VScode的SFTP插件无法连接宝塔的 Pure-Ftpd

1. 现象及原因

VScode的SFTP插件，配置好之后，不管上传还是下载，都一直在转圈，无法正常使用。打开插件的debug后得到以下日志：

[07-03 15:40:15] [trace] run command 'Download File'
[07-03 15:40:15] [trace] handle download file for d:\abc.json
[07-03 15:40:15] [debug] > USER abc
[07-03 15:40:15] [debug] < '331 User abc OK. Password required\r\n'
[07-03 15:40:15] [debug] > PASS ******
[07-03 15:40:20] [debug] < '230 OK. Current directory is /\r\n'
[07-03 15:40:20] [debug] > FEAT
[07-03 15:40:20] [debug] > TYPE I
[07-03 15:40:20] [debug] < '200 TYPE is now 8-bit binary\r\n'
[07-03 15:40:20] [debug] > PASV
[07-03 15:40:20] [debug] < '227 Entering Passive Mode (172,11,182,45,154,234)\r\n'
[07-03 15:40:30] [debug] > NOOP
[07-03 15:40:30] [debug] < '200 Zzz...\r\n'
[07-03 15:40:40] [debug] > ABOR
[07-03 15:40:40] [debug] < "226 Since you see this ABOR must've succeeded\r\n"

关键日志是：

[07-03 15:40:20] [debug] > PASV
[07-03 15:40:20] [debug] < '227 Entering Passive Mode (172,11,182,45,154,234)\r\n'

被动模式返回的172.11.182.45是服务器的内网IP，客户端根本就连不上，所以就 ABOR 断掉了。

应该是 Pure-Ftpd 默认获取了内网IP作为被动模式连接用的IP，导致客户端无法通过内网IP连接服务器，所以会连接超时。

有时候等个10多秒，文件又能正常上传，是因为SFTP插件在被动模式连接超时后，会自动切换成主动模式。

2. 解决：手动指定 ForcePassiveIP 的值为公网IP就行