WS-FTP unable to connect to server after software update

I have a bit of an authentication problem. I updated some packages on my Slackware64 14.1 system yesterday. Today, when a client was trying to WS-FTP to his account, he was blocked. The WS-FTP log is below. I've tried restarting openSSH. I can ssh to this account, but the client cannot WS-FTP. I'm sure it has something to do with the update, but I don't have any idea where to look. Need help

KexInitPacket (Client):  no kex guess present
KexAlgorithms
diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
00:  diffie-hellman-group-exchange-sha1
01:  diffie-hellman-group1-sha1
.
.
.
Failure to agree with SSH server on compatible algorithms
SSH Transport agreed algorithms
     Purpose: key agreement             Algo: invalid
     Purpose: server host key           Algo: ssh-rsa
     Purpose: encryption cs             Algo: aes128-ctr
     Purpose: encryption sc             Algo: aes128-ctr
     Purpose: MAC cs                    Algo: hmac-sha1
     Purpose: MAC sc                    Algo: hmac-sha1
     Purpose: compression cs            Algo: none
     Purpose: compression sc            Algo: none
Failed SSH Key Exchange
SSH Transport closed.

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LVL 85

Dave BaldwinFixer of ProblemsCommented: 2016-02-19

It appears he needs to update WS-FTP. Or try Filezilla, it is usually very current.
https://filezilla-project.org/

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MarkAuthor Commented: 2016-02-19

Hmmm, I'm probably not going to get them to do that. Is there a way to change something on my end?

I think you need more info. What FTP client works form your computer? Have you tried WS-FTP on your computer? Note that older algorithms and methods are being 'expired' all over the web. They may not have a choice.

Dave Baldwin:

older algorithms and methods are being 'expired' all over the web.

Yes, I know, I've run into this before. I've asked the fellow to check on updating his WS-FTP.

I am able to sftp from a remote linux host, no problem. I don't have access to WS-FTP.

I'm wondering if I can somehow specify an older encryption mechanism in a configuration on my Linux server.

I don't know. Please click on "Request Attention" above and see if someone else knows.

MarkAuthor Commented: 2016-03-02

The user updated his WS-FTP. Problem solved.

WS-FTP unable to connect to server after software update

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