Server :: Postfix DNS: Why Does It Not Check Hosts File
Mar 22, 2011
I run a few virtual servers at home behind a NAT, including an e-mail server, with dynamically updated dns records pointing to each of the servers. Consequently, I suffer from the loopback problem when working with these servers from my desktop PC. (E.g., I ping one of the dns hostnames and the ping goes to my router instead of the server). I fixed this problem by manually adding the in-home IP addresses and name pairs to my /etc/hosts, and then setting /etc/host.conf to a "hosts, bind" order.
This seems to work for every application on my desktop except for one: the postfix installation on my desktop PC (used for mailing smartctl messages and so forth) cannot communicate with my in-home e-mail server (times out). I checked the logs, and it looks like it is trying to use the IP address from the actual A-RECORD, rather than the address in my hosts file.
So I'm not quite sure what to do. There seems to be a "proxy_interfaces" parameter in main.conf which might be relevant, but I think it only deals with received mail. I'd prefer to have the mail going to that e-mail server, rather than also having to check the spool on my local desktop accounts.
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Sep 25, 2010
is there any HOWTO for configuring Webmin Postfix server with multiple postfix virtual hosts? Seems to be a tough challenge to set it up without any easy manual..
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Mar 20, 2011
I've setup my server by following a ton of goods, and it seems to work ok, but I need to start using my server for email in order to receive orders placed via my website. I've followed this guide - [URL] I followed the steps above, and tested the mail server via telnet, and all seemed to be ok. I tried sending an email via Squirrelmail, from cs@thinclientwarehouse.co.uk TO my working email simon@c1systems.co.uk, but the server returned with the following message:
<simon@c1systems.co.uk>: host mail.c1systems.co.uk[95.128.128.129] said: 550-Verification failed for <cs@localhost.thinclientwarehouse.co.uk> 550-The mail server could not deliver mail to cs@localhost.thinclientwarehouse.co.uk. The account or domain may not exist, they may be blacklisted, or missing the proper dns entries. 550 Sender verify failed (in reply to RCPT TO command)
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Oct 6, 2009
I would like to setup postfix to act as a relay for the outgoing mails of a couple of servers each serving it's own domain.The mails we are talking about are standard administrative emails like user registration, password reset request. The volume of those mails will naturally grow as the site grows. Which for me poses the problem that depending on the growth of the site you will sooner or later hit the quotas imposed by (my otherwise preferred) providers like GMail or smtp.com.
So what I need is a mail relay that will only accept mails from authenticated clients from hosts in its access list and relay their mail without restrictions. Is that possible with postfix? What has to be changed in the config and what are the pitfalls?
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Nov 4, 2009
How can I setup "reverse dns check" option in Postfix ?
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May 8, 2009
It's possible to configure Postfix in order to check spam only for outgoing email?
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May 2, 2011
I'm trying to use ssh-keyscan to get some known_host file population going on, but I have a ton of hosts I want to scan, all with multiple aliases in /etc/hosts. Is there a way to use my current /etc/hosts file to do an ssh-keyscan instead of making a special list of hosts that (from what I've read) ssh-keyscan needs?
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Mar 11, 2010
Here is what i do: make clean make makefiles CCARGS='-DEF_CONFIG_DIR="/opt/product/postfix-2.6.5/etc"
-DEF_COMMAND_DIR="/opt/product/postfix-2.6.5"
-DEF_DAEMON_DIR="/opt/product/postfix-2.6.5/libexec"
-DEF_MAILQ_PATH="/opt/product/postfix-2.6.5/bin/mailq"
-DEF_DATA_DIR="/opt/product/postfix-2.6.5/lib"
-DEF_NEWALIAS_DIR="/opt/product/postfix-2.6.5/bin/newaliases"
[Code]...
make install then i got this error: postfix: fatal: chdir(/usr/libexec/postfix): No such file or directory make: *** [install] Error 1 I don't understand why it's checking the usr/libexec folder for the daemons although I've set the folder to /opt/product/postfix-2.6.5/libexec in the makefile. Here is also the cat of my makedefs.out:
[Code]....
