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Revision as of 09:04, 29 May 2020

Saslauth Failed (curl_easy_perform error)


   KB 24091        Last updated on 2020-05-29  




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Problem

IMAP/POP clients getting a password pop-up window and not able to send and receive the e-mails. When putting correct username and password we are getting an authentication error.

Following error in Zimbra.log

Nov 28 15:06:57 mbox1 saslauthd[45799]: auth_zimbra: ztest@xxxxxx.com auth failed: curl_easy_perform: error(56): Received HTTP code 503 from proxy after
CONNECT
Nov 28 15:06:57 mbox1 saslauthd[45799]: do_auth         : auth failure: [user=ztest@xxxx.com] [service=smtp] [realm=xxxx.in] [mech=zimbra] [rea
son=Unknown]
Nov 28 15:06:57 mbox1 postfix/smtpd[18938]: warning: unknown[10.0.7.162]: SASL LOGIN authentication failed: authentication failure
Nov 28 15:06:57 mbox1 postfix/smtpd[18938]: lost connection after AUTH from unknown[10.0.7.162]


Solution

Need to confirm, the customer has enabled additional proxy on there environment like Nginx proxy or Squid proxy.

Step
  • Run following command to check:
    # env | grep -i proxy
    $ curl -X POST -u zimbra.user2@example.com:test@123 -d 'authType=sasl' https://mbox1.example.com:7073/service/admin/soap/ -k
  • Please remove additional proxy and restart the MTA service to invalid the old saslauth connection which was established.
    $ zmmtactl restart


Why this issue occurred?

When the saslauth happens on the MTA server it will check ZCS saslauthd lookup server on port 7073, which is a mailbox server. If the local proxy configured this request will handle by the local proxy and local proxy don't know where to forward this request. That's why we get HTTP 503 and 502 errors.


How SASL works

SASL is not a protocol but is a framework that can be used with protocols such as SMTP. For each protocol that uses SASL, there will be a specification (an Internet Standard in cases where the base protocol is an Internet Standard) as to how the protocol uses SASL. This means that SASL can be used with a wide range of protocols, and can be adapted to the details of how any specific protocols work.

The basic operation of SASL is straightforward. The server provides a list of supported authentication mechanisms, and then the client says which one will be used (based on the client’s capabilities and security requirements).

Protocols that contain SASL support include:

  • LDAP (Internet Standard Lightweight Directory Access Protocol)
  • SMTP (Internet Standard Simple Message Transfer Protocol)
  • POP3 (Internet Standard Post Office Protocol v3)
  • IMAP (Internet Standard Internet Mail Access Protocol)
  • XMPP: Extensible Messaging and Presence Protocol
  • Isode's SOM (Switch Operations and Management) Protocol

This external link contains more information about SASL.

Submitted by: Gopal Singh Bhandari
Verified Against: ZCS 8.8 Date Created: 2020-04-13
Article ID: https://wiki.zimbra.com/index.php?title=Saslauth_Failed_(curl_easy_perform_error) Date Modified: 2020-05-29



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