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Hi Stephan,
Thanks for the information. Issue is fixed and it was IBM ssh service which was blocking way for cygwin to bind address 0.0.0.0/22 on my windows machine. I disabled that service and cygwin worked smoothly.
--
Thanks,
Subbu Wednesday, 19 August 2020, 10:03PM +05:30 from Stephen Carrier  carrier AT berkeley DOT edu :

>On Sun, Aug 16, 2020 at 11:36:10AM +0200, Marco Atzeri via Cygwin wrote:
> On 16.08.2020 10:17, Subramanya Narayanaswamy via Cygwin wrote:
>> Hi Team,
>>
>> I'm facing below issue while trying to start CYGSSHD server. I'm running the below command as an Administrator but not sure why cygsshd is not starting. Any help?
>> --------------------------------------------------------------
>> $ net start cygsshd
>> The CYGWIN cygsshd service is starting.
>> The CYGWIN cygsshd service could not be started.
>>
>> The service did not report an error.
>>
>> More help is available by typing NET HELPMSG 3534.
>>
>> Subramanya
>>
>
> I saw the same problem.
> The /var/log/sshd.log gave me the hint:
> -----------------------------------------------
> Permissions 0640 for '/etc/ssh_host_rsa_key' are too open.
> It is required that your private key files are NOT accessible by others.
> This private key will be ignored.
> ..
> Permissions 0640 for '/etc/ssh_host_ecdsa_key' are too open.
> It is required that your private key files are NOT accessible by others.
> This private key will be ignored.
> ..
> Permissions 0640 for '/etc/ssh_host_ed25519_key' are too open.
> It is required that your private key files are NOT accessible by others.
> This private key will be ignored.
> sshd: no hostkeys available -- exiting.
> ------------------------------------------------
>/var/log/sshd.config may provide helpful clues even if the issue is
>different from loose permissions on the private keys.  Let us know what
>you find there if you are still having trouble.
>
> from the Admin account
>
> $ cd /etc
> $ chmod 600 ssh*
>
> solved the problem
>
>It may have but ... There is no need to restrict permissions on the
>public keys and restricting permissions on /etc/ssh_config may interfere
>with ssh client use by non-Administrator users.  Moreover, I don't think
>/etc/sshd_config needs to be restricted though that could be a judgement
>call.
>
>Perhaps
>
>$ chmod 600 ssh_host_*_key
>
>is enough to fix the private key permissions, if in fact that is the problem.
>
> $ cygrunsrv -Q cygsshd
>....
>
>"cygrunsrv -V -Q cygsshd" will reveal even more information.
>
>--Stephen
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