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• rsync ssh not working in crontab after reboot

  - by kabeer

  I was using a script to perform rsync in sudo crontab. The script does a 2-way rsync (from serverA to serverB and reverse). the rsync uses ssh to connect between servers. After i reboot both the server machines, the rsync is not working in sudo crontab. I also setup a new cronjob and it fails, The error is: rsync error: unexplained error (code 255) at io.c(600) [sender=3.0.6] rsync: connection unexpectedly closed (0 bytes received so far) [receiver] However, when run from terminal, the rync script works as expected without issues. please help. looks like issue with ssh. however, i am able to ssh into either servers withoiut issues.

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• Static IPv6 address advertising and IPv6 autoconfig in Debian/Ubuntu

  - by Pascal

  I have a network that advertises IPv6 addresses through IPv6 autoconfig. To allow DNS lookups and to have fancy IP addresses, we setup "static" IPv6 addresses through /etc/network/interfaces: auto eth0 iface eth0 inet dhcp iface eth0 inet6 static address a:b:c:d:e::f netmask 64 Whenever we now connect through IPv6 Linux uses the IPv6 autoconfig address: a:b:c:d:21d:60ff:fe4a:479 and not the static IPv6 address: a:b:c:d:e::f A server on the other side only sees the autoconfig address. Is there a way to force linux (Debian/Ubuntu) to use the static address for outgoing packets? This is especially interesting for reverse DNS and firewall settings. I don't want to disable the IPv6 autoconfig since I don't have control over the settings the router advertises.

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• Windows XP computer can't see Windows 7 shares

  - by Alex Brault

  I am building a network containing notably a laptop running XP and a computer running Windows 7. Both computer have shared folders and the 7 has a shared printer, to which another laptop running 7 is able to print. If I attempt to see the laptop's network shares on the PC, everything works perfectly: I am able to see and enter the folders. The reverse operation however doesn't work. Xp doesn't see the Windows 7 PC. Other things to note: As mentioned above, another Windows 7 computer is able to see the printer and I can ping both computers from either PC. Both computers are in the same workgroup named ALLAITEMENT Password-protected shares are turned off on the PC. The 7 Computer uses 40/56 bit encryption The Windows XP laptop has SP3

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• CIFS(Samba) + ACL = not working

  - by tst

  I have two servers with Debian 5.0. server1: samba 2:3.2.5-4lenny9 smbfs 2:3.2.5-4lenny9 smb.conf: [test] comment = test path = /var/www/_test/ browseable = no only guest = yes writable = yes printable = no create mask = 0644 directory mask = 0755 server1:~# mount | grep sda3 /dev/sda3 on /var/www type ext3 (rw,acl,user_xattr) # getfacl /var/www/_test/ # file: var/www/_test/ # owner: www-data # group: www-data user::rwx group::rwx other::r-x default:user::rwx default:user:www-data:rw- default:user:testuser:rw- default:group::rwx default:mask::rwx default:other::r-x server2: samba-common 2:3.2.5-4lenny9 smbfs 2:3.2.5-4lenny9 server2:~# mount.cifs //server1/test /media/smb/test -o rw,user_xattr,acl server2:~# mount | grep test //server1/test on /media/smb/test type cifs (rw,mand) server2:~# getfacl /media/smb/test/ # file: media/smb/test/ # owner: www-data # group: www-data user::rwx group::rwx other::r-x default:user::rwx default:user:www-data:rw- default:user:testuser:rw- default:group::rwx default:mask::rwx default:other::r-x And there is the problem: server2:~# su - testuser (reverse-i-search)`touch': touch 123 testuser@server2:~$ touch /media/smb/ testuser@server2:~$ touch /media/smb/test/123 touch: cannot touch `/media/smb/test/123': Permission denied Whats wrong?!

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• Why aren't connections released by the tomcat AJP connector

  - by Chris

  I have here a jboss with a web application. The tomcat is configured to use the ajp connector. Incoming connections are tunneled via an apache reverse proxy to the connector. Now I recognized that under heavy load the connector keeps a bunch of connections in "keep alive" mode for eternity and doesn't release them any more. With the normal HTTP connector the app did well, but now with the ajp connector we have regular app stallments. Can someone give me some advice where to start to look to resolve this issue? Why does the connector not release the connection again after idling for 300 secs? thanks, chris

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• How to setup equivalent USVIDEO.ORG DNS-Proxy on Linux

