Archer C2300 - Intermittent FTP Connection Problems over TLS
iMac 27" late 2013 | Intel i7 3.5GHz | 8GB RAM | MacOS 10.14.3
FileZilla 3.4.11 | Transmit 3.7
I have an intermittent issue uploading files via FTP using TLS. Specifically, it happens when I try to upload folders containing many files and sub-folders such as WordPress core or theme files. The error on FileZilla tranfer log shows something like this:
tatus: Resolving address of ds.6274.co.uk
Status: Connecting to 217.78.1.89:21...
Response: 200 Type set to I
Command: PASV
Response: 227 Entering Passive Mode (217,78,1,89,198,10).
Command: MLSD
Error: Connection timed out after 20 seconds of inactivity
Error: Could not connect to server
Status: Disconnected from server
Status: Delaying connection for 5 seconds due to previously failed connection attempt...
Error: Connection timed out after 20 seconds of inactivity
Error: Could not connect to server
Status: Disconnected from server
Status: Delaying connection for 5 seconds due to previously failed connection attempt...
Error: Connection timed out after 20 seconds of inactivity
Error: File transfer failed
Error: Connection timed out after 20 seconds of inactivity
Error: Could not connect to server
Status: Disconnected from server
Status: Disconnected from server
Large, single files are not a problem, it's when there are lots of small files that the problem occurs.
I say intermittent because there is no pattern to which server it happens on or how many files will transfer successfully before the error occurs. Technical support for several servers I use say the problem must be at my end i.e. with my router / firewall, etc so I'm hoping someone here can help. I have also tried connecting to the server using the hotspot on my phone (and mobile data) and the problem goes away.
By the way, how is my router model not in the drop-down list when you create a message thread? That's very surprising!