Have you upgraded?
On 9/6/2019 2:26 PM, Charles Hockenbarger wrote:
I am hoping someone has had a similar situation or a place to point me
as I'm at my wits end and have users unable to send emails.
I've had a toaster running for several years. This particular system
has been running without issues for roughly 12 months after migrating
from CentOS 6 to CentOS 7.
I didn't make any changes yesterday, and email was flowing perfectly.
This morning, we aren't able to authenticate, with Outlook reporting
'None of the authentication methods supported by this client are
supported by your server'. Multiple Android clients are reporting
similar errors. The firewall in front of the server and iptables have
587 open (again, no changes intentionally made in the environment). I
can connect with openssl s_client -starttls smtp -crlf -connect
<server>:587. What is missing is the AUTH line and if I try to execute
an AUTH, I get 503 auth not available (#5.5.3). Selinux is disabled.
My /var/log/maillog stops reporting any vchkpw-submission activity
around 0600 this morning. I've searched and not seen where vchkpw just
stops doing anything.
I'm investigating whether the server has been compromised, but nothing
is showing so far, and this is a very odd behavior to execute if it were.
Any thoughts?
My users have been down since this morning, and I'm flummoxed.
Thank you!
Chas
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