  - by Gary

  I have a VPS in the USA running Ubuntu. I want to setup something similar to http://www.usvideo.org Basically, USVIDEO is a DNS service that allows Canadians to access American content like Hulu, Netflix, NBC, and etc (restricted by geographical IP). Here is how I think USVideo does it: Clients (PS3, XBOX, PC) specifies the DNS server(s) as specified on USVIDEO.org's website. If the DNS request is a video/audio site such as Netflix or Pandora, forward the request to a proxy. Otherwise, for all other requests, forward it to a different DNS server. If the specific video/audio URL is requested, return the address of the proxy server, which in turn relays traffic to the destination video/audio domain via the U.S. gateway so that it appears that the access is coming from a U.S. IP address. Once the DNS request has passed the U.S. IP address check, their proxy server steps out of the loop and lets the video streaming site contact you directly to start the video stream. This trick relies on the way that the video streaming sites check the country of your IP address once up front, but don't actually check the country of the destination IP address while the video is streaming. What is elegant about this solution is that a VPN Tunnel is not required to bypass geographical IP checks from certain websites. All that is required on the client side is to specify the DNS server (the VPS). If a certain site is geographically locked, just forward the traffic to a proxy, and that's it. These sites can be specified in the DNS entries, or perhaps in the proxy service to redirect the DNS request to its own proxy. I believe what I need to setup something similar is Squid Proxy, IPTables, and DNS. What I need help is how to exactly approach this? Would Squid Proxy be setup as a transparent proxy?

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• DHCP not responding from laptop or router, but works on directly plugged PC?

  - by Matt H

  I'm at my sister in law's place in Singapore. I'm not from Singapore but am here for a few months. She has some sort of cable modem made by motorolla (SB5101 Surfboard). I think it goes, through starhub or similar provider. Anyhow, her PC is directly attached by cable (not wireless) and she can access the internet. There is no wireless router connected to it. The PC is configured with DHCP and appears to be working. However, the moment I unplug her PC and plug in my laptop, it doesn't get an address. The interesting thing here is that I also see this toredo tunnel adaptor etc. I'm not familiar with what that is. It appears to be being assigned an IP v6 address and an IP v4 address. I thought perhaps it's my laptop, but also when I plug in my DDWRT based router, it also fails to get a DHCP assigned address on the WAN port. I can't also seem to connect into any web configuration on the motorolla modem either. Any ideas? what kind of setup is this? all I'd like to do is plug in my wireless router so I can roam around the house and also access the internet.

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• Setting up Samba shares on a Linux VPS

  - by 101265052760541259879

  Hi, I'm trying to set up a folder that can be accessed via Windows clients over the net on my Linux VPS on which our companies website resides. I know a little bit about Linux, and have used Samba before to browse Windows shares from a Linux laptop. I'm guessing it's possible to do the reverse - to share a folder from Linux TO a Windows client. I have root SSH access to the VPS, would anyknow know what steps I need to take to set up the share, and how I can secure it, ideally with a simple username/password so the Windows clients can connect easily? Many thanks, Jack

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• perl sorting an array of hashes

  - by srk

  use strict; my @arr; $arr[0][0]{5} = 16; $arr[0][1]{6} = 11; $arr[0][2]{7} = 25; $arr[0][3]{8} = 31; $arr[0][4]{9} = 16; $arr[0][5]{10} = 17; sort the array based on hash values so this should change to $arr[0][0]{6} = 11; $arr[0][1]{9} = 16; $arr[0][2]{5} = 16; $arr[0][3]{10} = 17; $arr[0][4]{7} = 25; $arr[0][5]{8} = 31; first sort on values in the hash.. when the values are same reverse sort based on keys... Please tell me how to do this.. Thank you

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• DHCP request error. Send_packet now permitted, How to debug, What does it mean

  - by Sparsh Gupta

  Hello I recently installed CSF firewall and have made live a new server which is accepting around 600req/second. Its basically a reverse proxy and I found in pingdom and munin that for a particular time, the response times of the server increased by 3 folds. I looked into logs and exactly at that point, I found loads of entries like this: Feb 27 15:22:09 li235-57 dhclient: DHCPREQUEST of <My IP address> on eth0 to 207.192.68.72 port 67 Feb 27 15:22:09 li235-57 dhclient: send_packet: Operation not permitted Can you help me understand what went wrong and what exactly happened. Is there any settings I should change in CSF or any pointer to debug this further Thanks

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• Function keys on Dell laptop work double as OEM keys

  - by Factor Mystic

  I'm working with a new Dell Studio 1555, and the F1-F12 keys at the top of the keyboard are dual function with OEM keys such as volume and screen brightness. The problem is, is that the OEM keys are the default, and you have to press the Fn key to get the F- key to work. For example, this means you have to hit Alt+Fn+F4 to close a window, instead of the regular Alt+F4. This is really annoying. Is there a way to reverse the default functions of the F- keys in Windows? Ideally this is possible without some kind of third party hotkey manager.

