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• iptables: built-in INPUT chain in nat table?

  - by ughmandaem

  I have a Gentoo Linux system running linux 2.6.38-rc8. I also have a machine running Ubuntu with linux 2.6.35-27. I also have a virtual machine running Debian Unstable with linux 2.6.37-2. On the Gentoo and Debian systems I have an INPUT chain built into my nat table in addition to PREROUTING, OUTPUT, and POSTROUTING. On Ubuntu, I only have PREROUTING, OUTPUT, and POSTROUTING. I am able to use this INPUT chain to use SNAT to modify the source of a packet that is destined to the local machine (imagine simulating an incoming spoofed IP to a local application or just to test a virtual host configuration). This is possible with 2 firewall rules on Gentoo and Debian but seemingly not so on Ubuntu. I looked around for documentation on changes to the SNAT target and the INPUT chain of the nat table and I couldn't find anything. Does anyone know if this is a configuration issue or is it something that was just added in more recent versions of linux?

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• Why is Nginx ignoring the access_log directive when post_action is specified?

  - by Chris

  Hi, in the location below nginx writes a custom download log. Everything works fine except when there is a post_action directive. I seems that nginx skips the access_log directive. Here is the config: location /download_intern/ { internal; if ($uri ~* ^/download_intern/([0-9]+)/) { set $transferID $1; set $server $arg_ip; set $url $arg_url; proxy_pass http://$server:80/$url; break; } log_format download '$remote_addr [$time_local] $upstream_cache_status "$scheme://$host$request_uri" $status [$transferID] $body_bytes_sent'; access_log /opt/nginx/logs/server.download_log download; # without this line the download log file is being written post_action /done; } location /done { internal; # log the transfer on the main server proxy_pass http://xxx.xxx.xxx.xxx:80/download_end/?tid=$transferID; }

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• send email from linux

  - by mustapha georges

  I built a Linux server (CentOS). I have an application that sends email using the Zemd_Mail class which uses SMTP. The application configuration asks for Host Port Return path (Y/N) but does not provide explanation. What do I need to set this up? Can I use a gmail account to forward the mail? When I try to send mail now, it does not arrive. I get this log in /var/log/maillog Nov 7 21:50:26 localhost sendmail[8328]: qA82oQEP008328: to==?utf-8?B?bWFydGluLmN5dHJ5bmJhdW0=?= <[email protected]>, ctladdr=apache (48/48), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30467, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (qA82oQHr008329 Message accepted for delivery)

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• postfix and chdir domain.com/admin/ failed

  - by senzacionale

  root@ubuntu-server:/var/log# telnet localhost 110 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. +OK Hello there. user [email protected] +OK Password required. pass MyPasswd -ERR chdir domain.com/admin/ failed Connection closed by foreign host. and mail.log Apr 24 12:36:41 ubuntu-server pop3d: Connection, ip=[::ffff:127.0.0.1] Apr 24 12:36:58 ubuntu-server pop3d: chdir domain.com/admin/: No such file or directory what can i do? how to set up this directories? MX records are set, domain is set,...

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• PHP Mail Relay via Remote smtp Server

  - by Toqeer

  We have a php application running on Linux which sends emails to there users. Currently its setup like php.ini is configured to send via local sendmail server but we have separate mail server for our organization for this domain. I want to send the php application emails via that remote smtp server so these emails can have the correct SPF records and sign via DKIM. But I could not see such option in php.ini to specify the remote host address to forward emails to that, its for windows only. I saw some post which suggest phpMailer but I could not find how to configure that so all our php application could send via our remote SMTP.

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• Set global handling for PHP scripts in NGINX + PHP-FPM

  - by Radio

  I have to define fastcgi_pass for every virtual host. How do I define it global-wise? server { listen 80; server_name www.domain.tld; location / { root /home/user/www.domain.tld; index index.html index.php; } location ~ \.php$ { fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /home/user/domain.tld$fastcgi_script_name; include fastcgi_params; } }

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• How to manage a home-grown YUM package repo?

  - by TomOnTime

  There are plenty of websites that explain how to manage a mirror of YUM repos. I want to run a repo for my home-grown packages. Is there a good way to manage such repos? What I need to do: Manage 3 repos: unstable, testing, stable Self-service functions that let users add/remove/promote packages (promote means moving a package unstable?testing or testing-stable). ACLs that control which users/groups may add/remove/promote packages. Automatically re-sign packages as they move repo to repo (since the GPG key for "stable" should be different than "unstable") Automatically run "createrepo" to update repodata when needed. Suggestions?

