Thank you sooooooooooooooooo much for the resolution. It works perfectly now!!!!

It was found out in GreenBow phrase 2 is ES128 Encryption while in the router is 3DESunder IPsec proposal. I have change to the same one. But the “P1 Algorithm Mismatch on the client side”never...

Here are the combinations of the Fiber Module Card. You can choose any pair of them. 　　Choice 1,*TL-SM321B+TL-SM321A 　　Choice 2,*TL-SM311LS+TL-SM311LS 　　Choice 3,*TL-SM311LM+TL-SM311LM

I have checked for several times, and am sure the settings are match there. One more update information: I found the message said in the router log. Hope it helps to figure out the problem.

Region : Argentina Model : TL-ER6120 Hardware Version : V1 Firmware Version : ISP : Recently got the TL-ER6120, want to set it up as Client-To-Site VPN by using the application GreenBow. the settings...