badmotorfinger

Yes, that's correct. The ESET Push Notification server is having intermittent issues and repair is underway.

You wrote that you had Endpoint configured to connect through http proxy.
Please refer to the Troubleshooting section at https://help.eset.com/protect_deploy_va/90/en-US/enable_apache_http_proxy.html:
If you get the EPNS service servers are not accessible Web Console error, follow these steps to disable the connection timeout limits:
1.Create a configuration file reqtimeout.conf:
sudo touch /etc/httpd/conf.d/reqtimeout.conf
2.Open the file in a text editor:
nano /etc/httpd/conf.d/reqtimeout.conf
3.Type this setting into the file:
RequestReadTimeout header=0 body=0
4.Save the changes a close the file:
CTRL+X > type Y > press Enter
5.Open the httpd.conf file:
nano /etc/httpd/conf/httpd.conf
6.Add the following line at the end:
IncludeOptional conf.d/reqtimeout.conf
7.Save the changes a close the file:
CTRL+X > type Y > press Enter
8.Restart the Apache HTTP Proxy service:
systemctl restart httpd
 

Then re-configure Apache http proxy as follows:
1, Either disable the module reqtimeout_module
2, Or disable limits, ie. by creating a new file reqtimeout.conf in /etc/httpd/conf.d/ and setting "RequestReadTimeout header=0 body=0". Include the file in the configuration, ie. add "IncludeOptional conf.d/reqtimeout.conf" to /etc/httpd/conf/httpd.conf.