A recent software update for Fortinet firewalls (external link) forces deep packet inspection on port 22 causing offsite synchronization failure.
- Datto SIRIS
- Datto ALTO
- Datto NAS
- Fortinet Firewall
Set a rule to allow port 22 through the firewall without packet inspection, or exclude *.datto.com and *.dattobackup.com from deep packet inspection. Contact Fortinet for information on how to make these changes on your specific firewall.
- Fortinet firewalls (external link)