奇怪的断线问题

[SarinV]

电信200M家庭宽带，直连光猫拨号连接稳定，但是中间如果隔着路由器的话就会连上就断线，概率能连上，连上至断线的间隙大概十多秒，这十多秒时间内VPN可以工作可以访问谷歌，随后断线。
请问这种情况应该怎么解决？
日志：
16:06:47 Contacting xxxx.xxxx.xx:0001.
16:06:48 User credentials entered.
16:06:52 User credentials entered.
16:06:52 Establishing VPN session...
16:06:52 The AnyConnect Downloader is performing update checks...
16:06:52 Checking for profile updates...
16:06:52 Checking for product updates...
16:06:52 Checking for customization updates...
16:06:53 Performing any required updates...
16:06:53 The AnyConnect Downloader updates have been completed.
16:06:53 Establishing VPN session...
16:06:53 Establishing VPN - Initiating connection...
16:06:53 Establishing VPN - Examining system...
16:06:53 Establishing VPN - Activating VPN adapter...
16:06:53 Establishing VPN - Configuring system...
16:06:55 Establishing VPN...
16:06:55 Connected to xxxx.xxxx.xx:0001
16:07:02 Reconnecting to xxxx.xxxx.xx:0001...
16:07:03 Disconnect in progress, please wait...
16:07:03 The secure gateway has rejected the connection attempt. A new connection attempt to the same or another secure gateway is needed, which requires re-authentication.

[SarinV]

已解决，路由器防火墙设置问题，原因未知，重写防火墙规则后问题不再出现。

[SarinV]

更新故障原因与解决方案

最终发现是客户端版本过低的原因，更新至最新客户端后问题解决。