Server :: CSF Is Blocking Emails To Be Sent Out

Jan 3, 2011

I've a CentOS Box with no control panel.. I used to manage it via SSH. Any way, I've installed CSF/LFD on it.. and it seemed to be working just fine. The only problem I've encountered is that when I start and enable CSF, messages and emails keeps stocked in the mail queue.. I've double checked and made sure needed ports are opined.. But, I still have the problem.

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Programming :: C - For System Calls, Is Blocking Or Non-blocking Default?

Mar 23, 2010

For system calls, is blocking or non-blocking default in C? Simple question, just am not seeing the answer super quickly.

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Programming :: Blocking And Non Blocking TCP Send/recv?

Dec 25, 2010

I have a device that is working on modbus protocol andI have written a small program(with block TCP read method ) to read its registers via modbus program is working very well but except those times that I unplug the Ethernet cable or turning off the modbus gateway during programs this time my program stops on recv system call (if it reach this system call exacly when I unplug Ethernet cable or turning off the modbus gateway during programs work).I changed my source to work in nonblock TCP method, at this time with the same situation my program does not stop/block on recv system call but after pluging back the Ethernet cable or resuming the connectivity situation back it reads data incorrectly .this is my code:Quote:

#define DEBUG
#include <fcntl.h>
#include <string.h>


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Ubuntu :: MUTT - Which Key To Refresh The Emails - Emails Are Got By IMAP ?

May 29, 2010

How to refresh and reload the list of email into MUTT ? Which key?

Additional: how to go to folder SENT of gmail ? and configureation eventually?

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OpenSUSE Network :: Lamp Server To Send Automated Emails Using Cable Providers SMTP Server?

Jun 19, 2010

Somewhere out there there has to be someone that can help me set up my lamp server to send automated emails using my cable providers SMTP server

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Server :: CentOS Mail Server: One Account Cannot Receive Their Emails

Oct 14, 2010

Could it be the IMAP file is corrupt?I have set up mail server on Centos to receive via dovecot.One of my user accounts (A single account out of a hundred)cannot receive their mails.

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Server :: POSTFIX Server New Domain Emails Stuck In Queue

Apr 20, 2010

I am newbie to postfix. I added a new domain to my postfix server in the under mydestinations variable and the relay_domains file. Also, added this domain to my backend exchange server. When I send a test message from the new domain, my messages from that domain appear to be stuck in the "queue active". What does it mean when you are stuck in this queue? Does this mean that my backend email server (exchange 2003) isn't allowing messages from this new domain OR that the POSTFIX server still needs configuring.

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Server :: Blocking Social Networking On The LAN?

Dec 23, 2010

I have a Debian server running at the gateway level on a LAN. This runs squid for creating block lists of websites - for eg. blocking social networking on the LAN. Also uses iptables.

I am able to do a lot of things with squid & iptables, but a few things seem difficult to achieve.

1) If I block, people can still access because squid doesn't go through https traffic by default. However, if the users set the gateway IP address as proxy on their web browser, then https is also blocked. So I can do one thing - using iptables drop all outgoing 443 traffic, so that people are forced to set proxy on their browser in order to browse any HTTPS traffic. However, is there a better solution for this.

2) As the number of blocked urls increase in squid, I am planning to integrate squidguard. However, the good squidguard lists are not free for commercial use. Anyone knows of a good squidguard list which is free.

3) Block yahoo messenger, gtalk etc. There are so many ports on which these Instant Messenger softwares work. You need to drop lots of outgoing ports in iptables. However, new ports get added, so you have to keep adding them. And even if your list of ports is current, people can still use the web version of gtalk etc.

4) Blocking P2P. Haven't been able to figure out how to do this till now.

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Server :: IP Blocking - Block ALL Connections Except For Certain Ones

Feb 8, 2011

Ok so, buddy of mine has his ssh server setup and upon checking his logs he sees a ton of failed attempts. Now obviously these are people that are scanning him and trying to brute force him. So is there a way to block them? We know you can block each IP but is there a way to block ALL connections except for certain ones, such as his and mine? Maybe a couple others.

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Server :: Skype Blocking In Squid?

Jun 6, 2011

I configured squid in oracle enterprise linux 5.I want to block skype access.i configured the following to block skype.but it is not blocking.acl skype_blocking urlpath_regex [0-9]+.[0-9]+.[0-9]+.[0-9]+ http_access deny skype_blocking

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General :: Blocking Countries From Accessing Server?

