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  • What prevents an attack on Postfix through its named pipes?

    - by Met?Ed
    What prevents an attack on Postfix through its named pipes by writing bogus data to them? I see on my system that they permit write access to other. I wonder if that opens Postfix to DoS or some other form of attack. prw--w--w- 1 postfix postdrop 0 Nov 28 21:13 /var/spool/postfix/public/pickup prw--w--w- 1 postfix postdrop 0 Nov 28 21:13 /var/spool/postfix/public/qmgr I reviewed the pickup(8) man page, and searched here and elsewhere, but failed to turn up any answers.

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  • Why does Exim puts emails on hold if there are frozen messages in the queue?

    - by user51932
    Hi, I've a CentOS with CPanel server working as a SMTP server, which currently uses 20 different hostnames and IP addresses to deliver email for an email newsletter service. However, it's extremely slow in sending emails. It's sending like 10 emails per minute, which I check by running the "exim -bpc" command. What could be affecting this? One thing I'm supposing, is that there are frozen messages in the queue, which are slowing down the sending until they're sent out, and are putting new messages on hold. What are the most common reasons a message can get frozen? Also, would it be more efficient to use 20 different small VPSs to send out email rather than use one large VPS with the 20 different hostnames and IPs in it?

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  • Availability of big files on multiple servers

    - by Imises
    I have to handle many (1'000 - 30'000) big files ranging from 200MB up to 2GB. The demand for these files is variable (0 - 300 downloads / file). This is why a single file must saved on 2 or more servers. My servers are placed in different datacenters (France), with different size HDDs (750GB to 4TB). Currently I share the files using PHP and ncftpget / ncftpput, but it's very slow. I need a solution to handle balancing these files across 7+ servers.

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  • How to close window/app when i cant see it? ubuntu

    - by tm1rbrt
    Im running ubuntu. I just tried to play supertux but my LCD didnt support the resolution and all i got was a blank screen and music playing. I tried to close it and go back to the desktop by pressing ctrl + z but that didnt work so i had to hard reset my computer! In future what should i press when this happens?

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  • What do these abbreviations stand for ?

    - by Luc M
    Some directories are easy to understand the meaning /usr /bin ... But for the next ones, I have no idea. /etc /opt opt for optionnal ? etc for electronic t...... configuration (no idea for t) I would like to know what these abbreviations are meaning

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  • Redirect all ports to my server in a simple way

    - by Dorian
    I have a server with SSH access (on port 22 and 443). My ISP block everything except ports 80 and 443. I there a simple way to make everything go to my server (via SSH) then return the response via the same SSH connection, but in a way I can use all the ports in my client. Like : Me ? SSH connection ? My server ? request ? Server ? My server ? Me It's like a VPN but I don't have any port available for a VPN (443 is already taken by SSH).

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  • Linux 3.7 sort en version stable : support de multiples plateformes ARM, améliorations de Btrfs, Ext4, TCP Fast Open et IPv6

    Linux 3.7 sort en version stable support de multiples plateformes ARM, améliorations de Btrfs, Ext4, TCP Fast Open et IPv6 Près de deux mois après la sortie du noyau Linux 3.6, Linus Torvalds, annonce la publication de la version stable de Linux 3.7, avec un nombre important de nouvelles fonctionnalités. La nouveauté vedette de cette mouture est sans aucun doute la proposition d'une version unique du Kernel capable de prendre en charge plusieurs architectures ARM. Bien que le support de toutes les plateformes ARM du marché ne soit pas complet, Linux 3.7 est compatible avec les plateformes populaires comme les processeurs Calxeda's Higbank ARM utilisés dans les serveurs Moo...

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  • merge pieces of file together

    - by veilig
    I have a directory tree of files I need to loop through and reformat the lines. can I do this with sed with some combination of find? for each file, I'll need to adjust the text in the file from ... * @category Foo * @package Bar ... into just this (Remove the @category line, but prepend the value to the package annotation value) ... * @package Foo/Bar ... what is the most efficient way of doing this? its a few hundred files that will be modified.

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  • How do I get openssh to save my ssh identity permanently in Xfce?

    - by Alliswell
    How do I change it to save my identity permanently using Xfce? During my login session after I have entered: $ ssh-add Then identity is saved and I can connect via ssh without getting the dreaded: Enter passphrase for key However, once I logout and login back-in I get the following when running: $ ssh-add -L The agent has no identities. $ ssh <hostname> Enter passphrase for key '/home/user/.ssh/id_rsa': Stackoverflow has the following solution, yet I do not understand the reference to in the config file: IdentityFile ~/.ssh/id_rsa_buhlServer Specifically I do not understand what I would put on the identity file. Would I put the above word for word? Or just add my file: IdentityFile ~/.ssh/id_rsa StackOverflow solution

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  • Tcp Port Open by Unknown Service

    - by Singularity
    Running openSUSE 11.2 x86_64. Here's what a nmap of my IP provides: PORT STATE SERVICE 23/tcp open telnet 80/tcp open http 2800/tcp open unknown 8008/tcp open http I would like to know How to view What service is causing Port 2800 to be opened? A few search engine results led me to believe that it is supposedly a port opened by a Trojan called "Theef". If it is indeed a Trojan, what can be done to weed it out? Is my desktop's security compromised?

