Cannot enable SSH on Google Cloud downloaded centos vmdk on VirtualBox

islammanjurul · 10-24-2020, 10:19 AM

any solution here?

islammanjurul · 10-26-2020, 09:01 AM

Quote:

Originally Posted by Turbocapitalist

The configuration looks normal. Have you changed 'usedns' though?

The log output shows that sshd runs and appears to be listening on all interfaces.

Two more questions while waiting for the strace:

Can you SSH to it from the same machine which it is on using the local host address?

Can you SSH to it from the same machine which it is on using an external address?

using the localhost address, ssh user@localhost gives connection refused on port 2222. Tried /usr/sbin/sshd -ddd , but this time the process is not getting started. bad day... please help.

Not that, I am trying on a different port 2222 other than port 22 for testing purpose, but no luck.

czezz · 11-13-2020, 02:00 AM

Try to install Dropbear SSH and see if that one works in parallel with OpenSSH.
You will need Epel repository.

Code:

sudo yum install epel-release
sudo yum install dropbear

Mind to change port so it does not conflict with any other alrdy in use.

Code:

/etc/default/dropbear
# the TCP port that Dropbear listens on
DROPBEAR_PORT=22

Let us know about results.

islammanjurul · 11-19-2020, 02:22 AM

Quote:

Originally Posted by czezz

Try to install Dropbear SSH and see if that one works in parallel with OpenSSH.
You will need Epel repository.

Code:

sudo yum install epel-release
sudo yum install dropbear

Mind to change port so it does not conflict with any other alrdy in use.

Code:

/etc/default/dropbear
# the TCP port that Dropbear listens on
DROPBEAR_PORT=22

Let us know about results.

Dropbear is working amazingly, no issue so far on doing SSH, but cannot do SFTP, it requires the openssh, any idea how to get sftp work with dropbear? I got some guide but they instructed to compile.

czezz · 11-19-2020, 04:10 AM

You can try to reuse your existing sftp server but keep in mind it belongs to OpenSSH, so in your case it is likely it wont work.
On the Droprear config file, find the section for SFTP and add following one:

Code:

/usr/libexec/openssh/sftp-server

Note: this should be default path for sftp-server on RHEL but I dont have any RHEL here at the moment, so to confirm, execute this:

Code:

find /usr -type f -iname "*sftp-server*"

Note2: if you can use SCP instead of SFTP, then it should work by default with Dropbear.

islammanjurul · 11-19-2020, 04:56 AM

Quote:

Originally Posted by czezz

You can try to reuse your existing sftp server but keep in mind it belongs to OpenSSH, so in your case it is likely it wont work.
On the Droprear config file, find the section for SFTP and add following one:

Code:

/usr/libexec/openssh/sftp-server

Note: this should be default path for sftp-server on RHEL but I dont have any RHEL here at the moment, so to confirm, execute this:

Code:

find /usr -type f -iname "*sftp-server*"

Note2: if you can use SCP instead of SFTP, then it should work by default with Dropbear.

my dropbear config at /etc/default/dropbear was fully blank, I added the port config as per your code, but for SFTP I don't know how to write, but i did the below:

Code:

SFTPSERVER_PATH=/usr/libexec/openssh/sftp-server

I found the sftp-server path there.

Can you provide me a complete dropbear config file which I can use as per my need and other comment out?

And I am getting the following error when doing sftp from my local machine:

Code:

bash: /usr/libexec/sftp-server: No such file or directory
Connection closed

It means my local machine is looking for the sftp on /usr/libexec, but on the actual cloud VM, the sftp location is at /usr/libexec/openssh directory

can I just mv them to the required directory? will it work?

islammanjurul · 11-19-2020, 05:20 AM

Quote:

Originally Posted by islammanjurul

my dropbear config at /etc/default/dropbear was fully blank, I added the port config as per your code, but for SFTP I don't know how to write, but i did the below:

Code:

SFTPSERVER_PATH=/usr/libexec/openssh/sftp-server

I found the sftp-server path there.

Can you provide me a complete dropbear config file which I can use as per my need and other comment out?

And I am getting the following error when doing sftp from my local machine:

Code:

bash: /usr/libexec/sftp-server: No such file or directory
Connection closed

It means my local machine is looking for the sftp on /usr/libexec, but on the actual cloud VM, the sftp location is at /usr/libexec/openssh directory

can I just mv them to the required directory? will it work?

UPDATE:

I copied the sftp-server file from the /usr/libexec/openssh to /usr/libexec and now sftp is working somewhat, still testing if any required.

czezz · 11-19-2020, 08:36 AM

Or you can just link it to: /usr/libexec/sftp-server