Jun 3, 2010

How can I block certain countries from accessing my server in any capacity? Is this possible? What do I need to add to my /etc/hosts.deny for this?

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Security :: Blocking A Specific IP Address From Server?

May 8, 2010

I would like to COMPLETELY block a specific IP address using iptables. I found this one:


iptables -A INPUT -p tcp -s -j REJECT --reject-with tcp-reset

Will this work? How do I undo the changes later?

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Server :: Blocking IP Address For Fake Users?

Feb 4, 2011

How to block an ip address from mikrotik so that when a fake user use this ip he doesn't get internet but in the mean time real user gets internet. Real user will not harm if fake user trying to access.

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Server :: Blocking Bad Bots & HTACCESS Optimization?

Nov 7, 2010

My Pastebin for .HTACCESSIf you can offer any tips on improvements..but the main reason: I cannot get the bots to stop showing up.Esp the first one in the list.I need to block these two specifically

Mozilla/5.0 (Windows; U; Windows NT 6.1; en-GB; rv: Gecko/20100722 Firefox/3.6.8


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Server :: Blocking Mac Based Address In Squid?

Apr 6, 2011

I need to block mac address in my network then i foolowed as below acl's but am getting output as follows I tried as in /etc/squid/squid.conf acl block arp aa:aa:yy:yy:xx:xx http_access deny block but it give me error as like: - (This is the output of # squid -k parse) aclParseAclLine: Invalid ACL type 'arp' FATAL: Bungled squid.conf line 1234: acl block arp aa:aa:yy:yy:xx:xx squid Cache (Version 2.5.STABLE6): Terminated abnormally.

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Server :: MailScanner Blocking Docx Files?

Sep 17, 2010

My MailScanner running on CentOs is blocking docx files, saying "The original e-mail attachment "****.docx" is on the list of unacceptable attachments for this site and has been replaced by this warning message.

I've tried adding it the list of allowed files:


allow .docx$ - -

but it still blocks them.

I've also tried manually coping the message file from the /var/spool/MailScanner quarantine/ directory into /var/spool/postfix/incoming

but this did not result in the mail being delivered.

I desperately need these mails released, and docx files to be allowed unconditionally. Anyone know why the above isn't working? Failing that, can all file blocking be turned off? I'd rather have virus relayed than legitimate mails blocked.

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Server :: Video Streaming Acl Also Blocking Exe - Rar And Other Downloads ?

Aug 22, 2009

I have these ACLS for video streaming like ..... & onilne tv channles. But they are also blocking downloading exe,rar,and other software connectivity like TeamViewer. What acl are bsically blocking my downloading of exes and rar files and teamviewr connectivity .

acl WMP browser Windows-Media-Player/*

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Server :: Website Blocking Through SQUID Proxy?

Aug 4, 2010

i am using squid proxy server to block some websites in my i was doing one testing that is, when i blocked Google. gmail automatically gets there any method by which i could block google but gmail access is

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Server :: Can't See Emails In Inbox

Aug 27, 2010

I have Dovecot up and running however Thunderbird nor Evolution can see mail in the users inbox. Getting no errors from them either thunderbird nor Evolution.On the server (Cento 5.3) the email is in /var/spool/mail/ username. Sending a receiving email on the server itself whats fine using the mail commands. Is their a setting in Dovecot I'm over looking?

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Ubuntu Networking :: Server Blocking SSH From Work Network

Feb 2, 2010

I have an ubuntu 8.04 dedicated server running openssh which I am having problems with.

The server is based in England yet I am currently working from Thailand. Slow speeds and timeouts I am used to but it is now over 24hr since I have managed to SSH the server (from here).

I just tried remote desktop on my PC back in the UK and this connected straight away through both SSH and SCP.

Thinking that it may be the IP being blocked from my works network I switched off wifi on my phone and tried to connect over the data network a few times with no luck.

Another strange problem is that when we got the server it was locked into a chroot jail which SSH(22) always leads into. After accessing SSH on port 22 I have to run a break script to gain root access. The sshd_config file says that the server is listening on port 57 yet I have never been able to access this.

> netstat -a | grep ssh
tcp6 0 0 [::]:ssh [::]:* LISTEN
> iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination


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Server :: Hot To Block Gmail Without Blocking Https In SQUID?

Apr 8, 2010

My Problem is: I want to stop gmail access without blocking https. Yes in my squid proxy normal [URL].. is not accessible. But gmail recently started https service by which user can still get access to gmail. I DONT WANT TO STOP https CAUSE ITS BEING USING BY OTHER PROGRAMS.