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  • Key is not detected in xev neither showkey -k in Ubuntu 10.04 in a Virtualbox VM.

    - by Somebody still uses you MS-DOS
    My question mark key in my keyboard isn't working. ("?"). I've tried to use xev and showkey -k to try to identify at least it's code and manually use xmodmap to mao this key. Unfortunately, the keys aren't being detected in neither utilities. I'm using Ubuntu 10.04 in a Virtual Machine, and my Kernel is 2.6.32-22-generic. What can this be? It's not a special multimedia key, it's a simple one. I would like to understand what exactly is happening so at least I can try to better debug this issue.

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  • Mail Server with Google Apps

    - by Daniel Fukuda
    Hello, Is there any mail server that has a feature to download (POP3) emails from another mail server like Google Apps (Gmail for your own domain), store it and then allow to users to download (POP3/IMAP) emails to their own mail client like Outlook/Live Mail? So I want it to become like a "middle mail server". I hope you guys understand it. My main reason to do so is that Google Apps got limited space for each mailbox and I also want to have emails in one space so its easy to archive and backup.

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  • Use puppet to make changes to ip route and sysctl

    - by Quintin Par
    I have two changes to ip route & sysctl that disable tcp slow start. Here’s how I do it ip route show Make a note of the line starting with default. Pick up the IP from the default line and run sudo ip route change default via $ip_address dev eth0 initcwnd 12 sudo sysctl -w net.ipv4.tcp_slow_start_after_idle=0 How can I create a puppet script out of this? One that can be deployed to many machines of the same type – CentOS 6 Edit: Added bounty to get a working example for sudo ip route change default via $ip_address dev eth0 initcwnd 12

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  • How do I create yum repo file?

    - by max
    I know there is a previously asked question, but I still have some doubts so asking again. How do I create a yum repo file? I know that in the /etc/yum.repos.d/ I have to create .repo file. Below is the pattern: 1 [name ] 2 name= 3 baseurl= 4 enabled=1 5 gpgcheck=1 6 gpgkey= Here in the baseurl which link should I give? I'm fully confused about this. How do I get that baseurl link? Can anyone please explain to me clearly? I am using CentOS 6.2.

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  • Inbox lock for exclusive access [duplicate]

    - by user212051
    This question already has an answer here: Dovecot pop3: Disconnected for inactivity 2 answers -I found server logged into mailbox on my smtp server -This server released connection for inactivity after 10 minutes. -in the 10 minutes between logged in & disconnected for inactivity, 3 attempts to send message from 3 different clients to this mailbox failed due to unable to lock for exclusive access: Resource temporarily unavailable -after disconnection the 3 messages reached mailbox good. I tried to simulate the process and lock test mailbox but I couldn't, I was aiming to understand who can lock ? who has exclusive access ? and why only client server can lock ? and how to solve this ?

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  • Ubuntu USB flash boot drive gets spontaneous "Unhandled sense code" error and causes drive to switch to Write protected

    - by Steve
    What happens is that the system runs fine for several days or even a week and then suddenly the root file-system / goes read-only. Looking at the syslog it shows that there was an 'Unhandled sense code'. This is under Ubuntu 10.04 but I saw the same thing with Ubuntu 9 with different flash media. /dev/sdg1 on / type ext4 (rw,errors=remount-ro) Jun 26 08:50:04 host1 kernel: [926247.565090] sd 5:0:0:0: [sda] Unhandled sense code Jun 26 08:50:04 host1 kernel: [926247.565094] sd 5:0:0:0: [sda] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE Jun 26 08:50:04 host1 kernel: [926247.565098] sd 5:0:0:0: [sda] Sense Key : Data Protect [current] Jun 26 08:50:04 host1 kernel: [926247.565103] sd 5:0:0:0: [sda] Add. Sense: Write protected Jun 26 08:50:04 host1 kernel: [926247.565108] sd 5:0:0:0: [sda] CDB: Write(10): 2a 00 00 46 29 18 00 00 08 00 Jun 26 08:50:04 host1 kernel: [926247.565117] end_request: I/O error, dev sda, sector 4598040 Jun 26 08:50:04 host1 kernel: [926247.569788] Buffer I/O error on device sda1, logical block 574499 Jun 26 08:50:04 host1 kernel: [926247.574677] lost page write due to I/O error on sda1

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  • Preventing an Apache 2 Server from Logging Sensitive Data

    - by jstr
    Apache 2 by default logs the entire request URI including query string of every request. What is a straight forward way to prevent an Apache 2 web server from logging sensitive data, for example passwords, credit card numbers, etc., but still log the rest of the request? I would like to log all log-in attempts including the attempted username as Apache does by default, and prevent Apache from logging the password directly. I have looked through the Apache 2 documentation and there doesn't appear to be an easy way to do this other than completely preventing logging of these requests (using SetEnvIf). How can I accomplish this?

