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CUCM sftp backup to linux fail

Chi Fai Leung


I'm following the guide:
To install the ubuntu 15 as OpenSSH SFTP backup, but it got the fail on it

Error: Unableto access SFTP server. Please ensure the username and password are correct.

I followed all steps as same:

1) Create group for sftp access (optional) for further platform hardening - sudo groupadd sftpuser

2) Create user account for backup sudo adduser cucm_8 sftpuser and make password during user creation dialog

3) Change ownership of home directory sudo chown root.root /home/cucm_8

4) Alter permission for read and write to home directory of backup user sudo chmod 777 /home/cucm_8

5) Install open-ssh server  sudo apt-get install openssh-server

6) Test connectivity to sftp account from FileZilla client (or your preferred supporting secure mode) - transfer and delete file!!!

29 Replies 29

System version:


Please on your linux server give chmod -R 777 home/cucmbackup/

Try again and let me know



Please rate all helpful posts "The more you help the more you learn"

was 777 already... but same error


now I think we have an issue in cipher algorithm configured on linux server and the one supported by CUCM.

Please refer to the following post and check your sshd config.

Also try again the command we previously suggested to transfer files from CUCM through cli and check auth logs on linux server.

Please let let us know 



Please rate all helpful posts "The more you help the more you learn"

Unfortunately, I changed the Linux server as the same subnet of CUCM and it got the same error. Is it the wrong settings on Linux SFTP server?


try command

file list tftp *

or to be more specific

file list tftp Ringlist.xml

for downloading file

file get tftp Ringlist.xml



Hello, same scenario here. I am trying to backup my cucm to a NAS device (synology) and i cannot

my cucm and nas are on different networks but the firewall lets communication. from cucm i can ping nas

I have a synology DS216j as backup.

See my original reply above. The latest synology software has an updated ssh that would cause this problem. You may need to contact synology on how to change the key exchange algorithms if you can't just ssh into it and edit the file.

my synology version is DSM 6.0.2-8451 Update 2

how do i check this thing you are mentioning?

Mark Fisher

Not sure if you ever figured this out but I had the same problem after updating linux. OpenSSH removed a bunch of insecure ciphers which are still used by a good bit of Cisco stuff. With CCUM 10.0 I had to turn those ciphers back on. In my testing the below works.

Edit /etc/ssh/sshd_config and add:

Ciphers +aes128-cbc

KexAlgorithms +diffie-hellman-group1-sha1

Edit /etc/ssh/sshd_config and add:
Ciphers +aes128-cbc
KexAlgorithms +diffie-hellman-group1-sha1

Same scenario, this was the fix for me.


Happened to me after upgrading from 14.04LTS Ubuntu to 16.04LTS.
Had to change the network config to work with ens32 and systemd-networkd:
Had to enable ssh in the iptables - sudo ufw allow ssh
And and finally the above commands here after verifying that I could access the SFTP server with the CUCM credentials via WinSCP, and logging directly into the SFTP server with the CUCM credentials.

Gracias Mark Fisher.

Esto funcionó para mi.
Tengo un CUCM 11.5 y un SFTP SERVER basado el linux Ubuntu 20.04.
Logré configurar el backup device y  un schelude colletion hacia el servidor SFTP.

add this line in to /etc/ssh/sshd_config
Ciphers aes128-cbc,3des-cbc,blowfish-cbc

save and restart service sshd

That could break SSH connections that are dependent on other ciphers. Here is the config snippet I use in sshd_config to allow a server to be an SFTP server for DRS.

KexAlgorithms +diffie-hellman-group1-sha1
KexAlgorithms +diffie-hellman-group-exchange-sha1

Ciphers +aes128-cbc
Ciphers +3des-cbc
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