I used Putty for many years until Windows included a good version of ssh. I try to load up as few apps on my system as I need to get my job done. We each have our own ideas, but I try not to recommend loading 3rd party apps to other users when the OS comes with a working version of the app.
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Windows SSH is not installed by default. If possible, I try not to install more Windows optional “features” than necessary. When setting up a new Windows system, I uninstall unnecessary bloatware and when 3rd-party apps are better.
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Thank you for suggesting to use another or an older ssh client. I believe that something in openssh changed and that other clients may exhibit similar behavior in the future. I still hope that some other way could be found than using a different client.
Just as a FYI, the ssh client is installed by default in Windows 10 and 11. I know this as I reload Windows regularly on VMs for testing, and a quick Google search confirms this:
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XE300 with OpenWrt 19.07
Windows ssh works with it.
The Putty is easy for newbie, so I keep it on the docs. Some customers just want to type some commands.
For pro users, they don’t need to read the ssh docs 
.
SSH on windows 10/11 is OK.
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I use the Cygwin ssh client as I like bash over cmd or powershell. YMMV
I get the same fairly easy to overcome, as below.
Simon@MSI ~
$
Simon@MSI ~
$
Simon@MSI ~
$ ssh root@10.101.16.1
Unable to negotiate with 10.101.16.1 port 22: no matching host key type found. Their offer: ssh-rsa
Simon@MSI ~
$ ssh -oHostKeyAlgorithms=+ssh-rsa root@10.101.16.1
root@10.101.16.1's password:
You can permanently mod you Home directory ssh config quckest way using my example:
Simon@MSI ~
$ echo Host 10.101.16.1 >> .ssh/config
Simon@MSI ~
$ echo -e "\tHostKeyAlgorithms ssh-rsa" >> .ssh/config
Simon@MSI ~
$ ssh root@10.101.16.1
root@10.101.16.1's password:
Simon
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FYI, not for any of my Windows 10 systems … maybe for yours. I am happy with that.
I do not work for and I do not have formal association with GL.iNet
There are 13 “Windows 10” versions, all with install iso’s. SSH is included by default since 1803, from 2018! If you are using old iso’s to install then that is why. You should always use the latest Windows install iso anyway, which is 21H2.
And why not use Windows 11 in the first place? As stable as Windows 10 with better performance and new features.
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I have no intention to migrate from Windows 10 to Windows 11. Nope, I should NOT always use the latest Windows, complete with new bugs. Windows 11 is not currently a mandatory update and I will deal with it if/when it becomes mandatory.
If you want to do that, that is okay with me. “If it ain’t broke don’t fix it”.
I do not work for and I do not have formal association with GL.iNet
20H2 is the oldest maintained version that is getting security fixes and other things. “Ain’t broke” > “Secure computer”, i guess that is fine, you do you. This is not recommended for anyone though. Windows 10 22H2 is also only supported until June 13, 2023, so you will need to go to Windows 11 soon anyway.
And back to the original issue. Yes SSH is included in the latest versions of Windows 10/11 when installed from an iso or other way. If you haven’t installed the PC since Win10 1803, then you manually need to install SSH.
I have until Oct 14, 2025 before having to go to Windows 11. In the meantime,I will install critical/mandatory Windows 10 security updates and patches (as I always have). Nope, I do not “need” to manually install SSH.
I do not work for and I do not have formal association with GL.iNet
In the same link, check the table under, End Date. It’s not guaranteed they will release a new version, and that version expires next year. 
We already know you want to use Putty, while Kitty is better with automatic logon and so on, others might still want to use the built in SSH client.
In English “then you need to” has multiple meanings. Either YOU as an individual, or you as in users of the operating system that need to do something to be able to use something. I thought the meaning in this case was clear but seems like it wasn’t. Thanks for letting me expand on that to make it more clear.
Check the Important section at the top:
Microsoft will continue to support at least one Windows 10 release until October 14, 2025.
Yes, everyone can choose which software they want to use. That is what I indicated in Post 5, when eric stated “I’m not sure why anyone still uses Putty or cygwin on current versions of Windows 10”.
I do not work for and I do not have formal association with GL.iNet
In the same box you can see that updates are reduced to annual updates. That includes security patches, they won’t come as frequently as before.
You can also check your install updates for KB5005463, which is the Windows 11 PC check. Unless you are manually removing updates, you are slowly being pushed towards Windows 11 anyway.
And Eric is completely right. Why would people be using Putty when there is Kitty, or Cygwin when Windows has a built in client. No good reason is the answer.
Security patches are all I want from Windows 10.
I use PuTTY because I like it best, which is the best reason. I like sushi also even if some people not. 
I do not work for and I do not have formal association with GL.iNet
Some people like to swim against the current, others with 
True! In a democracy, everyone gets to chose!
I do not work for and I do not have formal association with GL.iNet
Hmm 
Maybe i’m wrong but does that error not say that your public key/fingerprint is wrong?
I can remember (afaik for every client ive used putty or termius).
If you use it for the first time you get asked to accept the public key or fingerprint.
Ive had once a time I clicked cancel and I wasn’t able to login back, got a smilliar error even when I had enabled password authentication, but that doesn’t mean the protocol is inaccessible, in that case you need a way to reset that specific prompt.
Well of course changing client might help, but that doesn’t fix the latter, I once hosted a server then decided to reinstall because of laziness but of course thats not how I would go about how to fix it 
I wonder how does one reset this prompt for putty or OP default client?
Soz, due the off topic comments I kinda got confused about the issue from the OP.
I believe on a linux client there should be a location of /etc/ssh/authorized_keys to reset it?, How does that work on different ssh clients on windows to get a idea?, I think if the OP deletes this file or fingerprint that it may just works again.
This is the solution, explained on on this website.
Please be careful though when executing this command:
$ echo Host 10.101.16.1 > .ssh/config
If you have existing settings in .ssh/config that command will overwrite them. smiths, maybe you could change that line to make an append (>>) instead:
$ echo Host 10..101..16..1 >> .ssh/config
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