Deluge can't connect to remote seedbox on Ubuntu 16.04 LTS

[piktor]

I have successfully installed Ubuntu 16.04 LTS and Deluge 1.3.13 (from deluge-team PPA) but I can't connect to my remote seedbox.

I'm able to ping remote hostname. I can telnet remote hostname and port.

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$ telnet remote.dom 12345
Trying 12.34.56.7...
Connected to remote.dom.

I can connect using deluge-console with no error. I think that means successfully connected.

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$ deluge-console "connect remote.dom:12345 username password"

When I open Deluge's Connection Manager, status with the remote seedbox is marked with cross and I can't connect.

I have tried Deluge on my Windows 7 virtual machine (VirtualBox is installed on the same computer as above) and everything is working fine. I guess the problem is maybe in some missing service/component on my Ubuntu. What do you think? Thanks.

[piktor]

I have looked to the Deluge log but found no error, only:

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[INFO    ] 20:42:54 client:217 Connecting to daemon at remote.dom:12345..
[INFO    ] 20:42:54 client:121 Connected to daemon at 12.34.56.7:12345..
[INFO    ] 20:42:54 client:224 Connection lost to daemon at remote.dom:12345 reason: Connection was closed cleanly.

I have asked the provider of my torrent server and they told me they are using Deluge 1.3.6. Is the older version the problem?

http://forum.deluge-torrent.org/viewtop ... =7&t=54096

I have found this topic and the recommendation is to upgrade the server. Do you think this will really help?