Hi,
I'v tested again and this config is OK for proxying proxmox (including vnc):
<VirtualHost *:443>
ServerName <Extern.Sitename.de>
ErrorLog ${APACHE_LOG_DIR}/Proxy_<Extern.Sitename.de>_error.log
CustomLog ${APACHE_LOG_DIR}/Proxy_<Extern.Sitename.de>_access.log combined
UseCanonicalPhysicalPort Off
UseCanonicalName Off
DocumentRoot /var/www/html/
SSLEngine on
SSLCertificateFile
/etc/letsencrypt/live/<Extern.Sitename.de>/fullchain.pem
SSLCertificateKeyFile /etc/letsencrypt/live/<Extern.Sitename.de>/privkey.pem
ProxyRequests Off
ProxyPreserveHost On
#SSL Connect
SSLProxyVerify none
SSLProxyCheckPeerCN off
SSLProxyCheckPeerName off
SSLProxyCheckPeerExpire off
# HSTS (mod_headers is required) (15768000 seconds = 6 months)
#Header always set Strict-Transport-Security "max-age=15768000"
# Encoded slashes need to be allowed
AllowEncodedSlashes NoDecode
RewriteEngine on
RewriteCond %{HTTP:Connection <HTTP:Connection> } Upgrade [NC]
RewriteCond %{HTTP:Upgrade <HTTP:Upgrade> } websocket [NC]
RewriteRule /(.*) wss://127.0.0.1:8006/$1 [P,L]
SSLProxyEngine on
ProxyRequests off
#block Proxy for letsencrypt verification!
ProxyPass /.wellknown !
ProxyPass / https://127.0.0.1:8006/ flushpackets=On
connectiontimeout=300 timeout=300
ProxyPassReverse / https://127.0.0.1:8006/
ProxyTimeout 600
</VirtualHost>
