最近我已经迁移了一个centOS 5服务器到7.但是从那时起通过FileZilla连接到FTP不起作用，除非我把FileZilla放在FTP Plain Connection上。
获取文件夹列表时TLS不起作用正常login。 但是之后呢超时了。
2016-04-10 11:29:59 3348 1 Status: Resolving address of something.com 2016-04-10 11:29:59 3348 1 Status: Connecting to xxxx:21... 2016-04-10 11:29:59 3348 1 Status: Connection established, waiting for welcome message... 2016-04-10 11:29:59 3348 1 Response: 220 ProFTPD 1.3.5b Server ready. 2016-04-10 11:29:59 3348 1 Command: AUTH TLS 2016-04-10 11:29:59 3348 1 Response: 234 AUTH TLS successful 2016-04-10 11:29:59 3348 1 Status: Initializing TLS... 2016-04-10 11:29:59 3348 1 Status: Verifying certificate... 2016-04-10 11:29:59 3348 1 Status: TLS connection established. 2016-04-10 11:29:59 3348 1 Command: USER xxxxx 2016-04-10 11:29:59 3348 1 Response: 331 Password required for xxxxx 2016-04-10 11:29:59 3348 1 Command: PASS *********** 2016-04-10 11:29:59 3348 1 Response: 230 User xxxxx logged in 2016-04-10 11:29:59 3348 1 Command: OPTS UTF8 ON 2016-04-10 11:29:59 3348 1 Response: 200 UTF8 set to on 2016-04-10 11:29:59 3348 1 Command: PBSZ 0 2016-04-10 11:29:59 3348 1 Response: 200 PBSZ 0 successful 2016-04-10 11:29:59 3348 1 Command: PROT P 2016-04-10 11:29:59 3348 1 Response: 200 Protection set to Private 2016-04-10 11:29:59 3348 1 Status: Logged in 2016-04-10 11:29:59 3348 1 Status: Retrieving directory listing... 2016-04-10 11:29:59 3348 1 Command: PWD 2016-04-10 11:29:59 3348 1 Response: 257 "/" is the current directory 2016-04-10 11:29:59 3348 1 Command: TYPE I 2016-04-10 11:29:59 3348 1 Response: 200 Type set to I 2016-04-10 11:29:59 3348 1 Command: PASV 2016-04-10 11:29:59 3348 1 Response: 227 Entering Passive Mode (x,x,x,x,137,183). 2016-04-10 11:29:59 3348 1 Command: LIST 2016-04-10 11:30:19 3348 1 Error: Connection timed out after 20 seconds of inactivity 2016-04-10 11:30:19 3348 1 Error: Failed to retrieve directory listing 2016-04-10 11:31:41 3348 1 Status: Disconnected from server 到目前为止，我唯一能够find的就是将其添加到proftpd.conf中
<IfModule mod_facts.c> FactsAdvertise off </IfModule>
这将命令更改为LIST而不是MLSD。 然而，它仍然没有理由超时。 有人有什么主意吗？
编辑：没有TLS的连接工作正常
2016-04-10 11:21:28 8704 1 Status: Resolving address of something.com 2016-04-10 11:21:28 8704 1 Status: Connecting to xxxx:21... 2016-04-10 11:21:28 8704 1 Status: Connection established, waiting for welcome message... 2016-04-10 11:21:28 8704 1 Response: 220 ProFTPD 1.3.5b Server ready. 2016-04-10 11:21:28 8704 1 Command: USER xxxxx 2016-04-10 11:21:28 8704 1 Response: 331 Password required for xxxxx 2016-04-10 11:21:28 8704 1 Command: PASS *********** 2016-04-10 11:21:28 8704 1 Response: 230 User xxxxxlogged in 2016-04-10 11:21:28 8704 1 Command: SYST 2016-04-10 11:21:28 8704 1 Response: 215 UNIX Type: L8 2016-04-10 11:21:28 8704 1 Command: FEAT 2016-04-10 11:21:28 8704 1 Response: 211-Features: 2016-04-10 11:21:28 8704 1 Response: LANG en-US* 2016-04-10 11:21:28 8704 1 Response: EPRT 2016-04-10 11:21:28 8704 1 Response: EPSV 2016-04-10 11:21:28 8704 1 Response: MDTM 2016-04-10 11:21:28 8704 1 Response: SSCN 2016-04-10 11:21:28 8704 1 Response: SIZE 2016-04-10 11:21:28 8704 1 Response: PROT 2016-04-10 11:21:28 8704 1 Response: CCC 2016-04-10 11:21:28 8704 1 Response: PBSZ 2016-04-10 11:21:28 8704 1 Response: AUTH TLS 2016-04-10 11:21:28 8704 1 Response: REST STREAM 2016-04-10 11:21:28 8704 1 Response: UTF8 2016-04-10 11:21:28 8704 1 Response: 211 End 2016-04-10 11:21:28 8704 1 Command: OPTS UTF8 ON 2016-04-10 11:21:28 8704 1 Response: 200 UTF8 set to on 2016-04-10 11:21:28 8704 1 Status: Logged in 2016-04-10 11:21:28 8704 1 Status: Retrieving directory listing... 2016-04-10 11:21:28 8704 1 Command: PWD 2016-04-10 11:21:28 8704 1 Response: 257 "/" is the current directory 2016-04-10 11:21:28 8704 1 Command: TYPE I 2016-04-10 11:21:28 8704 1 Response: 200 Type set to I 2016-04-10 11:21:28 8704 1 Command: PASV 2016-04-10 11:21:29 8704 1 Response: 227 Entering Passive Mode (x,x,x,x,139,173). 2016-04-10 11:21:29 8704 1 Command: LIST 2016-04-10 11:21:29 8704 1 Response: 150 Opening BINARY mode data connection for file list 2016-04-10 11:21:29 8704 1 Response: 226 Transfer complete 2016-04-10 11:21:29 8704 1 Status: Directory listing of "/" successful
看到：
ProFTPD – 在使用TLS时无法检索目录列表
这可能是你和服务器之间的防火墙的相关规则的问题。