1、信创Linux客户端ping SBC server是否能ping通

2、客户端日志rapp_session_x.log关键日志：

[INFO][sslvpn.c:1298]:sslvpn_connect - sslvpn_socket_connct to 18.4.253.13 443 ...
[INFO][sslvpn.c:1188]:sslvpn_socket_connct - hostname=18.4.253.13, port=443
[WARN][sslvpn.c:1139]:spice_tcp_select - select timeout, fd 54, type 1, timeout 1000 ms
[ERROR][sslvpn.c:1253]:sslvpn_socket_connct - connect fails ip 18.4.253.13, port 443, spice_tcp_select fail, ret 0
[INFO][sslvpn.c:1278]:sslvpn_socket_connct - connect failed.
[INFO][sslvpn.c:1302]:sslvpn_connect - send proxy header failed..
[INFO][vpn.c:90]:vpn_connect - sslvpn connect failed, error code(-4).

信创客户端通过VDC代理连SBC,用的目标地址是vdc lan口IP，如果vdc lan口IP，或者VDC端口映射到外网，客户端从外网访问，

会出现无法连接问题

1、信创Linux客户端ping SBC server是否能ping通

2、客户端日志rapp_session_x.log关键日志：

[INFO][sslvpn.c:1298]:sslvpn_connect - sslvpn_socket_connct to 18.4.253.13 443 ...
[INFO][sslvpn.c:1188]:sslvpn_socket_connct - hostname=18.4.253.13, port=443
[WARN][sslvpn.c:1139]:spice_tcp_select - select timeout, fd 54, type 1, timeout 1000 ms
[ERROR][sslvpn.c:1253]:sslvpn_socket_connct - connect fails ip 18.4.253.13, port 443, spice_tcp_select fail, ret 0
[INFO][sslvpn.c:1278]:sslvpn_socket_connct - connect failed.
[INFO][sslvpn.c:1302]:sslvpn_connect - send proxy header failed..
[INFO][vpn.c:90]:vpn_connect - sslvpn connect failed, error code(-4).