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• Forcing the from address when postfix relays over smtp

  - by John Whitlock

  I'm trying to get email reports from our AWS EC2 instances. We're using Exchange Online (part of Microsoft Online Services). I've setup a user account specifically for SMTP relaying, and I've setup Postfix to meet all the requirements to relay messages through this server. However, Exchange Online's SMTP server will reject messages unless the From address exactly matches the authentication address (the error message is 550 5.7.1 Client does not have permissions to send as this sender). With careful configuration, I can setup my services to send as this user. But I'm not a huge fan of being careful - I'd rather have postfix force the issue. Is there a way to do this?

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• Hiding "Syntax OK" from apache2ctl output

  - by Oscar Barrett

  I am checking whether a particular apache module is installed using apache2ctl -M. When listing the modules, apache runs a syntax check on the configuration files which prints out "Syntax OK" if everything is fine. However, this message doesn't seem to be coming from STDOUT or STDERR as it shows even if all output is redirected to /dev/null. i.e. $ sudo apache2ctl -M Loaded Modules: core_module (static) log_config_module (static) ... Syntax OK $ sudo apache2ctl -M >/dev/null Syntax OK How is this being outputted, and is it possible to hide?

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• Why is access to my database very slow?

  - by Fabien

  I have a mysql database that used to work perfectly fine, but now it is dead slow on startup. When I type in $> mysql -u foo bar I get the following usual message for about 30 seconds before I get a prompt : Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Of course, I tried it and it goes a lot faster : $> mysql -u foo bar -A But why do I have to wait so long in regular startup ? This is not a very big database, and data does not seem to be corrupted (everything looks fine after startup). I have no other client connecting to the mysql server at the same time (only one process is shown with the command show full processlist) and I have already restarted the mysqld service. What's going on ?

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• Upgraded to Ubuntu 12.04 from 10.04 and have to transfer database from Postgresql 8.4 to 9.1

  - by Stpn

  I upgraded server with a Rails application to Ubuntu 12.04 from 10.04 and cannot connect to Postgresql database now... Here is the error message from Rails app: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432" Also the pg_ctl start is not recognized as a command.. EDIT: Turns out my database in on Postgresl 8.4 and my sever is now running on 9.1. So all the database files / configs are on 8.4.. How can I transfer them? Just straight copy from old pg_hba.conf?

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• Cannot boot from Yumi multiboot USB stick

  - by Amator

  I've just created a multiboot USB stick using Yumi. I tried to start my notebook (Asus K70IO) using it, but all I see is just a black screen with blinking underscore even after waiting for minutes. If during this time I remove the USB stick I get the message: "Operating system load error". How do I properly load my Yumi USB stick and use it? I've tried formatting it using Yumi's checkbox to format the stick in FAT32 too, but it didn't help. Now I tried to use Sardu 2.0.5 and met same problem: black screen and blinkin underscore, if I remove stick I see "Operating system load error" and my OS starts to boot. At the same time if I create bootable USB stick from ISO using UltraISO it boots smoothly.

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• Ubuntu 13.10 Unity doesn't load after upgrade

  - by William

  Just upgraded to Ubuntu 13.10 only to find that Unity won't load (login freezes, after doing ctrl+alt+F1, logging in and then doing startx, I get a blank desktop and the mouse pointer, and nothing else). I can right click, but the only operations that work are "create new file" and "create new folder". For example, "change desktop background" doesn't work. Also, after doing a few right clicks and choosing "change desktop background", I get a warning message box: "compiz closed unexpectedly." Guest login works fine. Tried creating a new user, but I experience the same thing with the new user. Tried removing all configuration files from my home directory... same thing. Doing dconf reset -f /org/compiz/ gives an error "error spawning command line..." Doing unity --reset also gives errors. Tried uninstalling unity (and compiz) and reinstalling, but that doesn't help. Tried reconfiguring lightdm, didn't help. I don't have any proprietary drivers installed. Once again, the funny thing is that the guest session works fine.

