No support for any authentication method message

nowki

Registered
Feb 12, 2019
2
0
1
Taiwan
cPanel Access Level
Root Administrator
Hi,

After replacing the new server, the message "There is no support for any authentication method supported by this client".

Very special:
The same smtp is set in win10 and can be sent successfully.
Win7 returns "503 Valid RCPT command must precede DATA".

Both are using outlook
 

nowki

Registered
Feb 12, 2019
2
0
1
Taiwan
cPanel Access Level
Root Administrator
problem solved
  • have disabled the "Require clients to connect with SSL or issue the STARTTLS command before they are allowed to authenticate with the server." setting on the new server.
 

cPanelLauren

Forums Analyst II
Staff member
Nov 14, 2017
7,508
591
263
Houston
cPanel Access Level
DataCenter Provider
Hello @nowki

While that does resolve the immediate issue it doesn't resolve the cause of the inability to connect. Depending on which mail client you were using my assumption here is that the connection was being made using the no longer supported SSL protocol as opposed to TLS v1.2

I'd advise checking the exim main logs to confirm whether or not this is indeed the case though.