In life, people always make mistakes inadvertently and cause their accounts to be stolen. If someone else accesses your account, they will be able to do anything with it, even steal money from the bank account. One of the most common habit is that people always subconsciously ignore Windows “available updates” reminders, which leads to vulnerabilities in computers.

[SOLVED] SASL LOGIN authentication failed … – Zimbra

https://forums.zimbra.org/viewtopic.php?t=29745

Sep 12, 2014

 · Postby tmoreland » Thu Sep 18, 2008 5:20 pm. We are using a new web application that has hard coded the use of TLS for sending email notifications. Every email it sends fails with: warning: unknown [192.168.1.17]: SASL LOGIN authentication failed: authentication failure. I assume I need to tell Zimbra to allow this host but I thought I already …

Saslauth Failed (curl easy perform error) – Zimbra :: Tech …

https://wiki.zimbra.com/wiki/Saslauth_Failed_(curl_easy_perform_error)

Run the following command to check saslauth with the mailbox node. The same curl command works in the backend during saslauth. $ curl -X POST -u zimbra.user2@example.com:test@123 -d ‘authType=sasl’ https://mbox1.example.com:7073/service/admin/soap/ -k</pre>.

SMTP SASL authentication failure – Zimbra Forums

https://forums.zimbra.org/viewtopic.php?t=1120

Sep 12, 2014

 · Oct 10 17:20:45 host saslauthd[11583]: do_auth : auth failure: [user=] [service=smtp] [realm=] [mech=zimbra] [reason=Unknown] This happens with TLS set on & off in SMTP authentication on the server. Restarting saslathd as suggested in another forum thread didn’t help either

Zimbra Tips : How To Restrict SASL Login/Access – Ahmad …

https://imanudin.net/2018/06/13/zimbra-tips-how-to…

Jun 13, 2018

 · Because i have a lot of sasl authentication failed messages on /var/log/mail.log like “postfix/submission/smtpd[25522]: warning: unknown[104.219.42.106]: SASL LOGIN authentication failed: authentication failure” but there is no email address, just the ip address…

Postfix sasl log "SASL LOGIN authentication failed …

https://www.howtoforge.com/community/threads/…

Jun 17, 2020

 · David, != is technical language for "does not equal", so in this case, the SASL LOGIN authentication failed message doesn’t mean the account has been hacked. It simply means a wrong username / password has been used. It could be a brute-force hack …

Blocking SASL logins? – Zimbra Forums

https://forums.zimbra.org/viewtopic.php?t=68367

Jun 15, 2020

 · SASL is used by IMAP/POP clients to send email on port 587 after authenticating with their Zimbra credentials. I just did a blog post, albeit for Ubuntu’s UFW, that shows how to implement fail2ban to block bad actors trying to brute force accounts using this vector.

Understanding And Troubleshooting Authentication Log

https://wiki.zimbra.com/wiki/Understanding_And…

My initially login creates these authentication events below. First, to give you a general impression what logs will hold information on a username and the ip address the client is connection from. The -l option for grep/egrep will just list the files names that have a math to the search. Now to see what the events are.

How-to-restrict-ssl-loginZimbra :: Tech Center

https://wiki.zimbra.com/wiki/How-to-restrict-ssl-login

Overview: We can restrict SASL login for a user on postfix level in Zimbra. Sometime a system administrator needs to block SASL authentication of a user due to various reasons like company policy where web-client is allowed only for some users, account was compromised and spammer is sending spam emails using SASL authentication etc.

How to setup Fail2ban to avoid Postfix SASL attack

https://bobcares.com/blog/fail2ban-postfix-sasl

Dec 06, 2018

 · Now, when this authentication fails, the log files at /var/log/mailog will have entries like this : Aug 31 22:23:52 hostxyz postfix/smtpd[38697]: warning: unknown[192.168.xx.xx]: SASL LOGIN authentication failed : authentication failure Aug 31 22:23:52 hostxyz postfix/smtpd[38697]: lost connection after AUTH from unknown[192.168.xx.xx]

Simple Troubleshooting For SMTP Via Telnet And … – Zimbra

https://wiki.zimbra.com/wiki/Simple…

To connect to a server using TLS/SSL run something like this: openssl s_client -starttls smtp -crlf -connect zcs723.EXAMPLE.com:25. Now you can run one of the above telnet sessions like you had before. You will most likely still need to log in. Default zimbra ports to be aware of and test: port 25.

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