Web Notifications error

Dear all,

I’ve used for a while the web notification system. It worked fine until recently.

Now, I now see only 503 erros in my Apache logs :

[root@miq-prod apache]# grep notification ssl_access.log|head
x.x.x.x - - [01/Apr/2021:03:20:19 +0200] "GET /ws/notifications HTTP/1.1" 503 299
x.x.x.x - - [01/Apr/2021:03:20:26 +0200] "GET /ws/notifications HTTP/1.1" 503 299
x.x.x.x - - [01/Apr/2021:03:21:19 +0200] "GET /ws/notifications HTTP/1.1" 503 299

When I logout/login, the notifications appears in the notification lists.

Do you have any ideas how to diagnostics that ?

Is there a way to purge all the notifications for all the users ?

Thanks a lot !