Lync 2013 web app login prompt

Hi.
I have some trouble with Lync 2013 web app. When the page is loaded, it always prompt for credentials.
I understand, that from LAN it try to use user credentials, but from the external it is problematic.
We use TMG as reverse proxy. Is there any way, how to remove prompt for external sites ?
Thanks

The login dialog is by design, you can’t remove the prompt.
As most external users can access successfully, I think the problem is on the client side.
Please check the supported platforms for Lync Web App at
http://technet.microsoft.com/en-us/library/gg425820.aspx
Please check if the issue always happens to the problem Lync account.
Check if the issue happens to multiple Lync account on the same computer.
Check if the issue happens to the same Lync account on another computer.
Lisa Zheng
TechNet Community Support

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