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Jan 26, 2011
Probably an easy (which means stoopid) question...I am trying to reroute a website using my hosts file so that it matches my servers certificate file for testing without effect dns and the live site.When I went to edit my /etc/hosts file it is non-existent. I have, I am assuming in it's place, hosts.allow and hosts.deny. Can anyone explain why I do not have a hosts file?
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Dec 26, 2009
If I need to append a set (or sets) of data to a file(or files) on remote hosts what is the best mechanism by which to do that? My first thought was ssh but the command syntax to append to a remote file isn't clear to me. Can anyone point me in the right direction here?
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Feb 9, 2009
After the syslog facility rolls logs weekly, the Postfix cannot seem to write properly to the mail.log file. What I don't quite understand is that Postfix is still able to write the following error to the log file: ..."status=deferred (temporary failure. Command output: Can't open log file /var/log/mail.log: Permission denied )"It is my understanding that Postfix uses several different processes to write to log files, but I'm confused as to why it is able to write errors to the log but not able to write when sending/receiving mail. After I chmod 777 the mail.log file, Postfix slowly clears the queue and the mails are then received. Everything functions fine for another week, until the logs roll again.
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Jan 27, 2011
Configuring postfix for getting gmail account and we make ssl certificate for this.
File not found ssl
while giving this command:
whereis ssl
ssl:
ssl library file not found ....
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Apr 11, 2011
I am running an application that requires use of my /etc/hosts file. In it, I have my machine name and its LAN ip address. The program creates a service on a specific port, then attempts to connect to it based on the host name. So my hosts file has to be correct.I added the nameservers to resolv.conf and now my application will not run. My guess is that the computer is checking the name servers first, timing out then checking the hosts file.Is there a way I can tell the system to check the hosts file first, then DNS. I thought it should behave that way by default, but it does not appear to.
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May 10, 2010
All clients on the LAN, have to have their /etc/hosts file edited for my server to resolve their hostnames/LAN ip addresses. Both Windows/Mac/Linux. That shouldn't be necessary as all other stanzas are correct. If the hosts file is not ammended my maillog shows connect from unknown rip="my_external_address" when in fact it should say connect from "host" rip=192.168.0.20 Not to sure if it is an iptables issue as I have nothing for this configuration. /etc/hosts file on the server has all required hostnames and ip addresses
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Oct 4, 2010
so i set out to change the default smtp port the server uses because my ISP blocks port 25 and i need the email to work in outlook. this morning i could receive email, but not send it. so i did some research and thought that i needed to edit the master.cf file in /etc/postfix/ by commenting out this line: smtp inet n - n - - smtpd -oand replace it with587 inet n - n - - smtpd (587 being the port i want to use)somewhere along the lines postfix server stopped running and now i cannot get it to start.if i try using SSH it crashes immediately and if i restart it in simple control panel nothing happens
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Feb 25, 2011
I recently moved over user from an old box running postfix(v 2.0.16) over to rhel 6 running postfix (v mail_version = 2.6.6). ive tried to make sure all the files are of correct permissions and that the main.cf file is configured corectly. However there is something wrong as when i run postfix: service postfix server i get no error but when checking the status:service postfix status i get: master dead but pid file exists Looking into /var/log/mailog i find this line being the issue:
Feb 25 16:24:39 puny1 postfix/master[3517]: fatal: fifo_listen: create fifo public/pickup: Permission denied
I gather this is a file permission issue and ive tried to make sure the public folder in /var/spool/postfix is correctly set but still no avail.
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Mar 14, 2011
I am using cent os 5. I want to check the activity of my server log files. Like when the service was up or down,what was the time when the server was shutdown and the time when the server was up and its rest of activities etc etc
Code:
# tail �f /var/log/messages
the above code does not show me the full log status
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Feb 10, 2010
host postfix/qmgr[13020]: warning: connect to transport amavisd-new: No such file or directory
How can I fix this error? I have searched the inet but can't seem to find a solution.
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Aug 17, 2011
Well, as many proxy applications, GNOME Network Proxy Preferences only allow to ignore hosts. What I want to do is exactly the opposite. I only want to use the proxy for few sites. Is it possible to define only the allowed hosts in any way?
