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Accessing on-premises servers from O365 app

In some scenario you need the O365 app to interact with your on-premises servers. For examples, you might want to import data from your database server or export data to your REST API. On-premises servers are normally found behind your firewall and are not accessible to external servers, such as the ones used by Ultimate Forms app.

You need to add an exception rule to your firewall to allow external access. The most secure way would be to only allow calls from specific recognized IP addresses.

Listed below are the IP ranges used by our Azure applications that run Ultimate Forms:

  • 13.90.0.0 - 13.90.255.255
  • 13.91.0.0 - 13.91.255.255
  • 23.96.0.0 - 23.96.255.255
  • 40.71.00 - 40.71.255.255
  • 40.78.0.0 - 40.78.255.255
  • 40.85.0.0 - 40.85.255.255
  • 52.232.0.0 - 52.232.255.255
  • 104.40.0.0 - 104.40.255.255
  • 104.45.0.0 - 104.45.255.255
  • 168.62.0.0 - 168.62.255.255
  • 13.81.0.0 - 13.81.255.255
  • 13.69.0.0 - 13.69.255.255
  • 52.174.0.0 - 52.174.255.255

Your server or application must be allowed to accept calls originating from these IP addresses, otherwise your import/export processes will fail.

Note that your connection string must refer to the server by its FQDN (fully qualified domain name) that can be looked up through a public DNS or by its external IP address. Internal IP addresses or internal server names will result in the connection failure. For instance, server=myserver.mycompany.com or server=100.200.100.200 will most likely work, but server=myserver or server=192.168.0.100 will fail.


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Last modified: 7/30/2019 3:59 PM
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