memcached and nginx pop3/imap auth problem.

[serivo]

I have a strange problem with memcached. When I have commented out all memcached lines in my /opt/zimbra/conf/nginx.conf pop3 authentication works perfectly. But with these lines I have one successfull login and then during about a minute - all logins are failing When I have started memcached with -vv option, I see something like this:
---
<3 server listening
<7 new client connection
<8 new client connection
<8 incr ip:192.0.2.1 1
>8 NOT_FOUND
<8 add ip:192.0.2.1 0 60 1
>8 STORED
<8 incr usr:test@test.example.com 1
>8 NOT_FOUND
<8 add usr:test@test.example.com 0 60 1
>8 STORED
<8 get POP3:test@test.example.com
>8 END
<8 add POP3:test@test.example.com 0 3600 18
>8 STORED
<8 incr ip:192.0.2.1 1
>8 2
<8 incr usr:test@test.example.com 1
>8 2
<8 get POP3:test@test.example.com
>8 sending key POP3:test@test.example.com
>8 END
<8 connection closed.
<7 incr ip:192.0.2.1 1
>7 3
<7 incr usr:test@test.example.com 1
>7 3
<7 get POP3:test@test.example.com
>7 sending key POP3:test@test.example.com
>7 END
<7 connection closed.
---
Zimbra version 5.0.3.
--
WBR,
Sergey.

[mansoor]

Hello,

Could you please paste the values of the following configuration directives from /opt/zimbra/conf/nginx.conf ?

mail_login_user_max
mail_login_user_ttl
mail_login_ip_max
mail_login_ip_ttl

Regards,
Mansoor Peerbhoy

[serivo]

Originally Posted by mansoor

Hello,

Could you please paste the values of the following configuration directives from /opt/zimbra/conf/nginx.conf ?

mail_login_user_max
mail_login_user_ttl
mail_login_ip_max
mail_login_ip_ttl

Regards,
Mansoor Peerbhoy

Here they are:
---
# egrep '^\s*mail_login.*(max|ttl)' /opt/zimbra/conf/ngin*.conf
/opt/zimbra/conf/nginx.conf: mail_login_ip_max 0;
/opt/zimbra/conf/nginx.conf: mail_login_ip_ttl 3600s;
/opt/zimbra/conf/nginx.conf: mail_login_user_max 0;
/opt/zimbra/conf/nginx.conf: mail_login_user_ttl 3600s;
---

[mansoor]

Hm,

From your config, it's clear that the rate limiting for user-logins and ip-logins is turned off. The only other use to which memcached is put, by NGINX POP/IMAP proxy, is to cache the POP/IMAP routes of users.

Do all POP accounts face the problem of logging in ? If so, can you please paste the relevant section of nginx.log ? Also, if it is specific to a single mailbox only, was the mailbox moved from one mailhost to another ?

Regards,
Mansoor