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ExternalClientAuthenticationMethod vs InternalClientAuthenticationMethod

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Hi All, 

I was hoping to get some information around which of these values are applied by the client for outlook anywhere connections: 

ExternalClientAuthenticationMethod or InternalClientAuthenticationMethod

We have tested externally and found that NTLM works for mail but fails when trying to auth the directory connection in outlook. So we would like to have external set to basic (Works without issues) and internal to NTLM (Fine within the network) 

Our HLB is F5 and with the source addresses coming from the SNAT local IP I was wondering if the external Auth value will do anything? 

Do we know how client works out whether they are internal or external and which auth setting is used? 

Thanks

Joshua Bines




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