924 [INFO] [182.75.57.43:53212:HTTP2-1] Redirect: #1, URL: /index.php
2019-12-23 06:03:54.092441 [NOTICE] [182.75.57.43:53224:HTTP2-3#wordpress] oops!  503 Service Unavailable
2019-12-23 06:03:54.092483 [INFO] [182.75.57.43:53224:HTTP2-3] Content len: 0, Request line:
GET /home/ HTTP/1.1
2019-12-23 06:03:54.092489 [INFO] [182.75.57.43:53224:HTTP2-3] Redirect: #1, URL: /index.php
2019-12-23 06:04:03.190383 [NOTICE] [182.75.57.43:53225:HTTP2-1#wordpress] oops!  503 Service Unavailable
2019-12-23 06:04:03.190423 [INFO] [182.75.57.43:53225:HTTP2-1] Content len: 0, Request line:
GET /home/ HTTP/1.1
2019-12-23 06:04:03.190430 [INFO] [182.75.57.43:53225:HTTP2-1] Redirect: #1, URL: /index.php
2019-12-23 06:04:07.373987 [NOTICE] [182.75.57.43:53225:HTTP2-7#wordpress] oops!  503 Service Unavailable
2019-12-23 06:04:07.374026 [INFO] [182.75.57.43:53225:HTTP2-7] Content len: 0, Request line:
GET /home/ HTTP/1.1
2019-12-23 06:04:07.374033 [INFO] [182.75.57.43:53225:HTTP2-7] Redirect: #1, URL: /index.php
2019-12-23 06:18:17.965122 [NOTICE] [182.75.57.43:53433:HTTP2-3#wordpress] oops!  503 Service Unavailable
2019-12-23 06:18:17.965168 [INFO] [182.75.57.43:53433:HTTP2-3] Content len: 0, Request line:
GET /home/ HTTP/1.1
2019-12-23 06:18:17.965174 [INFO] [182.75.57.43:53433:HTTP2-3] Redirect: #1, URL: /index.php
2019-12-23 06:22:37.426483 [NOTICE] [182.75.57.43:53472:HTTP2-11#wordpress] oops!  503 Service Unavailable
2019-12-23 06:22:37.426525 [INFO] [182.75.57.43:53472:HTTP2-11] Content len: 0, Request line:
GET /about-us/ HTTP/1.1
2019-12-23 06:22:37.426531 [INFO] [182.75.57.43:53472:HTTP2-11] Redirect: #1, URL: /index.php
2019-12-23 06:23:57.566353 [NOTICE] [!!!UPDATE!!!] new version 1.6.4.0 is available.
2019-12-23 06:30:51.925845 [NOTICE] [142.93.212.181:52554#wordpress] oops!  503 Service Unavailable
2019-12-23 06:30:51.926441 [INFO] [142.93.212.181:52554] Content len: 0, Request line:
GET /?wp_scrape_key=e5bb151db89e0dfa483128322cb43bbc&wp_scrape_nonce=1067816764 HTTP/1.1
2019-12-23 06:31:04.751638 [NOTICE] [142.93.212.181:52560#wordpress] oops!  503 Service Unavailable
2019-12-23 06:31:04.751683 [INFO] [142.93.212.181:52560] Content len: 0, Request line:
GET /?wp_scrape_key=7199abd8397cb78ab4988ed447fcbf5c&wp_scrape_nonce=956905979 HTTP/1.1
2019-12-23 06:31:59.986620 [NOTICE] [182.75.57.43:53550:HTTP2-1#wordpress] oops!  503 Service Unavailable
2019-12-23 06:31:59.986677 [INFO] [182.75.57.43:53550:HTTP2-1] Content len: 0, Request line:
GET /home/ HTTP/1.1
2019-12-23 06:31:59.986683 [INFO] [182.75.57.43:53550:HTTP2-1] Redirect: #1, URL: /index.php
2019-12-23 06:37:55.909530 [NOTICE] [182.75.57.43:53598:HTTP2-5#wordpress] oops!  503 Service Unavailable
2019-12-23 06:37:55.909576 [INFO] [182.75.57.43:53598:HTTP2-5] Content len: 0, Request line:
GET /about-us/ HTTP/1.1