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• HDMI connection does not support HDCP

  - by mroggi

  Hi, My problem: error message when playing blu-ray movies stating that the HDCP encryption could not be established. My setup: A new projector (EPSON EMP TW700) with a HDCP-compliant HDMI port a PC with a brand-new graphics adapter (Sapphire HD 4350 512MB DDR2) supporting HDCP Connection made with a DVI cable (it's installed in my wall) and a DVI-HDMI adapter to connect the projector Latest drivers and software My questions: What can I do to establish the HDCP connection? Would it help to use the HDMI output of the graphics adapter instead of the DVI (could it be that the HDCP chip is only supported on HDMI?) Any other ideas? I am very thankful for any hint.

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• Serve my website from different server during downtime

  - by nfedyashev.mp

  I have a VPS server running in the cloud. Fully automated server image upgrade/downgrade(by RAM/HDD plans). The problem is that server upgrade/downgrade takes time and involves total unavailability during this period(up to 30 minutes). Goal: during this downtime server my website(http://mydomain.here) from different server with some message like "Under construction". How can I do this? -- mydomain.here is hosted on godaddy and uses its DNS(If I call it right). It's pointing with A-record to my VPS's IP address now. Change in these DNS settings will take more than 30minutes, so it's not an option. How can I find mode "dynamic" DNS? What should I learn?

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• Spam mail through SMTP and user spoofing

  - by Josten Moore

  I have noticed that it's possible to telnet into a mailserver that I own and send spoofed messages to other clients. This only works for the domain that the mail server is regarding; I cannot do it for other domains. For example; lets say that I own example.com. If I telnet example.com 25 I can successfully send a message to another user without authentication: HELO local MAIL FROM: [email protected] RCPT TO: [email protected] DATA SUBJECT: Whatever this is spam Spam spam spam . I consider this a big problem; how do I secure this?

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• Solving &ldquo;XmlSchemaException: The global element '&lt;elementName&gt;' has already been declare

  - by ChrisD

  I recently encountered this error when I attempted to consume a new hosted WCF service.  The service used the Request/Response model and had been properly decorated.  The response and request objects were marked as DataContracts and had a specified namespace.   My WCF service interface was marked as a ServiceContract and shared the namespace attribute value.   Everything should have been fine, right? [ServiceContract(Namespace = "http://schemas.myclient.com/09/12")] public interface IProductActivationService { [OperationContract] ActivateSoftwareResponse ActivateSoftware(ActivateSoftwareRequest request); } well, not exactly.  Apparently the WSDL generator was having an issue: System.Xml.Schema.XmlSchemaException: The global element 'http://schemas.myclient.com/09/12:ActivateSoftwareResponse' has already been declared. After digging I’ve found the problem; the WSDL generator has some reserved suffixes for its entities, including Response, Request, Solicit (see http://msdn.microsoft.com/en-us/library/ms731045.aspx).  The error message is actually the result of a naming conflict.  The WSDL generator uses the namespace of the service to build its reserved types.  The service contract and data contract share a namespace, which coupled with the response/request name suffixes I was using in my class names, resulted in the SchemaException. The Fix: Two options: Rename my data contract entities to use a non-reserved keyword suffix (i.e.  change ActivateSoftwareResponse to ActivateSoftwareResp). or; Change the namespace of the data contracts to differ from the service contract namespace. I chose option 2 and changed all my data contracts to use a “http://schemas.myclient.com/09/12/data” namespace value. This avoided a name collision and I was able to produce my WSDL and consume my service.

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• Linux kernel startup problems: how to analyze?

  - by java.is.for.desktop

  Hello, everyone! After manually updating the kernel from 2.6.33 to 2.6.34 on my OpenSuse 11.2 Notebook, it stops after the message Loading drivers, configuring devices... This stop can be interrupted with Ctrl-C, but when the system enters runlevel 5, no partitions are mounted (but the root partition), many services fail to start, and other strange things are going on. No X11. NOTE: I manually updated the kernel many times before, it worked. Yes, I know, in case of NVidia, the driver has to be recompiled. The question is: How can I analyze the cause of the problem? Doing dmesg gives me soooo much output, I can't "map" it to the output which I see at startup. The output does not contain the string Loading drivers, configuring devices, or similar.

