AUTH command ok. Expecting TLS Negotiation on FTP server running on Win 2019 IIS 10

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PandiPanda
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AUTH command ok. Expecting TLS Negotiation on FTP server running on Win 2019 IIS 10

I have configured a FTP server on a Windows 2019 server IIS 10 platform, configured to use SSL explicitely.

When I use WinSCP from another server, I can successfully connect to this FTP server using FTPS.

When I use WinSCP from a desktop in my office, I get the message:
AUTH command ok. Expecting TLS Negotiation.
And I cannot connect.

So this seems related to my desktop configuration, which is a Windows 10 PC connected to a Tenda 4G router.

Any idea on how to diagnose this deeper and fix it?

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martin
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Re: AUTH command ok. Expecting TLS Negotiation on FTP server running on Win 2019 IIS 10

Please attach full session log files from both machines (using the latest version of WinSCP).

To generate the session log file, enable logging, log in to your server and do the operation and only the operation that causes the error. Submit the log with your post as an attachment. Note that passwords and passphrases not stored in the log. You may want to remove other data you consider sensitive though, such as host names, IP addresses, account names or file names (unless they are relevant to the problem). If you do not want to post the log publicly, you can mark the attachment as private.

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PandiPanda
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log files

Please find attached log files from the WinSCP session and from the FTP server.
  • u_ex210409.log (358 Bytes, Private file)
Description: FTP log file (Win 2019 IIS 10 FTP server)
  • s1-OVH-FTpKpsUser.log (6.37 KB, Private file)
Description: WinSCP log file

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martin
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Re: AUTH command ok. Expecting TLS Negotiation on FTP server running on Win 2019 IIS 10

I've meant logs from both client machines. The one, where it works, and the one, where it does not. Also does any other FTP client work on the machine, where WinSCP does not?

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