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Unable To Get Udp Dns Response, all messages stops at queue

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bOOster	Posted: Nov 21 2007, 12:07 PM
Junior Member Group: Members Posts: 31 Member No.: 2501 Joined: 13-April 07	XMail 1.25b22 FreeBSD 6.2 Does XMail tryes resolv names directly from root DNS servers or use local server (resolv.conf?) What protocols (UDP,TCP) resolver uses? Using tcpdump for discovering close UDP ports - no success. did not see any DNS depending blocking packets.. dig @ns.<domain.ru> mail.<domain.ru> +notcp works with no problem!! that is my topology modem \| \| nat 1:1 -> External Gateway Ext-IP \| Security Gateway (DMZ Transparent) \| \| \| Ext-IP External Gateway (Redirect some ports (25,110) to Mail Server mail-Int-IP) \| Int-IP \| \| Mail-Int-IP Mail Server

bOOster	Posted: Nov 21 2007, 01:53 PM
Junior Member Group: Members Posts: 31 Member No.: 2501 Joined: 13-April 07	Ok... goes back to 1.24 Stable - problem dissapears.

Digdug	Posted: Nov 21 2007, 04:45 PM
Member Group: Members Posts: 92 Member No.: 1456 Joined: 10-January 05	I have the same problem with v1.25-prexx in Windows, looks like XMail is "waiting" for a response?? It does not happen with all incomming connections. I already asked davide about this, but it only happened with one incomming IP, but now I see more with the same problem. Strange thing is, it does not happen all the time... See previous post: http://xmailforum.homelinux.net/index.php?showtopic=4016

bOOster	Posted: Nov 22 2007, 02:54 AM
Junior Member Group: Members Posts: 31 Member No.: 2501 Joined: 13-April 07	I think that 1.24 have the same problem, but from other, single side- Trying to send message to halykbank.kz domain. XMail said that message have DNS Problem - Server address invalid! But standart FreeBSD resolver have no problem resolving MX and IP address for halykbank.kz domain.

hschneider	Posted: Nov 22 2007, 07:42 AM
No - I'm not an answering script ... Group: Admin Posts: 6631 Member No.: 195 Joined: 19-June 02	Please forward all this directly to Davidel at xmailserver.org. ThanX ! -------------------- Bye, Harald -- Download XMail Queue Manager 1.46 NOW: XMail Server Tools -- Cross platform remote queue management! -- Message analyzing on the fly! -- Builtin diagnostics knowledge base! -- Manages multiple mail queues! Sponsored by CD-Produktion und DVD-Produktion and Homestaging Saarland - Immobilien schneller verkaufen in der Region Saarland, Rheinland-Pfalz und Luxembourg

Digdug	Posted: Nov 22 2007, 08:16 AM
Member Group: Members Posts: 92 Member No.: 1456 Joined: 10-January 05	Just something about the last domain you mentioned, azimut.kz They are listed in serveral RBL lists, maybe Custmapslist is causing problems? halykbank.kz is NOT listed

bOOster	Posted: Nov 23 2007, 10:11 AM
Junior Member Group: Members Posts: 31 Member No.: 2501 Joined: 13-April 07	Ok. I think i fix the problem with Davide help. By default XMail DNS tryes to use root servers for name resolution directly. But if you mail server located behind firewall sometimes this is NOT WORK!!! but a computer resolver (DNS) where XMail hosts works perfectly. To FIX it: uncomment SmartDNSHost option and add IP address of local DNS server. SmartDNSHost "192.168.1.1:udp" there 192.168.1.1 is a gateway computer (directly connected to internet) with BIND running.

Digdug	Posted: Nov 23 2007, 10:29 AM
Member Group: Members Posts: 92 Member No.: 1456 Joined: 10-January 05	Ok, I'll try that, thanks! I'll post my findings here.

Digdug	Posted: Nov 26 2007, 08:33 PM
Member Group: Members Posts: 92 Member No.: 1456 Joined: 10-January 05	Since the change I have had no more DNS "hangs". All XMail queries work properly now.

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