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• Bind9 forwarding zone not working

  - by JMW

  i've setup a forwarding zone on a RHEL6 Bind server like this: zone "office.local" IN { type forward; forward only; forwarders { 192.168.0.2; 192.168.0.3; }; }; when i try to query using dig @127.0.0.1 monitorsms.office.local i see the following message in the syslog: client 127.0.0.1#39376: query: monitorsms.office.local IN A + (127.0.0.1) validating @0x7ff7640357d0: monitorsms.office.local A: bad cache hit (monitorsms.office.local/DS) google tells me, that there is an issue with DNSSEC, but both servers do not have DNSSEC configured and thus do not send any DNSSEC records. What's wrong with my configuration?

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• Windows remote shutdown: access denied

  - by gregseth

  I have 3 "client" computers, on which the mentioned user is administrator: CPU1: Win Vista 32-bit -- User: Domain\User1 -- IP: 192.168.42.1 CPU2: Win 7 64-bit -- User: localhost\User2 -- IP: 192.168.42.2 CPU3: Win 7 64-bit -- User: Domain\User3 -- IP: 192.168.42.3 And a "target" computer (the one that I want to shutdown from the three others): TGT: Win 7 64-bit -- User: localhost\User4 -- IP: 192.168.42.21 I'm trying to shutdown TGT with the following command: shutdown /s /m \\192.168.42.21 It's working from CPU1 (meaning TGT shuts down), but from CPU2 and CPU3 I get the following message: Access denied. (5) What am I to understand? What should I do to get it working form all of my computers.

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• Installed IE8 & SP3 on XP now I can't HTTPS from any browser

  - by Kevin

  The computer is Windows XP Professional SP3 with IE8. On the Tools Options Connections the "Settings" is GRAYED OUT (I am an admin on the machine) Any browsing of https:// addresses results in IE displaying the following: "this program cannot display the web page" After installing an alternate browser and trying the same https:// address I get a similar error message. I have tried using Compatibility View Settings to for all web pages and this has no effect on the problem. HTTP addresses work fine, I can PING sites such as google.com without issue. Question: What could be preventing me from getting at the settings to check to see if I'm using a proxy? What else could be preventing HTTPS access?

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• after install python 2.7.3 yum is broken

  - by user468587

  i installed libxml2-2.9.0 and libxslt-1.1.27 then yum is broken any yum command that i ran i got the result of : There was a problem importing one of the Python modules required to run yum. The error leading to this problem was: No module named yum Please install a package which provides this module, or verify that the module is installed correctly. It's possible that the above module doesn't match the current version of Python, which is: 2.4.3 (#1, Jan 21 2009, 01:11:33) [GCC 4.1.2 20071124 (Red Hat 4.1.2-42)] If you cannot solve this problem yourself, please go to the yum faq at: http://yum.baseurl.org/wiki/Faq then i thought python version is way too old and install python 2.7.3 and install it from scratch, after some wrong trials it got worse and worse, now when i run 'python -V' i got version 'Python 2.7.3', when i run '/usr/bin/python -V', it returned 'python-2.4.3-24.el5', and no matter what i did the yum is still broken with that message. how can i get yum back? my os is: linux 2.6.18-164.11.1.el5 x86_64 GNU/Linux

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• Emails Generated From Our Linux Server are Blocked By Our Exchange Server (That Has Barracuda)

  - by Scott

  We have our company website hosted on a Linux machine. It is sending mail via postfix. The emails are working and being sent to all email clients like Gmail. However, we are not receiving the emails on our exchange server. When we look at the logs, we see that the connection is being refused, presumably by the exchange server. postfix/qmgr[11865]: DA6D42FF13: from=<[email protected]>, size=3166, nrcpt=1 (queue active) postfix/smtp[12474]: connect to mail.sanitizeddomain.com[XXX.XXX.XXX.XXX]:25: Connection refused postfix/smtp[12474]: DA6D42FF13: to=<[email protected]>, relay=none, delay=172915, delays=172914/0.03/0.07/0, dsn=4.4.1, status=deferred (connect to mail.sanitizeddomain.com[XXX.XXX.XXX.XXX]:25: Connection refused) We do run Barracuda. We cannot telnet from the linux machine to our mail server b/c we get the same message.