2019-12-23 06:37:55.909583 [INFO] [182.75.57.43:53598:HTTP2-5] Redirect: #1, URL: /index.php
2019-12-23 06:38:16.624191 [NOTICE] [182.75.57.43:53607:HTTP2-1#wordpress] oops!  503 Service Unavailable
2019-12-23 06:38:16.624231 [INFO] [182.75.57.43:53607:HTTP2-1] Content len: 0, Request line:
GET /about-us/?elementor-preview=3387&ver=1577083089 HTTP/1.1
2019-12-23 06:38:16.624238 [INFO] [182.75.57.43:53607:HTTP2-1] Redirect: #1, URL: /index.php
2019-12-23 06:38:17.790267 [NOTICE] [182.75.57.43:53607:HTTP2-7#wordpress] oops!  503 Service Unavailable
2019-12-23 06:38:17.790320 [INFO] [182.75.57.43:53607:HTTP2-7] Content len: 0, Request line:
GET /about-us/?elementor-preview=3387&ver=1577083089&preview-debug HTTP/1.1
2019-12-23 06:38:17.790328 [INFO] [182.75.57.43:53607:HTTP2-7] Redirect: #1, URL: /index.php
2019-12-23 06:38:32.852723 [NOTICE] [182.75.57.43:53610:HTTP2-1#wordpress] oops!  503 Service Unavailable
2019-12-23 06:38:32.852764 [INFO] [182.75.57.43:53610:HTTP2-1] Content len: 0, Request line:
GET /about-us/?elementor-preview=3387&ver=1577083089&preview-debug HTTP/1.1
2019-12-23 06:38:32.852771 [INFO] [182.75.57.43:53610:HTTP2-1] Redirect: #1, URL: /index.php
2019-12-23 06:39:07.197944 [NOTICE] [182.75.57.43:53614:HTTP2-7#wordpress] oops!  503 Service Unavailable
2019-12-23 06:39:07.197986 [INFO] [182.75.57.43:53614:HTTP2-7] Content len: 0, Request line:
GET /home/ HTTP/1.1
2019-12-23 06:39:07.197993 [INFO] [182.75.57.43:53614:HTTP2-7] Redirect: #1, URL: /index.php
2019-12-23 06:44:49.809501 [NOTICE] [182.75.57.43:53643:HTTP2-1#wordpress] oops!  503 Service Unavailable
2019-12-23 06:44:49.809542 [INFO] [182.75.57.43:53643:HTTP2-1] Content len: 0, Request line:
GET /about-us/?elementor-preview=3387&ver=1577083089&preview-debug HTTP/1.1
2019-12-23 06:44:49.809555 [INFO] [182.75.57.43:53643:HTTP2-1] Redirect: #1, URL: /index.php
2019-12-23 06:47:12.613767 [NOTICE] [182.75.57.43:57746:HTTP2-1#wordpress] oops!  503 Service Unavailable
2019-12-23 06:47:12.613811 [INFO] [182.75.57.43:57746:HTTP2-1] Content len: 0, Request line:
GET / HTTP/1.1
2019-12-23 06:47:30.295049 [NOTICE] [182.75.57.43:57750:HTTP2-1#wordpress] oops!  503 Service Unavailable
2019-12-23 06:47:30.295090 [INFO] [182.75.57.43:57750:HTTP2-1] Content len: 0, Request line:
GET / HTTP/1.1
2019-12-23 06:48:05.587136 [NOTICE] [182.75.57.43:57751:HTTP2-1#wordpress] oops!  503 Service Unavailable
2019-12-23 06:48:05.587183 [INFO] [182.75.57.43:57751:HTTP2-1] Content len: 0, Request line:
GET / HTTP/1.1
2019-12-23 06:50:06.864283 [NOTICE] [LocalWorker::workerExec] VHost:_AdminVHost suExec check uid 999 gid 999 setuidmode 2.
2019-12-23 06:50:06.864379 [NOTICE] [LocalWorker::workerExec] Config[AdminPHP]: suExec uid -1 gid -1 cmd /usr/local/lsws/admin/fcgi-bin/admin_php -c ../conf/php.ini, final uid 999 gid 999.
