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This bug is created as a clone of upstream ticket:
https://fedorahosted.org/freeipa/ticket/2668

During upgrade is necessary to adjust "connections" parameter in /etc/named.conf.

Minimal value depends on configuration:
- without persistent search: "connections 2"
- with persistent search enabled: "connections 3"

Another option is to simply delete "connections" parameter, if it's <= 2 (and let plugin use correct default value).


Required parameters without persistent search:
{{{
dynamic-db "ipa" {
        arg "psearch no";
        arg "connections 2";
};
}}}


Required parameters with persistent search:
{{{
dynamic-db "ipa" {
        arg "psearch yes";
        arg "connections 3";
};
}}}