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Issue POST 503 Error

Retr0

New Pleskian
I use a Woltlab CMS on my Plesk Server all works perfekt but now i have install n Plugin that use Websocket. I got every time a Connection Refused error in the Website Error Log.

Unable to connect to server. (error code: 111) message: Connection refused

i look at plesk and they tell me
200GET /index.php?team-speak-id-add/ HTTP/1.0
503POST /index.php?team-speak-id-add/ HTTP/1.0

Plesk Web Application Firewall:
2021-03-13 22:04:41Access84.136.*.*GET /index.php?team-speak-id-add/ HTTP/1.0
2021-03-13 22:04:54Error84.136.*.*POST /index.php?team-speak-id-add/ HTTP/1.0
2021-03-13 22:04:56Access84.136.*.*GET /index.php?team-speak-id-add/ HTTP/1.0
2021-03-13 22:05:03Error84.136.*.*POST /index.php?team-speak-id-add/ HTTP/1.0
2021-03-13 22:05:04Access84.136.*.*GET /index.php?team-speak-id-add/ HTTP/1.0

what can i do to fix this problem ?
 
be sure that your IP isn't on the block list maybe caused through outlook wrong email password.

check the fail2ban blocked IP's

maybe you had to disable the webfirewall.

Unable to connect to server. (error code: 111) message: Connection refused
 
Damm even I am having a similar kind of issue, I have searched all over the internet and even have posted on number of threads on different forum, no solution seems to work. I am really frustrated, can anyone of you here help me resolve this issue, I am very much tired now.
vidmate insta save
 
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