svn外网访登录不进去提示证书错误Authorization Required

为了外网能访问内网svn。于是坐在外网端口映射。但是奇怪的是内网能访问，外网总也登录不进去。以为是浏览器版本低

但是其他浏览器也一样。最后客户端也登录不进去。提示报错：

Authorization Required
This server could not verify that you are authorized to access the document requested. Either you supplied the wrong
credentials (e.g., bad password), or your browser doesn't understand how to supply the credentials required.
网上搜索解决方案无果，怀疑外网防火墙或映射时做了安全过滤。但是tcp和utp都已经设置了。
最终发现...端口竟然被公司内网其他端口给占用了。原来外网端口可以映射内网多个端口竟然不剖异常...
最后新开端口并做了映射...问题也迎刃而解了....