I’m just open ticket for mailing restriction and this firewall problem, but no answer so confuse
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Sorry for the trouble. We had to restrict droplets running VestaCP due to an exploit in the wild that was being used to compromise servers and use them in DDoS attacks.
A ticket should be open on your account regarding this action. If you only installed VestaCP yesterday you may have the patch already in place for this issue and if so, our team can remove the network block.
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