[Dovecot] Intermittent "certificate cannot be verified" error

[Uldis Pakuls]

Guy wrote:
> Hi guys,
>
> Not sure where to start looking for this. I've got a few users getting
> intermittent "certificate cannot be verified" messages when connecting
> through SSL to Dovecot. Connections go through haproxy to Dovecot
> 1.1.8 on the back end servers.
> I've got verbose_ssl and auth_debug enabled.
>   
It is SSL error. This error message indicates that the client was unable 
to validate the certificate chain, or that the public key that was used 
to validate the certificate signature is not the correct key.