PS: I know FoxyProxy add-on for Firefox does this, but 1)I don't use Firefox and 2)I want the proxy settings system wide not only for browser.
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Mar 30, 2011
I need to set up a named server for a class room with 10 imaginary hosts the sub domain managed by this name server is s123456.eca.edu.au where 123456 is to be replaced by your student id. The named server will forward unresolved queries to the dns server.
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Jul 5, 2010
I share a computer with my brother. It runs Lucid Lynx. I want to add an entry to the hosts file that will affect him negatively. Is there a way I can add the entry, without it affecting him, like, is there a user-specific hosts file?
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Jul 22, 2010
I have two Debian 5 servers which running on both the same version of OpenSSH (5.1p1) and OpenSSL (0.9.8g).
One week ago, I set ssh keys on both of them and create the file "authorized_keys". I was able to connect on each server via SSH without password (which is the purpose of ssh keys) but I had an issue with the SSH service and I had to restart one of my server. And since this time, when I try to connect to my other server with the same ssh command, the command ask me to type the password...
This is the result of the ssh command (with the argument -v):
Code:
OpenSSH_5.1p1 Debian-5, OpenSSL 0.9.8g 19 Oct 2007
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to MY_SERVER [1.2.3.4] port 22.
debug1: Connection established.
[Code]....
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Feb 16, 2010
I am trying to add subdomains on ubuntu 9.10 desktop edition and and I am not sure whether I need to add some info.(such as 127.0.0.1 sub1.example.com and so on) to the /etc/hosts file like the windows' windows/system32/drivers/etc/hosts file. I used to use the wamp-server(on Windows 7), I needed to edit 3 files, httpd.conf, httpd-vhosts.conf and hosts. And almost every edit is made in the httpd-vhosts.conf file on wamp-serveriles should be edited? or what else should be done that I didn't mention?
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Jul 13, 2010
tell me a way to password protect the HOSTS file in ubuntu so that when i block certain websites the other person cannot unblock them.
IMP: i donot want the HOSTS file to be protected by 'root' password as the other person knows it.
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Apr 25, 2011
I want to know why when i change the file hosts, fill it with due parameters and reboot the system, the latter unexpectedly change ?
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Aug 3, 2011
I'm configuring Apache to work from several development directories as per these instructions: http://tuxtweaks.com/2009/07/how-to-...-apache-linux/
Got it all to work ok, for a while but then when I reboot the entries I've made in the hosts file dissapear and I can no longer use them.
I'm assuming DHCP reverts the hosts file or something?
What's the 'proper' way to get an entry into a hosts file and have it stay there?
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Jan 31, 2010
Instructions say "Add hostname for the NIC card into /etc/hosts file" do I touch or mkdir it in?
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May 24, 2011
I have some settings within hosts file of my Windows Vista. It helps me to bypass some limitation and get online better. I would like to migrate some settings to openSUSE 11.4.Is there anyone who knows how can I tune my openSUSE?FYI, setting of hosts file is lines of <IP Address> <Spaces OR Tabs> <URL OR Alias>
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Dec 18, 2010
I would like to lock the /etc/hosts file somehow in a way that only someone else can unlock it, possibly using a lock code.I would then give the passcode to someone else.I'm running Ubuntu 10.10.
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Jul 19, 2011
I've trying to get dnsmasq working as a combined dns and dhcp server. It's infuriating so far... In short, the DNS works fine for anything added to /etc/hosts, and the dhcp works fine, but the dhcp is not updating the dns with hostname information from clients.
The outcome of this is that i can only ping a node by hostname if i know it's address, which means setting a static dhcp allocation and putting the hostname into /etc/hosts manually, which is very annoying and kind of defeats the poit of dhcp. There must be a way to get dnsmasq to update the hosts file, surely The clients aren't using fqdn's if that matters, and i think i've tried every combinination of "expand-hosts" and "domain=" following is the dnsmasq config file contents:
domain-needed
bogus-priv
except-interface=tun0
[code]....
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