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I have an issue when I'm trying to connect to a SFTP-server using FileZilla. I'm sure that the server is up and running, but I just get:

Error: Server unexpectedly closed network connection 
Error: Could not connect to server

enter image description here

I'm trying to connect to a server by using sftp://WhateverLinkToServer.com and the port is 22015, tried to open the port in the firewall with no luck. I'm positive that the username and password is correct.

Is there any method to debug this, a log-file or something to show if I'm missing anything, or do you have any other suggestions of how to solve my problem?

Update: I was able to connect via the terminal directly to the SFTP-server. Any suggestion on what the problem is with my FileZilla? Is there something wrong with my key fingerprint?


Cheers,
Magnus

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  • Just wondering.. you have installed openssh server and allowed logins ? (sudo apt-get install openssh-server)
    – Aravinda
    May 4, 2015 at 12:28
  • Yes, openssh server is already installed.
    – magnusnn
    May 4, 2015 at 12:36
  • just check your port is opened for outer world. pentest-tools.com/discovery-probing/… if it is not showing, it should be a firewall or portforwarding issue if it is behind a nat gateway...
    – Aravinda
    May 4, 2015 at 12:48
  • I doubt it because the person next to me (a mac user and on the same network) was able to connect with no problem, but I'll give it a try on another network where I know the port should not be a problem
    – magnusnn
    May 4, 2015 at 12:58
  • I think there is a real issue here, something which occurs with (certain versions of) Filezilla and particular server config or software versions, i.e. it's not a problem with firewalls, port forwarding etc.. I can consistently reproduce it With Debian8+mysecureshell and Filezilla 3.7.3-1ubuntu1 (the version in the 14.04 repositories).
    – arjan
    Feb 1, 2016 at 17:53

3 Answers 3

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Well, this is embarrassing... The whole time I was using an older version of FileZilla (3.7.3) installed via apt-get and could not get this one to work. After downloading the newest version (3.10.3) it worked like a charm. Thanks for your help tho!

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  • Thanks, this worked for me too. But I only had this problem with a Debian 8 server, the old Filezilla 3.7.3-1ubuntu1 version worked fine with e.g. Debian 7 (and serverside mysecureshell in both cases).
    – arjan
    Feb 1, 2016 at 17:57
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Server added your IP address to deny list due to repetitive connection failed attempts. Provide your IP address to SFTP server administrator and inform him to remove your IP address entry from "/etc/hosts.deny" file.

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  • I'll try to come in touch with him.
    – magnusnn
    May 4, 2015 at 13:00
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I think this maybe a problem with your forwarding. Please check if your Network and Firewall has this Port open and forwarded. If you like to share a screenshot it would be much appreciated. Thanks :)

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6
  • Well I'm on a school network and can't check if the port forward-settings on the router, but the person next to me (a mac-user) was able to connect to the same server using FileZilla. Here is a screenshot of FileZilla: Screenshot
    – magnusnn
    May 4, 2015 at 12:52
  • Best thing is to contact sftp server administrator.. Otherwise it would be a wastage of time.. Who knows what type of rules applied server level and what is the network infracture etc..
    – Aravinda
    May 4, 2015 at 12:58
  • Alright, thanks for your answer tho, I'll contact him asap.
    – magnusnn
    May 4, 2015 at 13:05
  • I so your last edit now.. can you telnet 22015 ? tellnet whateverLinkToServer.com 22015
    – Aravinda
    May 4, 2015 at 13:31
  • @Aravinda Yes, telnet works.
    – magnusnn
    May 4, 2015 at 13:33

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