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• How can I set up VLANs in a way that won't put me at risk for VLAN hopping?

  - by hobodave

  We're planning to migrate our production network from a VLAN-less configuration to a tagged VLAN (802.1q) configuration. This diagram summarizes the planned configuration: One significant detail is that a large portion of these hosts will actually be VMs on a single bare-metal machine. In fact, the only physical machines will be DB01, DB02, the firewalls and the switches. All other machines will be virtualized on a single host. One concern that has been is that this approach is complicated (overcomplicated implied), and that the VLANs are only providing an illusion of security, because "VLAN hopping is easy". Is this a valid concern, given that multiple VLANs will be used for a single physical switch port due to virtualization? How would I setup my VLANs appropriately to prevent this risk? Also, I've heard that VMWare ESX has something called "virtual switches". Is this unique to the VMWare hypervisor? If not, is it available with KVM (my planned hypervisor of choice)?. How does that come into play?

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• Problems executing check_mysql plugin

  - by Brian

  I'm attempting to test out the check_mysql plugin for Nagios using the command line. It works great when I'm just checking localhost but when I try to specify a different server (using the -H argument) I keep getting the following error message: CRITICAL - Unable to connect to mysql://nagios_user@{remoteServerHostname}/ - Access denied for user 'nagios_user'@'{localServerHostName}' (using password: YES) It looks like it's trying to connect to the database using the localhost server even though I've specified a different host name. I've already set up this user on the remote database and they have correct permissions. I'm just trying to figure out why the script keeps inserting the localhost server name instead of the remote one.

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• DNS protocol message example

  - by virtual-lab

  hello there, I am trying to figure out how to send out DNS messages from an application socket adapter to a DNSBL. I spent the last two days understanding the basics, including experimenting with WireShark to catch an example of message exchanged. Now I would like to query the DNS without using dig or host command (I'm using Ubuntu); how can I perform this action at low level, without the help of these tools in wrapping the request in a proper DNS message format? How the message should be post it? Hex or String? Thanks in advance for any help. Regards Alessandro Ilardo

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• capture nimbuzz traffic

  - by lurscher

  I need to capture all the traffic, specially during login, between nimbuzz pc client and nimbuzz server. The reason is that i need to debug outgoing packets at login that mark the user visibility status in order to reproduce them in a in-house XMPP client application I've tried doing this with wireshark, but i seem to be pretty helpless with this tool. Also, the packets i've been able to see are all before the SASL negotiation happens, after that, i cannot see the xml packets being exchanged any help for how to achieve this task is greatly appreciated (preferably on Windows, since there is no nimbuzz client for linux, in any case i can install one in a VM and monitor the traffic between the VM instance in the linux host)

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• Website hosted on IIS is not accessbile

  - by Tola Odejayi

  I have two sites set up in IIS on a remote machine RM; one on regular port 80, and the other on port 5773. From my local machine LM, I can access the site on 80, but I cannot access the one on 5773; I get a status code of 502 and an error code of 10060 (A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond) when I try to do this. I can access the 5773 site via IIS when I am logged into RM (i.e. by right clicking on a page on the site and going 'Browse'). I can also access pages on the 5773 site via a browser, again when I am logged into RM. I just can't do the same via a browser when I am logged into LM. I have ensured that port 5773 is open for outgoing traffic on LM. Could the problem be that I also need to ensure that port 5773 is open for inbound traffic on RM?

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• My datacenter is unable to add PTR/rDNS record, then how can I prevent the mail outgoing from going to spam folder?

  - by gilzero

  I am having problem that mail sent out from my server all goes to recipient's spam folder. I am running Drupal sites on Linux server. CentOS w/ cPanel. Our users cannot receive email as the mail went to the spam folder. (such as registration email, contact form email) I was advised that I need to have PTR/rDNS record added for my host. I then contact my datacenter to add PTR/rDNS thing, unfortunately, the datacenter said they are unable to do it. So what can I do? Any other ways I can fix the problem? Thank you!

