SIRIS, ALTO, and NAS: Offsite synchronization fails after Fortinet firewall update



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 * and * from deep packet inspection. Contact Fortinet for information on how to make these changes on your specific firewall.

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