2019-12-23 06:50:13.970020 [NOTICE] [LocalWorker::workerExec] VHost:_AdminVHost suExec check uid 999 gid 999 setuidmode 2.
2019-12-23 06:50:13.970080 [NOTICE] [LocalWorker::workerExec] Config[AdminPHP]: suExec uid -1 gid -1 cmd /usr/local/lsws/admin/fcgi-bin/admin_php -c ../conf/php.ini, final uid 999 gid 999.
2019-12-23 06:51:36.060319 [NOTICE] [LocalWorker::workerExec] VHost:_AdminVHost suExec check uid 999 gid 999 setuidmode 2.
2019-12-23 06:51:36.060397 [NOTICE] [LocalWorker::workerExec] Config[AdminPHP]: suExec uid -1 gid -1 cmd /usr/local/lsws/admin/fcgi-bin/admin_php -c ../conf/php.ini, final uid 999 gid 999.
2019-12-23 06:51:53.263375 [NOTICE] [182.75.57.43:53836:HTTP2-1#wordpress] oops!  503 Service Unavailable
2019-12-23 06:51:53.263422 [INFO] [182.75.57.43:53836:HTTP2-1] Content len: 0, Request line:
GET /about-us/?elementor-preview=3387&ver=1577083089&preview-debug HTTP/1.1
2019-12-23 06:51:53.263442 [INFO] [182.75.57.43:53836:HTTP2-1] Redirect: #1, URL: /index.php
2019-12-23 06:52:02.331307 [NOTICE] [182.75.57.43:57868:HTTP2-1#wordpress] oops!  503 Service Unavailable
2019-12-23 06:52:02.331355 [INFO] [182.75.57.43:57868:HTTP2-1] Content len: 0, Request line:
GET / HTTP/1.1
2019-12-23 06:54:57.272549 [NOTICE] [LocalWorker::workerExec] VHost:_AdminVHost suExec check uid 999 gid 999 setuidmode 2.
2019-12-23 06:54:57.272596 [NOTICE] [LocalWorker::workerExec] Config[AdminPHP]: suExec uid -1 gid -1 cmd /usr/local/lsws/admin/fcgi-bin/admin_php -c ../conf/php.ini, final uid 999 gid 999.
2019-12-23 06:55:11.629991 [NOTICE] [182.75.57.43:53687:HTTP2-931#wordpress] oops!  503 Service Unavailable
2019-12-23 06:55:11.630034 [INFO] [182.75.57.43:53687:HTTP2-931] Content len: 0, Request line:
GET /home/ HTTP/1.1
2019-12-23 06:55:11.630040 [INFO] [182.75.57.43:53687:HTTP2-931] Redirect: #1, URL: /index.php
2019-12-23 06:55:37.073099 [NOTICE] sendKillCmdToWatchdog: 'extappkill:29008:-3:0'.
2019-12-23 06:55:37.100426 [NOTICE] [28233] Cmd from child: [extappkill:29008:-3:0]
2019-12-23 06:55:37.100529 [INFO] Failed to get process [29008] start time, not running, skip killing.
2019-12-23 06:56:07.296517 [NOTICE] [LocalWorker::workerExec] VHost:_AdminVHost suExec check uid 999 gid 999 setuidmode 2.
2019-12-23 06:56:07.296576 [NOTICE] [LocalWorker::workerExec] Config[AdminPHP]: suExec uid -1 gid -1 cmd /usr/local/lsws/admin/fcgi-bin/admin_php -c ../conf/php.ini, final uid 999 gid 999.
How can I fix this problem ?
 
#2
For this
Code:
2019-12-23 06:03:54.092483 [INFO] [182.75.57.43:53224:HTTP2-3] Content len: 0, Request line:
GET /home/ HTTP/1.1
2019-12-23 06:03:54.092489 [INFO] [182.75.57.43:53224:HTTP2-3] Redirect: #1, URL: /index.php
2019-12-23 06:04:03.190383 [NOTICE] [182.75.57.43:53225:HTTP2-1#wordpress] oops!  503 Service Unavailable
I am not sure what error occurred during serving it.
You can toggle DEBUG log and try this URL again.
 
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