Proxy Error during Site update

Problem

During a site update on Checkmk Appliance you may run into a Proxy error from apache.

Solution

In case you run into this error the update fails. To get the webconf working, you need to follow the following steps:

Check the update.log on the Checkmk Appliance
```
root@cma:/mnt/auto# cat /omd/sites/test/var/log/update.log
```
1. You will notice that the update.log is hanging and full of errors
You need to solve all the problems
Now you need to run the update config command again to update the whole config
```
OMD[test]:~$ cmk-update-config -vv
```
Start the Site. The webconf should work again
1. If the webconf is not working, try to restart the apache and webconf daemon
```
systemctl status webconfd
systemctl status apache2.service
```