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• trying to understand how Linux /etc/hosts file works with local and external IP addresses

  - by gkdsp

  Let's say I have a Linux server with an external IP of 123.456.789.012 and a local IP of 192.168.0.1. If it's /etc/hosts file looks like, for example, 123.456.789.012 host2.mydomain.com 192.168.0.1 host2.mydomain.com When an application on the server generates traffic to send using host2.mydomain.com, how does the server know whether to use the local or external IP address (since the same host name shows two IP addresses)? Or, does it need something additional than what I've presented here to decide this? Or, does it just sent it out as host2.mydomain.com and let the receiving end deal with it (if so, how to make sure traffic intended for local network indeed goes to local network)?

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• Vmware Workstation Development Server on Laptop

  - by Koobz

  I'm running an Ubuntu guest OS on my Windows 7 laptop. Currently, I have it set up for bridged networking. The guest is os is configured for a static ip of 192.168.1.115, which depending on the network I'm connected to, may not be available. When I want to view my development work I hit that up in my web browser. I'm really looking for the following scenario: 1) My guest OS ip address stays constant. 2) I can access my guest os even if I don't have an internet connection, or a lan/router. 3) I can share files with my guest/host. How does one accomplish this using VMware Workstation?

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• Locking down a server for shared internet hosting.

  - by Wil

  Basically I control several servers and I only host either static websites or scripts which I have designed, so I trust them up to a point. However, I have a few customers who want to start using scripts such as Wordpress or many others - and they want full control over their account. I have started to do the basics - like on php.ini, I have locked it down and restricted commands such as proc, however, there is obviously a lot more I can do. right now, using NTFS permissions, I am trying to lock down the server by running Application Pools and individual sites in their own user, however I feel like I am hitting brick walls... (My old question on Server Fault). At the moment, the only route I can think of is either to implement an off the shelf control panel - which will be expensive and quite frankly, over the top, or look at the Microsoft guide - which is really for an entire infrastructure, not for someone who just wants to lock down a few servers. Does anyone have any guides that can put me on the correct path?

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• OpenBSD has open ports in default installation

  - by celil

  I have been considering replacing Ubuntu with OpenBSD to improve the security on my local server. I need to have ssh access to it, and I also need it to serve static web content - so the only ports I need open are 22 and 80. However, when I scan my server for open ports after installing OpenBSD 4.8, and enabling ssh and http at /etc/rc.conf httpd_flags="" sshd_flags="" I discovered that it had several other open ports: Port Scan has started… Port Scanning host: 192.168.56.102 Open TCP Port: 13 daytime Open TCP Port: 22 ssh Open TCP Port: 37 time Open TCP Port: 80 http Open TCP Port: 113 ident ssh (22) and http (80) should be open as I enabled httpd and sshd, but why are the other ports open, and should I worry about them creating additional security vulnerabilities? Should they be open in a default installation?

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• ubuntu qcow2 image for local usage

  - by aisbaa

  I'm using kvm and I would like to run ubuntu server on it. My goal is to run db2 database instance for development. Is there ready to use ubuntu qcow2 images online for such purpose? Or should I install it from live cd? I've found this instruction UEC/Images, but at launch I get: $ kvm -fda ${floppy} -drive if=virtio,file=./disk.img -boot a ... Nothing to boot: No such file or directory (http://ipxe.org/...) No more network devices No bootable device. Solution: I havent found pre-installed ubuntu virtual machine image online, so solution is to install it by your self.

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• Apache on Mac Mavericks issue

  - by Michael

  Trying to run Apache so that I can create a testing server on my mac.When I start apache it starts, but it doesn't run (no connection to local host. Ill upload the unix,you'll see that after starting there is no processes, and I did a check to show you what was running on my port 80... I don't entirely know that means. Michaels-MacBook-Pro-3:~ michaelramos$ sudo apachectl start Michaels-MacBook-Pro-3:~ michaelramos$ ps aux | grep httpd michaelramos 348 0.0 0.0 2442000 624 s000 S+ 8:51AM 0:00.00 grep httpd Michaels-MacBook-Pro-3:~ michaelramos$ sudo apachectl start org.apache.httpd: Already loaded Michaels-MacBook-Pro-3:~ michaelramos$ sudo lsof -i ':80' COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME ocspd 96 root 18u IPv4 0x8402f926599c58df 0t0 TCP dhcp-92-67.radford.edu:49267->108.162.232.196:http (ESTABLISHED) ocspd 96 root 20u IPv4 0x8402f926599c58df 0t0 TCP dhcp-92-67.radford.edu:49267->108.162.232.196:http (ESTABLISHED) ocspd 96 root 21u IPv4 0x8402f926599c50f7 0t0 TCP dhcp-92-67.radford.edu:49268->108.162.232.206:http (ESTABLISHED) ocspd 96 root 23u IPv4 0x8402f926599c50f7 0t0 TCP dhcp-92-67.radford.edu:49268->108.162.232.206:http (ESTABLISHED)

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• Is there any danger in disabling windows firewall on a azure worker role?

