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Hi all,
I'm facing issues to configure VPN on my TL-ER6020. I've configure it correctly (I hope).

Port 500 - 1701 - 4500 UDP are open, but when a client try to connect it gave me the screen attached on administration page.

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And on client the error is: "Can't connect The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer."

Could someone help me on this?

Thanks in advance,