UPGRADE_MESSAGE="$UPGRADE_MESSAGE\nWe've noticed that you're using a invalid hostname. Please have a look at the RFC1178 standard (https://datatracker.ietf.org/doc/html/rfc1178) and use a valid one (ex. hostname.domain.tld). You can change the hostname using v-change-sys-hostname and also add a ssl certificate using v-add-letsencypt-host (proper dns A record mandatory). You'll find more informations in our documentation: https://docs.hestiacp.com/admin_docs/web/ssl_certificates.html#how-to-setup-let-s-encrypt-for-the-control-panel"
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