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Server :: Putting IP Blocking In A Separate Conf File?

Jan 1, 2010

Running Red Hat (not sure of the build atm) and I need to be able to put all of the IP blocking in a separate file. It will eventually be uploaded to a large number of hosting accounts, and modified from time to it isn't feasible to modify that many httpd.conf files each time we need to add an IP to be blocked. In httpd.conf I can add the "Deny from" line to the following directive and blocks it just fine:


<Directory "/var/www/html">
# Possible values for the Options directive are "None", "All",
# or any combination of:
# Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews


There is an include to pick up all *conf files in ../conf.d, and everything else in there is working just fine. I created a file called robots.conf; it currently has a set of mod_rewrite rules which work. So I added this to that file:


<Directory "/var/www/html">
Order allow,deny
Allow from all
Deny from 123.456.789.098

It is not blocking access from the IP with it in there.I've done all of the usual things; restarted Apache, cleared browser cache etc. I can also block it using that same directive in a local .htaccess.

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Server :: Sendmail DNSBL Blocking Authenticating Users?

Feb 2, 2010

I have a problem with sendmail. I am using the dnsbl, and it is doing a wonderful job of blocking incoming spam from open relays. But it is blocking my users who are on a dynamic ip range from any isp remotely. They should be able to authenticate and send messages no matter where they are as long as they authenticate right? I just want to use the blacklist to block incoming mail to my server that is being distributed to our email addresses.

I want to block people that are hosting mail servers and sending mail to my domain from isp sub-nets. But I don't want to block my users that are sitting on isp subnets using their mail client to authenticate over smtp and send an email from my mail servers.

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Server :: Enable Incoming Emails

Mar 3, 2011

I use php to send newsletter via sendmail.outgoing emails work as needed.I defined a .forward file to get responses in my regular email account.If I use mailx to send emails from root account to my own account, it gets forwarded as needed.If I try to send from outside the box to the email is not received in the box and the sender does not receive an error message.

I am sure I missed something.How do I enable incoming emails?

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Server :: How To See The Subject Of Emails Queued

Jan 22, 2010

I've a mailserver based on postfix. I'm queueing all the emails that have to be sent. After that I'm managing the queue with the output of mailq.

But in this way I'm just able to have this details of the queued mails: sender, receiver, size, time. There is a way to see also the subject of that emails?

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Server :: Postfix Cannot Receive Emails

Jul 30, 2010

I have lenny with postfix, countier-imap, squirrelmail installed i can send emails but i can not receive any emails.

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Server :: Postfix Does Not Send Emails?

Feb 8, 2011

I'm stuck with postfix. It cannot send emails and I cannot find out why! smtpPort 25/tcp is open. I can telnet localhost with 25, but not the localhosts IP( Sendmail is OFF. Here is the file!

# See /usr/share/postfix/ for a commented, more complete version
# Debian specific: Specifying a file name will cause the first
# line of that file to be used as the name. The Debian default


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Server :: Script For Reading Emails?

Feb 10, 2011

In linux is there a way to read a mail from particular mail id and the mail content should be written to text it possible, if possible can any anyone share the idea behind that.

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CentOS 5 Server :: All Emails Go To One Address?

Apr 6, 2011

I am working for the first time on a dedicated server with CentOS. I have sendmail and postifx installed and I realized all the emails send by the server are redirected to my own private address.

For example if I want to send an email to "", I will receive it in my box (ex "")... I also receive in my box the logwatch which should be send to

That is very strange and I really don't understand what does that.

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Networking :: Unwanted Blocking Ip Address And Session Log Out In Ubuntu 10.04 Server

Jun 29, 2011

I have UBUNTU server 10.04 LTS with 3 NIC "eth0" local and eth1,2 as internet connection and it acts as firewall, http proxy and samba file server ,I installed Zentyal panel manager for my server for easier management I did not configure any specific rule for my firewall but I have some problem with my clients who wants to connect to my server as gateway or as file server even my self experienced these problems too. these problems are as follow:

1. some time for a few minutes (maximum 10 minutes) my server block some of my clients to access it or internet but just for minutes but it is very annoying.
2. all of my clients those who login to an https servers or login to their mail or those who has some software like team viewer say that they are logging out from their session randomly I mean some of them logging out from their mail(yahoomail or googlemail ) or disconnecting from teamviewer connection or as I saw team viewer disconnecting for a few seconds and then comes back again. but I did not set any thing in my firewall or other services. this is my complete iptable rules:

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