XMailforum is a readonly knowledge archive now.

Registering as a new user or answering posts is not possible anymore.

Might the force be with you, to find here what you are looking for.

2019-09-20 - hschneider, Admin

Cookie Disclaimer: This forum uses only essential, anonymous session cookies (xmailforum*), nothing to be scared of.

XMail Forum -> Unable To Get Udp Dns Response

Reply to this topicStart new topicStart Poll

> Unable To Get Udp Dns Response, all messages stops at queue
bOOster
Posted: Nov 21 2007, 12:07 PM
Quote Post


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
PMEmail Poster
Top
bOOster
Posted: Nov 21 2007, 01:53 PM
Quote Post


Junior Member
**

Group: Members
Posts: 31
Member No.: 2501
Joined: 13-April 07



Ok... goes back to 1.24 Stable - problem dissapears. confused.gif
PMEmail Poster
Top
Digdug
Posted: Nov 21 2007, 04:45 PM
Quote Post


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
PMEmail Poster
Top
bOOster
Posted: Nov 22 2007, 02:54 AM
Quote Post


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.
PMEmail Poster
Top
hschneider
Posted: Nov 22 2007, 07:42 AM
Quote Post


No - I'm not an answering script ...
Group Icon

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
PMEmail PosterUsers Website
Top
Digdug
Posted: Nov 22 2007, 08:16 AM
Quote Post


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
PMEmail Poster
Top
bOOster
Posted: Nov 23 2007, 10:11 AM
Quote Post


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.
PMEmail Poster
Top
Digdug
Posted: Nov 23 2007, 10:29 AM
Quote Post


Member
***

Group: Members
Posts: 92
Member No.: 1456
Joined: 10-January 05



Ok, I'll try that, thanks!
I'll post my findings here.
PMEmail Poster
Top
Digdug
Posted: Nov 26 2007, 08:33 PM
Quote Post


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.
PMEmail Poster
Top
0 User(s) are reading this topic (0 Guests and 0 Anonymous Users)
0 Members:
« Next Oldest | Documentation and Knowledge Base | Next Newest »

Reply to this topicStart new topicStart Poll