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• Necesity of ModSecurity if Apache is behind Nginx

  - by Saif Bechan

  I have my Apache installed behind Nginx. So every request that comes in is first handeled by Nginx. If there is dynamic content needed the request is send to Apache which listens on port 8080. Pretty basic reverse proxy setup. Now with this setup the first entry point is Nginx. Is it still needed to install ModSecurity to protect Apache against unwanted request. Or should I just focus on protecting Nginx as this is the first entry point. All suggestions are welcome.

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• Keeping local windows folder in sync with remote ftp folder in real time

  - by bobo

  I know it has been asked before, but I would like it to happen in real time and transparently (without the need to open a separate FTP client such as FileZilla). For example, if I edit a text file in the local folder and then save it, it should immediately detect it and push the changes to the remote folder. It can be unidirectional (changes made on the local folder has to be pushed to the remote folder but the reverse is not necessary). It should also be able to specify some excluded files/folders which do not need to be in sync. Is there such an application that you know of?

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• Problem with shared ssh keys

  - by warren

  Following the process I've used in other environments, I've tried setting-up shared keys between my Mac and my CentOS 4 webserver. I've seen the same problem with my older Ubuntu 7.10 workstation trying to connect via keys to the same webserver. I have tried both dsa and rsa keytypes (sshkeygen -t <type>). The sshd_config file on my webserver seems to be allowing key-based logins: RSAAuthentication yes PubkeyAuthentication yes AuthorizedKeysFile .ssh/authorized_keys And my .ssh/authorized_keys has my dsa and rsa keys added. Where should I be looking for what to change next to make key-based logins "Just Work™"? Is it related to the line, #UseDNS yes and sshd is trying to do a reverse-lookup on my IP, but cannot because it's NAT'd?

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• Overriding Debian default groups from LDAP

  - by Ex-Parrot

  This is a thing that has always bothered me: how am I best to handle Debian standard groups for LDAP users? Debian has a number of groups defined by default, e.g. plugdev, audio, cdrom and so on. These control access in standard Debian installs. When I want a user from LDAP to be a member of the `audio' group on all machines they log in to, I've tried a few different things: Adding them to the local group on the machine (this works but is hard to maintain) Creating a group in LDAP with the same name and a different GID then adding the user to that group (breaks reverse / forward GID mapping, doesn't seem to work) Creating a group in LDAP with the same name and same GID and adding the user to that group (doesn't seem to work at all, things don't see the LDAP group members) Creating a group in LDAP with the same name and same GID then removing the local group (this works but upsets Debian's maintenance scripts during upgrades that check for local system sanity) What's the best practice for this scenario?

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• Windows Load-Balancing, Forward-Proxying Software

  - by LandonC

  Does anyone know of any Windows software that will do forward-proxying load-balancing, like HAProxy does? There are tons of reverse-proxy solutions, but I can't find any that do what HAProxy does, that is, allows you to load-balance a group of forwarding-proxies. I have a proxy farm (don't ask) that I need to round-robin balance. HAProxy will do it, but is very unstable on Windows. Thoughts? I'd really appreciate it. And yes, this is an actual, production environment question.

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• What program should I use for SSL stripping and re-encrypting

  - by Sparksis

  I'm trying to strip a HTTP over SSL connection down to SSL and then re-encrypt the channel (with a signed certificate(s) I can provide). Of course I want to be able to store captures of all the un-encrypted data. The purpose of this is to reverse engineer a HTTP handshake that is used by a SIP program on my machine. I've tried SSLstrip but it doesn't support what I need it too. Edit: I want something to this effect https://github.com/applidium/Cracking-Siri/blob/master/tcpProxy.rb only more generic and able to write to a pcap stream that wireshark will understand (I'm not sure if this does that). Edit2: upon further inspection this does not create pcap streams. I guess if need be I can write a compatible version but that is not the desired choice.

