Article ID: 116008, created on Apr 24, 2013, last review on May 1, 2014

  • Applies to:
  • Plesk 11.0 for Linux


1. Install and configure Plesk 11.0.9 on CentOS5.x
2. Create subscription on IPv6
3. Create mailbox
4. Open webmail

Actual Result: Webmail is not available

Expected Result: Webmail is available


The cause is the ip6tables firewall rules in CentOS5.x OS with kernel version < 2.6.20.


Don't use ip6tables. Delete the last rule in the file /etc/sysconfig/ip6tables:
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp6-adm-prohibited

Then run this command:
# service ip6tables restart

Webmail will work, but the problem can appear in other places.
This problem can be found not only in webmail; it can also block connections to any other page.

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