FTP Troubleshooting Information
Why is my FTP not logging in?
This largely depends on the response of the FTP server. Here are some of the common errors and how to fix it.
Response: - 530 Non-anonymous sessions must use encryption
Plain FTP is not supported at Ultra.cc. You must connect over the following:
- Explicit TLS over port 21
- Explicit Auth SSL over port 21
- SFTP/SSH2 protocol over port 22
Response: [SFTP] Status: Access denied or [FTP] Response: 530 Login incorrect
This usually means your password is either.
- not set or;
- is no longer valid in your UCP's access details due to technical issues or announcements.
Response: ERRCONN REFUSED or Connection Refused
The server’s Fail2Ban has been triggered due to too many invalid authentication attempts in a period. It restricts your IP address from logging in until that period is expired.
You will need to wait 10-15 minutes before trying again. Any further attempts will reset the timer.
Response: Algorithm negotiation failed
As our servers are upgraded to Debian 11, it no longer supports OpenSSL 1.1.1 which certain FTP clients still uses. For example, if you are using Davos, you will encounter this error when trying to connect via FTP to one of our Debian 11 servers.
FXP is not working
FXP support can make an FTP server vulnerable to an exploit known as FTP bounce. As a result of this, our FTP servers have it disabled.
How to resolve slow download speed issues?
A common issue that can affect you if you have a Windows 10 PC, the Receive Window Auto-Tuning Level setting in netsh is set improperly. Windows usually reset this during OS upgrades. This can affect a number of things such as FTP, VPN or single connection applications
Try running netsh interface tcp show global using Command Prompt or PowerShell running in Administrator mode. You should see the following settings.
PS C:\\Windows\\system32> netsh interface tcp show global
Querying active state...
TCP Global Parameters
----------------------------------------------
Receive-Side Scaling State : enabled
Receive Window Auto-Tuning Level : normal
Add-On Congestion Control Provider : default
ECN Capability : disabled
RFC 1323 Timestamps : disabled
Initial RTO : 1000
Receive Segment Coalescing State : enabled
Non Sack Rtt Resiliency : disabled
Max SYN Retransmissions : 4
Fast Open : enabled
Fast Open Fallback : enabled
HyStart : enabled
Proportional Rate Reduction : enabled
Pacing Profile : offReceive Window Auto-Tuning Level should be set to normal, but some clients have better results by switching from normal to experimental. To do that, run the following command:
netsh int tcp set global autotuninglevel=experimentalThe experimental option can give you full download speeds. Please make sure that you do a reboot before testing.
To go back to the default, run the following command:
netsh int tcp set global autotuninglevel=normalAnother cause of this is the use of VPNs. There are chances that the VPN is throttling your speeds, so make sure you disable your VPN connection whenever you download your files from your slot.
Another possible reason is that your disk has very high IO utilization. To check, run this command in your shell and pay attention to the last column named %util.
iostat -xk 2 $(findmnt -T ~ | awk 'END {print $2}')If this is 100%, the disk you’re in is entirely saturated, affecting your apps’ performance. You may need to send a ticket to our support system so the Ultra.cc team can investigate.
I need plain FTP. Is there any way to use it?
Plain FTP is not supported on our slots due to our commitments to security and privacy for our clients.
However, should you really need plain FTP and you fully know the risks, you may install userland ProFTPD in your userspace. Please check the following guide for the installation of Userland ProFTPD.
- Then, once you finished installing and setting up ProFTPD, you will need to edit
~/.config/proftpd/proftpd.confand set TLSRequired tooffinsteaf ofonusing a text editor. - After that, run
systemctl --user restart proftpdto reflect the changes in Userland ProFTPD. - Logging in with the username/password combo you created during the installation will now be unencrypted.
Why does the FTP connection keep disconnecting with Error: “Disconnect after 20 seconds of inactivity”?
Most FTP clients create new threads when transferring files. All this means is that your original connection has timed out for being idle for too long.
If you're having latency issues, then it's likely you will also experience this error too.
Some of my files have duplicates in ~/files or ~/Downloads directory and ~/media directory. Are they using double disk space?
If you're using Radarr/Sonarr/Sickchill/CouchPotato/Medusa etc., they should not be taking any additional space. By default, these applications create a hardlink of the file to the default root directory of your application.
A hard link can be described as a single file located at two different paths but pointing at the same block of data on the disk. Think of it as two signposts from other streets that direct you to the same destination.
Hardlinks do not take any extra space. You can compare the inode numbers for both files from the Terminal (SSH Access) with ls -I. The inode number will be the same.
You can read more about Hard Links here: https://en.wikipedia.org/wiki/Hardlink.
If you require further assistance, you can open a support ticket here!
Feedback and suggestions regarding this article are welcome on our Discord server
- FTP Troubleshooting Information
- Why is my FTP not logging in?
- Response: - 530 Non-anonymous sessions must use encryption
- Response: [SFTP] Status: Access denied or [FTP] Response: 530 Login incorrect
- Response: ERRCONN REFUSED or Connection Refused
- Response: Algorithm negotiation failed
- FXP is not working
- How to resolve slow download speed issues?
- I need plain FTP. Is there any way to use it?
- Why does the FTP connection keep disconnecting with Error: “Disconnect after 20 seconds of inactivity”?
- Some of my files have duplicates in ~/files or ~/Downloads directory and ~/media directory. Are they using double disk space?