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• Email sent from server with rDNS & SPF being blocked by Hotmail

  - by Canadaka

  I have been unable to send email to users on hotmail or other Microsoft email servers for some time. Its been a major headache trying to find out why and how to fix the issue. The emails being sent that are blocked from my domain canadaka.net. I use Google Aps to host my regular email serverice for my @canadaka.net email addresses. I can sent email from my desktop or gmail to a hotmail without any problem. But any email sent from my server on behalf of canadaka.net is blocked, not even arriving in the junk email. The IP that the emails are being sent from is the same IP that my site is hosted on: 66.199.162.177 This IP is new to me since August 2010, I had a different IP for the previous 3-4 years. This IP is not on any credible spam lists http://www.anti-abuse.org/multi-rbl-check-results/?host=66.199.162.177 The one list spamcannibal.org my IP is listed on seems to be out of my control, says "no reverse DNS, MX host should have rDNS - RFC1912 2.1". But since I use Google for my email hosting, I don't have control over setting up RDNS for all the MX records. I do have Reverse DNS setup for my IP though, it resolves to "mail.canadaka.net". I have signed up for SNDS and was approved. My ip says "All of the specified IPs have normal status." Sender Score: 100 https://www.senderscore.org/lookup.php?lookup=66.199.162.177&ipLookup.x=55&ipLookup.y=14 My Mcafee threat level seems fine I have a TXT SPF record setup, I am currently using xname.org as my DNS, and they don't have a field for SPF, but their FAQ says to add the SPF info as a TXT entry. v=spf1 a include:_spf.google.com ~all Some "SPF checking" tools ive used detect that my domain has a valid SPF, but others don't. Like Microsoft's SPF wizard, i think this is because its specifically looking for an SPF record and not in the TXT. "No SPF Record Found. A and MX Records Available". From my home I can run "nslookup -type=TXT canadaka.net" and it returns: Server: google-public-dns-a.google.com Address: 8.8.8.8 Non-authoritative answer: canadaka.net text = "v=spf1 a include:_spf.google.com ~all" One strange thing I found is i'm unable to ping hotmail.com or msn.com or do a "telnet mail.hotmail.com 25". I am able to ping gmail.com and many other domains I tried. I tried changing my DNS servers to Google's Public DNS and did a ipconfig /flushdns but that had no effect. I am however able to connect with telnet to mx1.hotmail.com This is what the email headers look like when I send to a Google email server and I receive the email with no troubles. You can see that SPF is passing. Delivered-To: [email protected] Received: by 10.146.168.12 with SMTP id q12cs91243yae; Sun, 27 Feb 2011 18:01:49 -0800 (PST) Received: by 10.43.48.7 with SMTP id uu7mr4292541icb.68.1298858509242; Sun, 27 Feb 2011 18:01:49 -0800 (PST) Return-Path: Received: from canadaka.net ([66.199.162.177]) by mx.google.com with ESMTP id uh9si8493137icb.127.2011.02.27.18.01.45; Sun, 27 Feb 2011 18:01:48 -0800 (PST) Received-SPF: pass (google.com: domain of [email protected] designates 66.199.162.177 as permitted sender) client-ip=66.199.162.177; Authentication-Results: mx.google.com; spf=pass (google.com: domain of [email protected] designates 66.199.162.177 as permitted sender) [email protected] Message-Id: <[email protected] Received: from coruscant ([127.0.0.1]:12907) by canadaka.net with [XMail 1.27 ESMTP Server] id for from ; Sun, 27 Feb 2011 18:01:29 -0800 Date: Sun, 27 Feb 2011 18:01:29 -0800 Subject: Test To: [email protected] From: XXXX Reply-To: [email protected] X-Mailer: PHP/5.2.13 I can send to gmail and other email services fine. I don't know what i'm doing wrong! UPDATE 1 I have been removed from hotmails IP block and am now able to send emails to hotmail, but they are all going directly to the JUNK folder. UPDATE 2 I used Telnet to send a test message to port25.com, seems my SPF is not being detected. Result: neutral (SPF-Result: None) canadaka.net. SPF (no records) canadaka.net. TXT (no records) I do have a TXT record, its been there for years, I did change it a week ago. Other sites that allow you to check your SPF detect it, but some others like Microsofts Wizard doesn't. This iw what my SPF record in my xname.org DNS file looks like: canadaka.net. 86400 IN TXT "v=spf1 a include:_spf.google.com ~all" I did have a nameserver as my 4th option that doens't have the TXT records since it doens't support it. So I removed it from the list and instead added wtfdns.com as my 4th adn 5th nameservers, which does support TXT.

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• XML Schema For MBSA Reports

  - by Steve Hawkins

  I'm in the process of creating a script to run the command line version of Microsoft Baseline Security Analyzer (mbsacli.exe) against all of our servers. Since the MBSA reports are provided as XML documents, I should be able to write a script or small program to parse the XML looking for errors / issues. I'm wondering if anyone knows whether or not the XML schema for the MBSA reports is documented anywhere -- I have goggled this, and cant seem to find any trace of it. I've run across a few articles that address bits and pieces, but nothing that addresses the complete schema. Yes, I could just reverse engineer the XML, but I would like to understand a little more about the meaning of some of the tags. Thanks...

