Hi All,
I am new in osTicket world.
Manage to install it on Centos8 VM on my laptop for testing purposes.
Seems to all be working fine except to Emails.
When I am trying to update my email settings to use authentication in SMTP it fails to save settings when i put login and password . I am getting:

Service Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later

Please see attached screens from settings and /etc/www/httpd/logs/access_log and /etc/www/httpd/logs/error_log

Any helps hints will be much appriciate. Many thanks


ACCESS_LOG
192.168.0.56 - - [08/Nov/2019:08:27:22 +0100] "GET /osTicket/scp/system.php HTTP/1.1" 302 13 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:27:22 +0100] "GET /osTicket/scp/login.php HTTP/1.1" 422 5971 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:27:25 +0100] "GET /osTicket/scp/ HTTP/1.1" 302 13 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:27:25 +0100] "GET /osTicket/scp/login.php HTTP/1.1" 422 5971 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:27:25 +0100] "GET /osTicket/scp/logo.php?login HTTP/1.1" 200 8660 "http://192.168.0.60/osTicket/scp/login.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:27:26 +0100] "GET /osTicket/scp/logo.php?backdrop HTTP/1.1" 200 130254 "http://192.168.0.60/osTicket/scp/css/login.css" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:27:26 +0100] "GET /favicon.ico HTTP/1.1" 404 209 "http://192.168.0.60/osTicket/scp/login.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:27:39 +0100] "POST /osTicket/scp/login.php HTTP/1.1" 200 45 "http://192.168.0.60/osTicket/scp/login.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:27:39 +0100] "GET /osTicket/scp/ HTTP/1.1" 200 23350 "http://192.168.0.60/osTicket/scp/login.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:27:40 +0100] "GET /osTicket/scp/autocron.php HTTP/1.1" 200 42 "http://192.168.0.60/osTicket/scp/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:27:42 +0100] "GET /osTicket/scp/admin.php HTTP/1.1" 302 56417 "http://192.168.0.60/osTicket/scp/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:27:42 +0100] "GET /osTicket/scp/settings.php HTTP/1.1" 200 56417 "http://192.168.0.60/osTicket/scp/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:27:42 +0100] "GET /osTicket/scp/autocron.php HTTP/1.1" 200 42 "http://192.168.0.60/osTicket/scp/settings.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:27:44 +0100] "GET /osTicket/scp/emails.php?pjax=%23pjax-container HTTP/1.1" 200 8502 "http://192.168.0.60/osTicket/scp/settings.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:27:53 +0100] "POST /osTicket/scp/emails.php HTTP/1.1" 200 14433 "http://192.168.0.60/osTicket/scp/emails.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:27:53 +0100] "GET /osTicket/scp/autocron.php HTTP/1.1" 200 42 "http://192.168.0.60/osTicket/scp/emails.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:28:02 +0100] "POST /osTicket/scp/emails.php HTTP/1.1" 200 14453 "http://192.168.0.60/osTicket/scp/emails.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:28:02 +0100] "GET /osTicket/scp/autocron.php HTTP/1.1" 200 42 "http://192.168.0.60/osTicket/scp/emails.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:28:06 +0100] "GET /osTicket/scp/emails.php?id=1 HTTP/1.1" 200 19981 "http://192.168.0.60/osTicket/scp/emails.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:28:06 +0100] "GET /osTicket/scp/autocron.php HTTP/1.1" 200 42 "http://192.168.0.60/osTicket/scp/emails.php?id=1" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:28:10 +0100] "GET /osTicket/scp/emails.php?pjax=%23pjax-container HTTP/1.1" 200 7930 "http://192.168.0.60/osTicket/scp/emails.php?id=1" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:28:13 +0100] "GET /osTicket/scp/emailsettings.php?pjax=%23pjax-container HTTP/1.1" 200 10164 "http://192.168.0.60/osTicket/scp/emails.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:28:33 +0100] "POST /osTicket/scp/emailsettings.php HTTP/1.1" 200 16643 "http://192.168.0.60/osTicket/scp/emailsettings.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:28:33 +0100] "GET /osTicket/scp/autocron.php HTTP/1.1" 200 42 "http://192.168.0.60/osTicket/scp/emailsettings.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:28:33 +0100] "GET /osTicket/scp/logo.php?1573201713 HTTP/1.1" 200 8660 "http://192.168.0.60/osTicket/scp/emailsettings.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:28:36 +0100] "GET /osTicket/scp/emails.php HTTP/1.1" 200 14346 "http://192.168.0.60/osTicket/scp/emailsettings.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:28:36 +0100] "GET /osTicket/scp/autocron.php HTTP/1.1" 200 42 "http://192.168.0.60/osTicket/scp/emails.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:28:42 +0100] "POST /osTicket/scp/emails.php HTTP/1.1" 200 13842 "http://192.168.0.60/osTicket/scp/emails.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:28:42 +0100] "GET /osTicket/scp/autocron.php HTTP/1.1" 200 42 "http://192.168.0.60/osTicket/scp/emails.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:28:44 +0100] "GET /osTicket/scp/emails.php?id=1 HTTP/1.1" 200 19981 "http://192.168.0.60/osTicket/scp/emails.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:28:44 +0100] "GET /osTicket/scp/autocron.php HTTP/1.1" 200 42 "http://192.168.0.60/osTicket/scp/emails.php?id=1" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:29:19 +0100] "POST /osTicket/scp/emails.php?id=1 HTTP/1.1" 503 299 "http://192.168.0.60/osTicket/scp/emails.php?id=1" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:31:19 +0100] "GET /osTicket/scp/emails.php?id=1 HTTP/1.1" 200 19981 "http://192.168.0.60/osTicket/scp/emails.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:32:11 +0100] "-" 408 - "-" "-"
192.168.0.56 - - [08/Nov/2019:08:37:32 +0100] "GET /osTicket/scp/logs.php?pjax=%23pjax-container HTTP/1.1" 200 11498 "http://192.168.0.60/osTicket/scp/emails.php?id=1" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:37:33 +0100] "GET /osTicket/scp/emails.php?pjax=%23pjax-container HTTP/1.1" 200 7335 "http://192.168.0.60/osTicket/scp/logs.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:37:34 +0100] "GET /osTicket/scp/emails.php?pjax=%23pjax-container HTTP/1.1" 200 7335 "http://192.168.0.60/osTicket/scp/emails.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:37:36 +0100] "GET /osTicket/scp/settings.php?pjax=%23pjax-container HTTP/1.1" 200 50001 "http://192.168.0.60/osTicket/scp/emails.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:37:39 +0100] "GET /osTicket/scp/emails.php?pjax=%23pjax-container HTTP/1.1" 200 7335 "http://192.168.0.60/osTicket/scp/settings.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:37:40 +0100] "GET /osTicket/scp/emailsettings.php?pjax=%23pjax-container HTTP/1.1" 200 9905 "http://192.168.0.60/osTicket/scp/emails.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:37:48 +0100] "GET /osTicket/scp/ajax.php/help/tips/settings.email HTTP/1.1" 200 4323 "http://192.168.0.60/osTicket/scp/emailsettings.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:40:18 +0100] "GET /osTicket/scp/logs.php?pjax=%23pjax-container HTTP/1.1" 200 11498 "http://192.168.0.60/osTicket/scp/emailsettings.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:08:40:19 +0100] "GET /osTicket/scp/system.php?pjax=%23pjax-container HTTP/1.1" 200 7365 "http://192.168.0.60/osTicket/scp/logs.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:09:00:28 +0100] "GET /osTicket/scp/emails.php?pjax=%23pjax-container HTTP/1.1" 200 7335 "http://192.168.0.60/osTicket/scp/system.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:09:00:34 +0100] "GET /osTicket/scp/emailsettings.php?pjax=%23pjax-container HTTP/1.1" 200 9905 "http://192.168.0.60/osTicket/scp/emails.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:09:00:37 +0100] "GET /osTicket/scp/emails.php?pjax=%23pjax-container HTTP/1.1" 200 7335 "http://192.168.0.60/osTicket/scp/emailsettings.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:09:00:38 +0100] "GET /osTicket/scp/emails.php?id=1&_pjax=%23pjax-container HTTP/1.1" 200 13565 "http://192.168.0.60/osTicket/scp/emails.php" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:09:01:21 +0100] "GET /osTicket/scp/ajax.php/help/tips/emails.email HTTP/1.1" 200 3915 "http://192.168.0.60/osTicket/scp/emails.php?id=1" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:09:02:08 +0100] "POST /osTicket/scp/emails.php?id=1 HTTP/1.1" 503 299 "http://192.168.0.60/osTicket/scp/emails.php?id=1" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"
192.168.0.56 - - [08/Nov/2019:09:03:00 +0100] "-" 408 - "-" "-"

