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Karsten Kemper

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Hello together

1.
I am getting alot of error messages regarding failed dns lookups, enabled the dns resolver, following is the output.

Quote:

[13/Apr/2015 11:13:15] DNS failure while trying to find address xxx.77.163.46.dnsbl.sorbs.net in blacklist SORBS DNSBL

[13/Apr/2015 11:13:10][4860] {dns} PTR record: IP=46.163.77.xxx, name=mailer1111.yyy.de
[13/Apr/2015 11:13:10][4860] {dns} Searching cache for A records for host xxx.77.163.46.zen.spamhaus.org
[13/Apr/2015 11:13:10][4860] {dns} Searching DNS for A records for host xxx.77.163.46.zen.spamhaus.org
[13/Apr/2015 11:13:10][4860] {dns} DNS server(s) count: 1, (0 detectected as duplicate(s)).
[13/Apr/2015 11:13:10][4860] {dns} DNS server address(es): 192.168.1.20
[13/Apr/2015 11:13:10][4860] {dns} Querying server no. 1, address 192.168.1.20
[13/Apr/2015 11:13:10][4860] {dns} Got answer
[13/Apr/2015 11:13:10][4860] {dns} Host not found
[13/Apr/2015 11:13:10][4860] {dns} Searching cache for A records for host xxx.77.163.46.dnsbl.sorbs.net
[13/Apr/2015 11:13:10][4860] {dns} Searching DNS for A records for host xxx.77.163.46.dnsbl.sorbs.net
[13/Apr/2015 11:13:10][4860] {dns} DNS server(s) count: 1, (0 detectected as duplicate(s)).
[13/Apr/2015 11:13:10][4860] {dns} DNS server address(es): 192.168.1.20
[13/Apr/2015 11:13:10][4860] {dns} Querying server no. 1, address 192.168.1.20
[13/Apr/2015 11:13:15][4860] {dns} timeout
[13/Apr/2015 11:13:15][4860] {dns} No answer obtained
[13/Apr/2015 11:13:15][4860] {dns} Cannot resolve query for name xxx.77.163.46.dnsbl.sorbs.net


The dnsbl request that gets the timeout is not only dnsbl.sorbs.net though but varying and can be any dnsbl hoster configured to use, i.e. zen spamhaus was working in the example above but did not work some time later
Quote:

[13/Apr/2015 11:45:50] DNS failure while trying to find address xxx.43.63.193.zen.spamhaus.org in blacklist SpamHaus SBL-XBL


Am i missing something here, from seeing the logs it seems that about 5% of dnsbl lookups fail due to timeouts.

2.
Another thing and maybe related to the first problem is probably just a misconfiguration but why does KC try check ptr records for local clients?
Quote:

[13/Apr/2015 11:13:14][3420] {dns} Searching DNS for PTR records for IP address 192.168.1.155
[13/Apr/2015 11:13:14][3420] {dns} DNS server(s) count: 1, (0 detectected as duplicate(s)).
[13/Apr/2015 11:13:14][3420] {dns} DNS server address(es): 192.168.1.20
[13/Apr/2015 11:13:14][3420] {dns} Querying server no. 1, address 192.168.1.20
[13/Apr/2015 11:13:14][3420] {dns} Got answer
[13/Apr/2015 11:13:14][3420] {dns} Host not found


Any advice is welcome.

With kind regards

KC 8.3.4 Patch 1 (3377 )
Windows 2008 R2 Server
Names and IP Adresses changed
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