Problem in FTP Retrieving directory listing

I am trying to connect via Filzilla to FTP but I have the following problem:

Status: Retrieving directory listing…
Command: PWD
Response: 257 / is the current directory
Command: TYPE I
Response: 200 Type set to I
Command: PASV
Response: 227 Entering Passive Mode (129,114,60,56,119,158).
Command: MLSD
Response: 150 Opening BINARY mode data connection for MLSD
Error: Connection timed out after 20 seconds of inactivity
Error: Failed to retrieve directory listing

Many thanks in advance.