s2s error - wait_for_validation connect timeout

Hello!

My ejabberd 2.1.8 fails connecting to jabber server of some hosting provider. And I now other ejabberd installations (jabber.ru for example) that works ok.

I got this in logs:
I(<0.437.0>:ejabberd_s2s_out:1207) : Trying to open s2s connection: myserver -> thatserver with TLS=true
I(<0.437.0>:ejabberd_s2s_out:438) : wait_for_validation: myserver -> thatserver (connect timeout)

I have
{s2s_use_starttls, optional}
in config
and valid (using cacert) server cert with 2048 bit RSA key.

Other servers are ok. Earlier my ejabberd while connecting to servers of that hosting provider used s2s without encryption and everything was ok. And now it got timeout.

Where is the problem and what can I do?

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