Thank you so much for your help! It works now, I switch from `ssh-keygen 
`which generate RSA 3072 bit ssh key to `ssh-keygen -t ed25519`.

Sincerely,
Yueqi
On Monday, July 18, 2022 at 7:35:19 AM UTC-4 dim...@gmail.com wrote:

> What kind of ssh key have you created? Not all types are accepted by trac.
>
> On Mon, 18 Jul 2022, 12:34 Dima Pasechnik, <dim...@gmail.com> wrote:
>
>>
>>
>> On Mon, 18 Jul 2022, 11:52 Yueqi Li, <nicole...@gmail.com> wrote:
>>
>>> Hi everyone, 
>>>
>>> I removed whole .ssh file and create new ssh key and also paste the 
>>> public key to sagemath preference, but it still not work and I got 
>>> following warning.
>>> "yueqili@Yueqis-MacBook-Pro sage % ssh g...@trac.sagemath.org help 
>>>
>>> The authenticity of host 'trac.sagemath.org (104.197.143.230)' can't be 
>>> established.
>>>
>>> ECDSA key fingerprint is 
>>> SHA256:4Op/q3b5792x+F1lHSKRi5UIORAPDlIFVA5cUq9YVXI.
>>>
>>> This key is not known by any other names
>>>
>>> Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
>>>
>>> Warning: Permanently added 'trac.sagemath.org' (ECDSA) to the list of 
>>> known hosts.
>>>
>>> g...@trac.sagemath.org: Permission denied (publickey)."
>>> I'm wondering if any one know how to solve it. Thanks for any help and 
>>> advice.
>>>
>>>
>>> Sincerely,
>>> Yueqi 
>>>
>>>
>>> On Tuesday, June 14, 2022 at 12:05:03 PM UTC-4 Yueqi Li wrote:
>>>
>>>> Dear all,
>>>>
>>>> I have trouble getting access to the public key. The message said the 
>>>> public key permission denied. The public key was pasted to my sage 
>>>> preference page, and I also have public key and private key in my .ssh 
>>>> file. I'm wondering if anyone can help me with that. Thank you so much for 
>>>> any help!
>>>>
>>>> Sincerely,
>>>> Yueqi 
>>>>
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>>>
>>

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