The Connection settings control how the connection is made to the remote server.
1.Choose Tools | Profiles (Beyond Compare | Profiles on macOS) to open the Profiles dialog.
2.Select a profile on the left pane.
3.Click the Connection page.
4.In Simultaneous connections, specify the maximum number of concurrent connections (from 1 to 10) that Beyond Compare can create to this server.
5.In Read timeout (seconds), specify the timeout for downloading files. The operation will fail if no bytes are received within this time.
6.Select Passive transfers (PASV) if the firewall configuration requires this setting, which modifies the methods used to transfer data back and forth between your computer and the FTP server. Not all FTP servers support PASV mode. If the connection hangs, try turning this on.
7.Select Limit ports used for active transfers (PORT) and specify a range of ports that the FTP server will connect to when uploading/downloading files using active transfers (The Passive transfers checkbox is cleared). Use this if you need to configure your firewall to allow incoming connections.
8.Select Use HOST before login to control whether the HOST command should be sent before sending the username and password to log in. This is required to connect to some virtual FTP hosts. Clear the checkbox if the connection is being dropped before the username is sent.
9.Select Clear control channel (SSL only) to send control channel communication unencrypted after sending encrypted login detail. Try turning this on if the initial SSL connection succeeds but file transfers or directory listings hang. 
10.Select Clear data channel (SSL only) to send file content and directory listings unencrypted. This can provide a speedup when transferring lots of files after sending encrypted login details.
11.Select Limit TLS/SSL versions to specify the range of TLS/SSL versions that can be used to connect to an encrypted FTPS server. By default, Beyond Compare will try a range of versions, including the newest, and automatically fall back to older versions if the default does not work. This setting allows disabling that behavior, either to restrict the connection to newer, more secure versions of TLS, or to work around issues with the TLS/SSL encryption handshake. If the initial connection succeeds but disconnects after sending the AUTH TLS, AUTH SSL, or USER commands, try decreasing the Max value.
Note If you need help with the settings on this page, consult your system administrator.
