Topic "winscp fails connection with "Server's host key did not match the signature supplied""

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kernelhacker
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Joined: 2017-03-10
Posts: 2
Location: Washington DC
Several odd things about this. It happens only with the updated ssh servers. Putty(0.67/0.6Cool and winscp 5.7.7 works fine, and have no problems with unix servers, so it's most likely a bug in winscp.

Enclosed the log, but doesn't have anything helpful. You can try a connection to aresearch.com (doesn't even get to the username) and see. Not sure what else to try at this point (it's probably unhappy about the ciphers, but not sure adding old ciphers is a good thing, plus putty release doesn't require this).

Thanks in advance.
ssh.log (5.22 KB) Private file

Description: Failure log

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martin
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Joined: 2002-12-10
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Location: Prague, Czechia
I cannot connect to aresearch.com with PuTTY 0.68 either. I'm getting the same error message.

Show us your PuTTY 0.68 log file. You probably use a non-default configuration in PuTTY.
kernelhacker
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Joined: 2017-03-10
Posts: 2
Location: Washington DC
Ok... my putty log is attached. I'm not aware of any non-default configuration (not like I'm using a saved session), but since putty sticks things in the registry, who knows. Oddly, trying to connect to another site with putty 0.68 fails, so I'll try to figure out what's the difference between the two when I get the chance. Hopefully, one of us can figure out what is making something unhappy.
putty.log (14.66 KB) Private file

Description: Log to aresearch.com

martin
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Joined: 2002-12-10
Posts: 25946
Location: Prague, Czechia
Your PuTTY probably has the RSA fingerprint of the host key cached. So it prefers that. And it works with RSA.

While I do not have any fingerprint of your host key, so the preferred ECDH is used. And it fails with that. Clear fingerprints in PuTTY registry key and you should get the same problem.
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