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gmonte
Staff
gmonte
Staff
March 27, 2026

Troubleshooting Tip: Blank page showed when users trying to authenticate WLAN through Azure

  • March 27, 2026
  • 0 replies
  • 316 views
Description

This article describes a scenario where users are trying to access the local network through the WiFi and using the Azure SAML authentication, but face an error that shows a blank page. This error can be due to redirections that occur in the background and need to be explicitly allowed.
Scope FortiGate.
Solution

In this case, to allow the authentication to be successful, add the following exemptions (as the destination) on the policy created for the exemptions as follows:

 

edit 3
    set name "FQDN"
    set srcintf "portX"
    set dstintf "portY"
    set action accept
    set srcaddr "all"
    set dstaddr "login.microsoftonline.com" "login.microsoft.com" "login.windows.net" "office.com" "Microsoft" "YOUR_PORTAL_URL" "msauth.net" "msfauth.net" "aadcdn.msauth.net" "aadcdn.msftauth.net" "fac.corp.fortinet.com"
    set schedule "always"
    set service "ALL"
    set logtraffic all
    set nat enable
    set captive-portal-exempt enable
next

 

After, add the same exemption FQDNs listed in the policy above under the related SSID setting.
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