Is there a good way using the portal to view the TLS versions in place for an instance of app gateway v2?
You can use the Get-AzApplicationGatewaySslPredefinedPolicy PowerShell cmdlet to get the pre-defined policies that are in use.
More information here:
Configure TLS policy versions and cipher suites on Application Gateway
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How do I see which policies are applied to a given app gateway v2 instance?
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