  - by NullReference

  I'm trying to troubleshoot a bug on our Azure worker role where we occasionally get the error "Unable to read data from the transport connection: An established connection was aborted by the software in your host machine". This error occurs when we are connecting to outside resources like google auth servers. A few people have recommended disabling the firewall\antivirus on the server. I'm just wondering what kind of security risk we would take by doing this. The server doesn't have iis installed but would it be vulnerable to hacking without the firewall? Thanks

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• Powershell script to append an extension to a file, input from CSV

  - by Jeremy

  Hi All, All I need is to have an Excel list of file paths and use Powershell to append (not replace) the same extension on to each file. It should be very simple, right? The problem I'm seeing is that if I go input-csv -path myfile.csv | write-host I get the following output: @{FullName=C:\Users\jpalumbo\test\appendto.me} @{FullName=C:\Users\jpalumbo\test\append_list.csv} @{FullName=C:\Users\jpalumbo\test\leavemealone.txt} In other words it looks like it's outputting the CSV "formatting" as well. However if I just issue import-csv -path myfile.csv, the output is what I expect: FullName -------- C:\Users\jpalumbo\test\appendto.me C:\Users\jpalumbo\test\append_list.csv C:\Users\jpalumbo\test\leavemealone.txt Clearly there's no file called "@{FullName=C:\Users\jpalumbo\test\leavemealone.txt}" and a rename on that won't work, so I'm not sure how to best get this data out of the import-csv command, or whether to store it in an object, or what. Thanks!!

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• Jetty8 virtual hosts

  - by Martin

  I have a server JAR that is deployed once per customer, it is the API server for their software package. To that end, the port for each API instance must be the same, so that anything programmed against it can always find it. Each instance is deployed on a different domain name The problem I'm having is that, even when using a SelectChannelConnector and setting the host property, I can't get two instances to run simultaneously, I get a BindException with "Address already in use". I suppose my question is: can Jetty do this, or do I need to do some external re-writing, or is there a better way I can go about achieving the same ends? Thanks.

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• How to to specify network address for a dhcp client

  - by drecute

  I have setup and configured a DHCP server on a sparc running Solaris 10. Now I want to test the DHCP server by creating a DHCP client on another computer running Solaris 11. I would like to know, how do I specify a network address for a dhcp client such that its generated ip address is within a specific subnet. For example: The DHCP server host = 172.1.1.1 So I want the client machine to have an IP Address in the range of 172.1.1.1 255.255.255.0. Please help me.

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• VMWare Workstation can't read CD/DVD drive

  - by Chris W

  A fresh install of VMWare Workstation 7 (7.1.1 build 282343) on Windows 7 64 bit. When I try to read a CD/DVD from a guest (either to install a fresh guest or to read a CD within an existing VM I get the following error: Cannot connect virtual device ide1:0 because no corresponding device is available on the host. I've tried fiddling with the IDE channels as well as tried SCSI with no joy. What am I missing? I can run ISOs fine but I don't want to have to convert everything to an ISO when I presume that this should just work fine.

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• [SOLVED] vmware problems - networking - no packet response

  - by jack

  XP is my host. Ubuntu is my Guest in VMware. When I do the following commands, I should get SMTP respones but now get no response. I use wireshark to analayze it. Also in wireshark shows nothing. root@vmware:~# netcat 192.168.1.2 25 220 762462a8c4d Microsoft ESMTP MAIL Service, Version: 6.0.2600.5949 ready at Fri, 12 May 2010 18:04:20 +0800 EHLO SAYHELLO VRFY TEST@LOCALHOST test \ sdfsafsd How can I fix it? UPDATE: I came to know that this is no VMWare problem. This is Netcat problem. For this, you might have to type Ctrl+M {ENTER} {ENTER}

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