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• Allowing access to MPD from local network

  - by August Karlstrom

  I have successfully installed MPD (Music Player Daemon) on my desktop computer. Everything works fine when the client runs on the same machine as the server. Now I would like to access MPD from my laptop computer which is connected (wirelessly) to the local network. In order to allow access to MPD from any computer on the local network I have added this line to /etc/hosts.allow: mpd: .local and restarted MPD. Still I get the message "error: Connection refused" when I try to access MPD with MPC (Music Player Client) from my laptop. Any clues or troubleshooting hints?

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• Incompleted ubuntu 12.04 install dual-boot xp

  - by Mike

  This weekend has been the 1st time i've tried to install ubuntu. On the initial install, (I am using a USB) the installation went all the way through and asked to restart when completed. I was not able to get grub to boot and kept going through windows. After some research I found some articles on updating/reinstalling grub, so I followed those. I finally got grub to load after a day but there was no windows option only the Ubuntu 12.04 which when I selected it only gave me a fatal error 17. I booted from the usb again and deleted the partitions and installed again. This time I got an error 15. I then booted through xp and downloaded the WUBI.exe and uninstalled ubuntu and reinstalled again. The installation went to the very end and then gave an error message (which I don't remember exactly what it said) something along the lines of checking my logs on my C drive. I then uninstalled ubuntu and removed the wubi.exe file and wiped my usb and did the download to the usb again. Booted through usb and ran the install process again. It again went through the install process but after creating username and password and hitting continue the installation dialogue box disappears and the mouse spinning wheel is displayed but I do not receive the prompt to restart. I can still access the side menu for ubuntu but the wheel keeps spinning. How to I get Ubuntu to install properly

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• In the Aggregate: How Will We Maintain Legacy Systems? [closed]

  - by Jim G.

  NEW YORK - With a blast that made skyscrapers tremble, an 83-year-old steam pipe sent a powerful message that the miles of tubes, wires and iron beneath New York and other U.S. cities are getting older and could become dangerously unstable. July 2007 Story About a Burst Steam Pipe in Manhattan We've heard about software rot and technical debt. And we've heard from the likes of: "Uncle Bob" Martin - Who warned us about "the consequences of making a mess". Michael C. Feathers - Who gave us guidance for 'Working Effectively With Legacy Code'. So certainly the software engineering community is aware of these issues. But I feel like our aggregate society does not appreciate how these issues can plague working systems and applications. As Steve McConnell notes: ...Unlike financial debt, technical debt is much less visible, and so people have an easier time ignoring it. If this is true, and I believe that it is, then I fear that governments and businesses may defer regular maintenance and fortification against hackers until it is too late. [Much like NYC and the steam pipes.] My Question: Is there a way that we can avoid the software equivalent of NYC and the steam pipes?

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• Getting file system free space

