Ubuntu 安装成功，从log 看是IOS(显示服务器无响应)收不到数据，难道被防火墙挡了？

[sunlightxhw]

Feb 17 11:08:44 XS451348357 charon: 10[NET] received packet: from 222.129.25.198[500] to 45.134.85.57[500] (604 bytes)
Feb 17 11:08:44 XS451348357 charon: 10[ENC] parsed IKE_SA_INIT request 0 [ SA KE No N(REDIR_SUP) N(NATD_S_IP) N(NATD_D_IP) N(FRAG_SUP) ]
Feb 17 11:08:44 XS451348357 charon: 10[IKE] 222.129.25.198 is initiating an IKE_SA
Feb 17 11:08:44 XS451348357 charon: 10[IKE] remote host is behind NAT
Feb 17 11:08:44 XS451348357 charon: 10[IKE] sending cert request for "C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3"
Feb 17 11:08:44 XS451348357 charon: 10[ENC] generating IKE_SA_INIT response 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) CERTREQ N(FRAG_SUP) N(MULT_AUTH) ]
Feb 17 11:08:44 XS451348357 charon: 10[NET] sending packet: from 45.134.85.57[500] to 222.129.25.198[500] (473 bytes)
Feb 17 11:09:14 XS451348357 charon: 05[JOB] deleting half open IKE_SA with 222.129.25.198 after timeout
以上IP地址已更改，非实际IP.

[poctopus]

我之前一个主机也遇到过这样的问题，基本就是端口已经被墙了。

[vpsmonitor]

能问一下墙的是 4500端口吗？