Just following up to close this discussion. On Sun, 2012-05-06 at 09:35:24 -0400, Wietse Venema wrote:
> Sahil Tandon: > > May 5 10:00:26 mx1 postfix/postscreen[38500]: warning: psc_dnsbl_request: > > connect to private/dnsblog service: Connection refused > > May 5 10:00:26 mx1 last message repeated 8 times > dnsblog results. > ... > Whatever this problem may be, it should be easy enough to re-create > with "smtp-source -A" by setting up a dummy postfix instance with: > > - pregreet turned off > - the smallest-possible greet-wait > - sending dnsbl queries to a wild-card local DNS server > > This will reduce sharing of DNSBL results between multiple SMTP > sesssions (and thus increase the DNSBL lookup rate). > ... I could not reproduce the warning with smtp-source, but FWIW it recurs daily -- with varying frequency -- on the production MX. I enabled verbose logging for dnsblog(8) and postscreen(8) for a few hours, and could not[*] glean anything useful from the logging that precedes the warning. Anyway, this is not a major problem for me, but rather something that aroused curiosity. So, we needn't waste any more time on it. :) However, if someone else happens to experience a similar issue in the future, I'd be happy to compare logs (both verbose and otherwise) off-list. [*] This is likely due to lack of clue. -- Sahil Tandon