ERROR_LOG
[Fri Nov 08 08:29:19.203898 2019] [proxy_fcgi:error] [pid 7760:tid 139776145483520] [client 192.168.0.56:62202] AH01067: Failed to read FastCGI header, referer: http://192.168.0.60/osTicket/scp/emails.php?id=1
[Fri Nov 08 08:29:19.203947 2019] [proxy_fcgi:error] [pid 7760:tid 139776145483520] (104)Connection reset by peer: [client 192.168.0.56:62202] AH01075: Error dispatching request to : , referer: http://192.168.0.60/osTicket/scp/emails.php?id=1
[Fri Nov 08 09:02:08.630842 2019] [proxy_fcgi:error] [pid 7760:tid 139776120305408] [client 192.168.0.56:62506] AH01067: Failed to read FastCGI header, referer: http://192.168.0.60/osTicket/scp/emails.php?id=1
[Fri Nov 08 09:02:08.634085 2019] [proxy_fcgi:error] [pid 7760:tid 139776120305408] (104)Connection reset by peer: [client 192.168.0.56:62506] AH01075: Error dispatching request to : , referer: http://192.168.0.60/osTicket/scp/emails.php?id=1

CentOS... my first thought is SELinux running?

Sorry I should mention this as well, that is happening even when SeLinux is disabled.

I see this " Connection reset by peer:"
Sounds more like a firewall kicking in .... please check if firewall is running ...

systemctl status firewalld

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