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• Como instalar Windows (x86/x64) sobre Linux (Ubuntu)

  - by yorrany

  I installed Ubuntu edition (10.04) on my windows 7, completely eliminating it to the original installation. After I was forced to reverse the process, but could not find tools or explanations of how to do it. To clarify the equipment, it is: a netbook, acer, no optical drive cd / dvd, the process should be fully via USB. I hope I was clear enough, count on the support of you. Thank you. -- Instalei a edição Ubuntu (10.04) sobre meu Windows 7, eliminando completamente a a instalação original. Depois fui forçado à reverter o processo, mas não encontrei ferramentas ou explicações de como fazê-lo. Para esclarecer sobre o equipamento, trata-se de: um netbook, acer, sem leitor óptico de cd/dvd, o processo deverá ser totalmente via USB. Espero ter sido bastante claro, conto com o suporte de vocês. Muito obrigado.

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• Make server unavailable gracefully using Powershell in ARR

  - by Carl Bergquist

  We are using ARR as reverse proxy and I would like to make a server unavailable for various reasons. How can this be done using Powershell? Edit 1: I found this http://blogs.iis.net/anilr/archive/2009/11/09/using-arr-config-extensibility-to-gracefully-stop-server.aspx tutorial for using JScript. But I'm not able to translate it to powershell. Edit 2: Using the Set-WebConfigurationProperty in WebAdministration module I'm able to changes settings for a server. I found SetState in %windir%\system32\inetsrv\config\schema\arr_schema.xml but I don't know how to invoke that method.

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• Route gameserver traffic through cloudflare?

  - by Michael

  I use cloudflare for my website and we have a gameserver I was wondering if it is possible to route traffic through cloudflare. This recently sprung into my head when I realized that I could route Shoutcast through another of cloudflares port (8080) which does not do any performance enhancing or anything it just acts as a reverse proxy and stops DDoS. I then tried by setting up a subdomain with my gameserver IP cloudflared and then pinged the IP and Port. It seems to have connections but when actually connecting via the game it doesnt. Any ideas?

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• Where does apache store initialization state for mod_proxy_balancer

  - by khoxsey

  I run apache2 on Ubuntu as a caching load-balancing reverse proxy in front of a group of application servers. I have noticed that the balancer maintains some state for some of the attributes visible in /balancer-manager such as whether an IP is enabled/disabled, load factor, etc. My site has periods of high (and low) usage, and recently as I added a new server to the working group I noticed that the load balancer picked up the new server but had it set to Disabled. I'm curious where that data is stored, and/or how it is initialized.

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• Mono on Linux: Apache or Nginx

  - by Furism

  Hi, I'm developing an ASP.NET application that will be run under Linux/Mono for various reasons (mostly to stay away from IIS, quite frankly). Of course the first web server I had in mind was Apache. But Apache, for all its advantages, adds a lot of overhead. Also, the application I'm building needs to be highly scalable and performance is one of the main concern. Apache has, obviously, a very good reputation and its record speaks for itself, but I don't need things like Reverse Proxy or Load Balancing because dedicated network devices would be used for that. So those modules from Apache will never be used. So basically my question is: since Nginx seems to fit exactly needs, is there any caveat I should be aware of? For instance, is Nginx renowned to be particularity safe? When security flaws are detected, how fast are they patched? Any insight on the pros and cons of using either of those servers in conjunction with Mono is welcome.

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• setting up a proxy to mirror an SSH SOCKS connection

  - by aresnick

  I have two remote machines, remote1 and remote2. remote2 is only running sshd, and I can't run anything else on it. remote1 is a full-fledged server to which I have complete access. I can run a SOCKS proxy on remote2 via ssh -f -N -D *:8080 me@remote2 which lets me expose a SOCKS proxy on port 8080 on remote1. I'd like to authenticate this so that the proxy isn't sitting open. How can I do this? It seems like I should be able to use delegate, but I can't even seem to get its HTTP proxy functionality working. When I run delegated -r -P8081 SERVER=http PERMIT="*:*:*" REMITTABLE="*" I can't even get it to work on port 8081. Anyway, I was hoping someone could point me in the right direction to let me authenticate access to the SOCKS proxy connection? That is, I want to be able to point my browser's proxy at remote1 and browse the internet through the SSH SOCKS proxy/tunnel to remote2. squid doesn't support a SOCKS parent =( Thanks!

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