GL-AR300M VPN Connection did not work

I use the GL-AR300M with ExpressVPN. Everything worked perfect till yesterday. Now I can not connect to VPN. The VPN connection works with the ExpressVPN App on the Iphone without any problem. The wireless network of the GL-AR300M also works perfect. I also tried to get a connection with some other VPN Clients, nothing. The router does not connect to VPN. I also did an reset but it didn´t help.

Can somebody help me??

what is displayed on the vpn log?