In other cases their FTP server is limited to a single connection, so if you have FileZilla/Cyberduck/Transmit open you can’t also connect with Sparkle at the same time. Conflict detection How about if you modified a same file in both Mac and remote computer Most software can NOT handle this, they simply overwrite.
Handle different time zone Synchronize files correctly even if the time zone between Mac and FTP server is different. When the protocol is set in “autodetect” mode, Sparkle will connect to port 22 first (sftp) and 990 and 21 next (ftp implicit/explicit tls, plain ftp), and this in some cases triggers a “port scan” detection, so they will block your IP address. Uploading/downloading multiple files with different servers at the same time.
While web host support will tell you everything is working, they often are not really interested in troubleshooting and solving the more obscure issues (low margin business, etc), and they usually don’t have visibility into the security features of their network. Some ISPs will block FTP port 21 by default, if they do you need to ask them to unblock it. While you don’t typically think of anything going wrong between your Mac and some place on the internet, the FTP protocol has been recently abused by malware, and is targeted by network filters in general. Others are Little Snitch, and antivirus software. Your Mac can have network blocking software installed, for example TripMode is a popular app to reduce network usage when on tethered connections, and by default it blocks all apps on your Mac from connecting to the network. This can be tricky to diagnose, Sparkle is legitimately unable to connect to that FTP server, so there’s a networking issue somewhere.
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