SSH... via Windows CMD OK; via Putty - REFUSED

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hatcreek68
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Joined: 29 Nov 2016
Posts: 27
PostPosted: Sat Feb 11, 2023 3:01    Post subject: SSH... via Windows CMD OK; via Putty - REFUSED Reply with quote
Are there any reasons why I can SSH into DD-WRT via my PC CMD, but Putty is getting refused (edit: also WINSCP is refused) by DD-WRT? Is there some Putty setting to switch?

I see some google-results talking about various builds not having SSH working, and another post about Putty connections refused, but didn't find anything definitive yet.

Equipment:
DD-WRT v3.0-r51011 std (c) 2022 NewMedia-NET GmbH
Release: 12/12/22
Board: Netgear R6700 v3
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Per Yngve Berg
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Joined: 13 Aug 2013
Posts: 6870
Location: Romerike, Norway
PostPosted: Sat Feb 11, 2023 3:14    Post subject: Reply with quote
Probably the key that is in the wrong format.
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hatcreek68
DD-WRT Novice


Joined: 29 Nov 2016
Posts: 27
PostPosted: Sat Feb 11, 2023 3:23    Post subject: Reply with quote
Per Yngve Berg wrote:
Probably the key that is in the wrong format.


I'm working on a new DD-WRT setup, and have not saved keys yet, just using user/PW for now.

I double checked putty/winscp old saved logins don't have keys anymore, and just tried new connections from scratch... nothing... but CMD works just fine. seems weird.

Tried adding winscp.exe to the windwows firewall... same no change.
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hatcreek68
DD-WRT Novice


Joined: 29 Nov 2016
Posts: 27
PostPosted: Sat Feb 11, 2023 3:27    Post subject: Reply with quote
<SOLVED>
I tried reinstalling winscp.... but solution was clearing out (years) of old data.

WinSCP / Tools (bottom left) / Clean up / select all

So bad/outdated stuff in the appdata I guess.... now connects as expected.

----

Have not fixed putty, but maybe a similar process will help.
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blkt
DD-WRT Guru


Joined: 20 Jan 2019
Posts: 5700
PostPosted: Sat Feb 11, 2023 20:29    Post subject: Reply with quote
https://duckduckgo.com/?q=putty+registry

https://documentation.help/PuTTY/faq-settings.html
https://documentation.help/PuTTY/config-file.html
https://documentation.help/PuTTY/faq-cleanup.html#QA.8.2 <--

https://www.chiark.greenend.org.uk/~sgtatham/putty/docs.html
https://the.earth.li/~sgtatham/putty/latest/puttydoc.txt
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redhawk0
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Joined: 04 Jan 2007
Posts: 11564
Location: Wherever the wind blows- North America
PostPosted: Tue Feb 14, 2023 14:22    Post subject: Reply with quote
I'm not sure why so many are having putty issues.

Move Ed25519 to the top...move RSA to second in the list...and unchecked "Prefer algorithms for which a host key is known"

That's all that I did to make putty work with recent builds.

I have no issues connecting via SSH

redhawk

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blkt
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Joined: 20 Jan 2019
Posts: 5700
PostPosted: Tue Feb 14, 2023 16:10    Post subject: Reply with quote
Certainly works as well, if clearing out old host keys or starting over with clean config isn't an option (putty -clear).

https://svn.dd-wrt.com/changeset/51691

Message: cherrypick bugfix if hostkey is changed from rsa to ed25519 which is the case for newer dd-wrt versions
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