  - by Fred Riley

  This isn't a problem as such, more a request for information based on ignorance of the Linux filesystem. The very short question is: How do I find out how much free and used space there is on the volume from which Ubuntu is running? More detail: I'm running Ubuntu 12.04 from a 64Gb USB3 stick, created from booting up a year-old Ubuntu 12.04 DVD and running Startup Disk Creator. The reason for this is that the Master Boot Record on my hard disk, holding Windoze 7, has gone belly-up, and whilst awaiting a recovery disk I'm running Ubunto off USB or DVD as a 'trial'. (And will continue to run Ubuntu after restoring Windoze, as I've rediscovered my love of the penguin :o)) After installing Ubuntu on the stick I ran the software update app, which downloaded some 450Mb of updates and took a couple of hours to install to the stick. A couple of times I got a message saying that disk space was short. So I looked in the file manager (or whatever it's called these days) and couldn't see the stick listed, just: SYSTEM hard disk (listed as 479Gb Filesystem) two other partitions that had been created by Windoze "4.3GB Filesystem" which when I try to open gives the error "Could not find /cow", and when I try to unmount it tells me I can't because it's not mounted - D'OH!! Edit: screenshot of file manager Edit: screenshot of low disk space warning What I can't see is the USB stick from which I'm running Ubuntu. Where's it gone, anybody know? This is tangentially related to a previous question of mine about system tools, in that I'm trying to get control and knowledge of the system in the newest incarnation of Ubuntu.

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• Flow of packets in network

  - by user58859

  I can't visualize in my mind the network traffic flow. eg. If there are 15 pc's in a LAN When packet goes from router to local LAN, do it passes all the computers? Does it go to the ethernet card of every computer and those computers accept the packet based on their physical address? To which pc the packet will go first? To the nearest to the router? What happens if that first pc captures that packet(though it is not for it)? What happens when a pc broadcast a message? Do it have to generate 14 packets for all the pc's or only one packet reach to all pc's? If it is one packet and captured by first pc, how other pc's can get that? I can't imagine how this traffic is exactly flows? May be my analogy is completely wrong. Can anybody explain me this?

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• Install Git on a Media Temple (dv) 4.0 server

  - by Chris

  I'm trying to install Git on my Media Temple (dv) 4.0 server. I've followed these instructions. It seems to have "installed", as there are a boat-load of files in the /root/git-2012-06-06 directory. However, when I perform any git command in the server, I receive this message: git: command not found My assumption is that something, somewhere is not configured properly, but I have no idea where to start. Could anybody lend a hand / offer some pointers? (And if you hadn't guessed, I'm pretty new to all this, so please be kind!)

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• How do I purge or empty Windows Explorer's network username and sharename cache?

  - by Abel

  While troubleshooting a Samba vs Windows Network issue, I noticed that Windows' Explorer remembers login credentials of remote shares, even if you ask it not to. For instance, after accessing a share using \\servername\sharename plus entering username/password and then closing Windows Explorer, adding the same share as a network drive gives the following message, regardless whether the username is the same or not: The network folder specified is currently mapped using a different user name and password. To connect using a different user name and password, first disconnect any existing mappings to this network share. Using NET USE does not show the share. After restarting the computer, I have no problems accessing the share using different credentials. But restarting just for testing other credentials is annoying, esp. while troubleshooting. How can I purge this cache, using Windows Vista? Note: using nbtstat -R[R], ipconfig /renew, killing explorer.exe or disabling / re-enabling the network card didn't help.

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• IISReset to remote server fails

  - by Rob

  I'm attempting to run iisreset 192.168.100.182 (against a Windows Server 2003 machine) from another machine on the same domain (running Windows 7 Professional) and am receiving the following error message: Attempting stop... Restart attempt failed. Access denied, you must be an administrator of the remote computer to use this command. Either have your account added to the administrator local group of the remote computer or to the domain administrator global group. I'm running the command from an elevated command prompt with my domain account added to the Administrators group on the target machine. I've attempted this when being a member of the administrators group both directly and by virtue of membership of a domain group that's a member of the administrators group. I've reviewed the event log on the target machine and it shows a selection of Success Audits for my domain credentials immediately after attempting the iisreset, but no failure audits.

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• Cannot Join a Domain on VM

  - by arvind0007

  Hi Guys. I have installed Windows 2003 server R2 on a VM. This VM is running on Windows XP PRO. When i try to make this XP Pro PC join the domain on the VM it tries to locate the server and gives me the following error message " The specified network name is no longer available", despite the fact that i can still see this domain on my network. can anyone help with this please. This is the very first time i am trying connecting a client to a VM server so hope am not doing anything wrong.. thanks

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