Search found 143 matches

by vavai
Tue Oct 23, 2018 9:21 pm
Forum: Administrators
Topic: Does fail2ban need iptables?
Replies: 2
Views: 51

Re: Does fail2ban need iptables?

Hi, Fail2ban need iptables to block IP suspected as spammer. You can also looking at https://forums.zimbra.org/viewtopic.php?f=15&t=65051 to see an alternative method to block brute-force attack 2FA feature from Zimbra NE can help reduce possible compromise account as it need OTP for being logge...
by vavai
Tue Oct 23, 2018 9:02 pm
Forum: Installation and Upgrade
Topic: From 8.6 (patch 11) to 8.8.
Replies: 2
Views: 52

Re: From 8.6 (patch 11) to 8.8.

Hi Rick, Two fast questions regarding an in-place upgrade from 8.6- patch 11 (single system running CentOS 6, just 5 email accounts, but "very important" shared calendars). I already have 'proxy' and 'memcached'. (1) Should I use the migration tool in some way, or just run the installer(s)...
by vavai
Tue Oct 23, 2018 11:45 am
Forum: Administrators
Topic: Postfix double-bounce and fqdn
Replies: 3
Views: 161

Re: Postfix double-bounce and fqdn

Hi, I've read what Ubuntuforums described but based on your log, double-bounce is only a result of incorrect configuration. AFAIK, Zimbra never touches main.cf manually and its content setting up by default when install. If you don't mind, you can also paste a relevant log from zimbra.log to see whi...
by vavai
Tue Oct 23, 2018 10:42 am
Forum: Administrators
Topic: Postfix double-bounce and fqdn
Replies: 3
Views: 161

Re: Postfix double-bounce and fqdn

Hi, Its main problem from this error: "Server configuration error". It should be checked what kind of configuration problem produce these error. You can find some relevant info from zimbra.log. The double bounce came as a side effect from Sender address rejected: Domain not found (in reply...
by vavai
Mon Oct 22, 2018 9:33 am
Forum: Administrators
Topic: Error in sending email
Replies: 2
Views: 95

Re: Error in sending email

Do you send an email using Apps, webmail or mail client?
by vavai
Sat Oct 20, 2018 11:22 pm
Forum: Administrators
Topic: Cant shake bruteforce monkey
Replies: 7
Views: 723

Re: Cant shake bruteforce monkey

Hi Mark & JDunphy,

Thank you for share valuable discussion. I'll be take a chance to deploy what you described on your blog as It seems it will help me a lot to deal with brute-force attack and improving our anti spam strategy.
by vavai
Fri Oct 19, 2018 11:21 pm
Forum: Administrators
Topic: Imaps connectivity problem
Replies: 4
Views: 465

Re: Imaps connectivity problem

Hi,

What about disabling firewall for temporary case, looking at possible blacklist/banned IP and nmaping selected port from different IPs? You can also trying to telnet from localhost and different host.

Vavai
by vavai
Fri Oct 19, 2018 4:18 pm
Forum: Administrators
Topic: Cant shake bruteforce monkey
Replies: 7
Views: 723

Re: Cant shake bruteforce monkey

Hi I am having issues combating brute-force attempts on my ZCS server. I have fail2ban in place but it is not helping in this situation, they just come back from a different IP address. My accounts keep getting locked out.Ive blocked entire country's (brazil, indonesia, china) with ip lists from ip2...
by vavai
Fri Oct 19, 2018 1:41 pm
Forum: Migration
Topic: Migration from exchange2013 to zimbra 8.8
Replies: 8
Views: 868

Re: Migration from exchange2013 to zimbra 8.8

Hi,
extreme wrote:Hello everyone!

Please advise how to migrate Calendar, Contacts, Tasks, Agenda from Exchange to Zimbra
Thx.


Did you try Zimbra Migration Wizard? https://www.zimbra.com/downloads/zimbra-migration-tools/
by vavai
Fri Oct 19, 2018 3:58 am
Forum: Administrators
Topic: ZCS 8.8.10 High cpu useage
Replies: 1
Views: 250

Re: ZCS Zimbra Patches: 8.8.10 Patch 1 + 8.8.9 Patch 6

We have an ongoing issue with our Zimbra since upgrade to 8.8.10 Every day we experienced serious issue with Zimbra being very slow for several minutes until eventually crash at sometimes. Checking on the issue we discovered a problem with a java process that we capture here in the attachements. An...

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