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  • Can I use squid (or anything) to do this?

    - by user269334
    I have a really crappy VPS, and a really good computer at my office (with a really good internet connection), but behind a NAT. Is it possible to expose my good computer by doing this: 1. The good computer connects to the VPS (and keeps the connection alive) 2. The users connects to the VPS, and sends http(s) requests to the VPS. 3. The VPS just passes that http(s) requests to the good computer (including some identifications, so the servers can distinguish connections) 4. The good computer passes that http(s) response to the VPS 5. In turn, the VPS receives the http(s) response, and passes back to the client. Is it possible to do this? (btw, the VPS and the good computer are located in different countries) And also, is this "reverse proxy"? I heard that reverse proxy is for protecting the internal network by putting a middle server. And will this affect SSL configurations? (or make SSL impossible?) I'm intending to run nginx on the good computer. Thanks in advance : )

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  • Soap client call has slow performance

    - by Alon_A
    OS is Centos 6.2 with PHP 5.3.15. We have a Facebook application that is using PHP soap web services. We sometimes experince slow preformance when connecting to these services, but we cant understand what exacly is causing the problem. We've try to analyse the behavior using the profiling tool Kcachgrind. Here is a call graph from the index.php page that took 21 seconds to load. You can clearly see that calling the soap client is the bottle neck. I've also noticed that exactly before the page finishes to load, this file is being created in our serve's /tmp folder: wsdl-apache-d1032d85dfd16c0d91a6b70facc70e43 These are the permission of /tmp drwxrwxrwt 6 root root 40960 Aug 30 10:39 tmp I know its not the most specific question, but if any one had similar performance issues with soap client, We would love some ideas about what can cause this kind of performance problem, what can we do to investigate more accurately or how to overcome the problem ? Thanks.

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  • What's the best way to forward traffic on a specific port to another machine?

    - by Ankit
    The setup I have is this: [client01] <-A-> [server01] <-B-> [server02] client01 can access port 9300 on server01 (connection A). server01 can access port 9300 on server02 (connection B). What's the best way to make all traffic on port 9300 to server01 go to port 9300 on server02? I can successfully do this with an ssh tunnel from client01 to server01 to server02, but I don't want to have to run ssh on client01. When I ssh from server01 to server02 forwarding port 9300 (ssh -g -L9300:localhost:9300 server02 on server01), it doesn't work -- am I using the wrong command?

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  • Is it possible to have environment variables in the path of the working directory : PS1?

    - by mthpvg
    I am on Lubuntu and I am using bash. My PS1 (in .bashrc) is : PS1="\w> " I like it because I need to paste the working directory all the time. The problem is that the path is always very long and since I use terminator I only have half of my screen's width available to display it... it is ugly and annoying. My command prompt looks like that : /this/is/a/very/long/path/that/i/want/to/make/shorter > I'd like to set in my environment variables : $tiavl=/this/is/a/very/long And then I'll get : $tiavl/path/that/i/want/to/make/shorter > The goal is to have something shorter in the command prompt but I still want to be able to copy paste it and do : cd $tiavl/path/that/i/want/to/make/shorter It is a bit like with $HOME : ~/path/that/i/want/to/make/shorter > I know where I am and I can copy paste the ~. Thanks.

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  • Configure firewalld for OpenVPN (server-bridge) in Fedora 20

    - by rsc1975
    I've installed an OpenVPN server (server-bridge) on Fedora 20, but I cannot get it to work. I'm almost sure that It's a firewall issue. I'm trying to connect from an OSX client, but I can connect (just connect to VPN server, without access to anything) before the bridge is configured in server, however once I configure the bridge interface (using this script), then I cannot connect anymore. I've configured it as server-bridge, following these HOW-TOs from Fedora and OpenVPN Ethernet-Bridge. The firewall config is explained using iptables: iptables -A INPUT -i tap0 -j ACCEPT iptables -A INPUT -i br0 -j ACCEPT iptables -A FORWARD -i br0 -j ACCEPT However, in Fedora 20, by default, It's installed firewalld, so, Can anyone tell me the equivalent commands using firewall-cmd ? I read the firewalld guide, but It's not clear to me how to achieve it (I'm a developer, no SysAdmin). I know that I can install iptables, but I want it to work with firewalld.

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