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• hardware addressing and configurable addressing scheme

  - by Zia ur Rahman

  basically i want to ask question about configurable addressing scheme for LAN interface hardware. i have read about it from a book, some main points are given by a configurable addressing scheme provides a mechanism that a customer can use to set a physical address.The mechanism can be manual (the switches that must be set when the interface is first installed).or an electronic memory such as an EPROM that can be downloded from the computer(what does this means). Most hardware needs to be configured only once- configuration is usually done when the hardware is first installed. Question:Suppose a network administrator configures the LAN interface hardware (assigns the address) when he installs it. Now later on if he needs to change the physical address of the device can he change it? Or in this addressing scheme the hardware can only be configured once and we can not reconfigure it later on.

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• SharePoint site access request denied permissions

  - by Nat

  Here is a good catch-22. When a user without any permissions on a site requests access from the _layouts/AccessDenied.aspx page it takes them to the Request Access page (_layouts/ecm_reqacc.aspx). When the user fills out the form with a simple message it is supposed to send an email to the address specified in the site collection and take them to _layouts/confirmation.aspx. Unfortunately the users are getting another access denied error instead. I have tried going to _layouts/accessdenied.aspx on a site I am the administrator of and the email is sent fine, so it is not a problem with sending the emails. What should I check and/or give access to in order for authenticated, but not permissioned users the ability to send access requests?

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• Why no multiple instances of Firefox on Linux as on Windows?

  - by Jack

  On Windows If I run Firefox as user jack, and then try to start another instance of firefox I will be unable to, as one is already running. If I choose to run firefox as administrator, then I can have two instances of firefox, separate from each other side by side, because they are under different user accounts. This does not seem to be true on Linux. As user jack if I start firefox, like on windows I am unable to start a new instance. If I open a terminal and change to root, set XAUTHORITY to jacks .Xauthority and try to start firefox as root....I get the error that firefox is already running. Why is this? Please don't spare any technical details in your answers....thankyou.

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• Windows not booting, bcd corrupt?

  - by Bolaji Ibrahim

  The windows boot configuration data file does not contain a valid OS entry Windows failed to start. A recent hardware or software change might be the case.to fix the problem: 1.Insert your windows installation disc and restart your computer. 2.Choose your language settings, and click "next" . 3.Click "repair your computer." If you do not have this disc, contact your administrator or computer manufacture for assistance. File: \Boot\BCD Status:Oxc0000098 Info :The windows boot configuration data does not contain a valid OS entry.

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• Tomcat memory usage

  - by Adrian Mester

  I'm running tomcat on a ubuntu 10.4 VPS with 512MB of RAM (1024 burstable). I'm using it for development, so performance isn't an issue, but memory is. Tomcat is currently using about 250MB without any apps installed (I compared memory usage with tomcat stopped and running), and I also need to run lighttpd and mysql. Is there any way to get that number down? I don't need it to be able to handle a large number of requests at once.

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• How can I get my License Key from a boot CD?

  - by dubRun

  We recently acquired a server that's been in use for a while, but no associated software, logins, etc. We attempted to blank the administrator account password, but that didn't work. We also tried some deeper edits on the password, but no avail there either. Now what I'm looking to do is to re-install windows using the existing registry key on the server now. I've read that you can access the product key in the registry, and using the password tool (a linux boot cd) we are able to view the registry. When I tried this, I got the ProductId (Which version of windows), not the registry key. The OS I'm attempting to read from in Windows Server 2003 R2.

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• Help desk cannot respond to UAC prompts over Remote Assistance

  - by blsub6

  I'm trying to use the in-built Remote Assistance (RA) software in Windows 7 to support my users. I initiate a RA session with the user and ask to remotely control their desktop. They tick a little check box that says something to the effect of 'allow helper to respond to UAC prompts' and it pops up with a UAC prompt. The user cannot respond to the UAC prompt because they're not a local administrator - I am. Isn't that what that little check box is for??? I've found this on TechNet from back in '07 on Vista. From what I've found, I could disable UAC (terrible idea) or make all my users local administrators on their computers (yet another terrible idea). I'm hoping that MS has fixed this little oversight in Windows 7. Remote Assistance is completely useless to me if I can't respond to UAC prompts with my username and password

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• How to secure memcached?

  - by alfish

  In Debian, I have installed memcached (using this guide) to lower the otherwise unmanageable load on mysql database. The database is on a separate server, and memcached and Varnish are on the front server. Is it a potential security hole to leave memcached unprotected by a firewall? If so, how should I secure it? The situation is especially worrisome,as I've received (unproved) reports of cookie thefts on the server. Thanks

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• How does one remove an encryption type from a kerberos principal?

  - by 84104

  I would like to remove all of the des keys from the principal below, but have no idea how to do so without someone inputting the password. kadmin: getprinc user Principal: [email protected] Expiration date: [never] Last password change: Thu May 26 08:52:51 PDT 2013 Password expiration date: [none] Maximum ticket life: 0 days 12:00:00 Maximum renewable life: 7 days 00:00:00 Last modified: Tue Jul 16 15:17:18 PDT 2013 (administrator/[email protected]) Last successful authentication: Wed Jul 24 14:40:53 PDT 2013 Last failed authentication: [never] Failed password attempts: 0 Number of keys: 8 Key: vno 3, aes256-cts-hmac-sha1-96, no salt Key: vno 3, arcfour-hmac, no salt Key: vno 3, des3-cbc-sha1, no salt Key: vno 3, des-cbc-crc, no salt Key: vno 3, des-cbc-md5, no salt Key: vno 3, des-cbc-md5, Version 5 - No Realm Key: vno 3, des-cbc-md5, Version 5 - Realm Only Key: vno 3, des-cbc-md5, AFS version 3 MKey: vno 2 Attributes: REQUIRES_PRE_AUTH Policy: [none] Also, the the kdc is using an OpenLDAP backend.

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• How to create a password-less service account in AD?

  - by Andrew White

  Is it possible to create domain accounts that can only be accessed via a domain administrator or similar access? The goal is to create domain users that have certain network access based on their task but these users are only meant for automated jobs. As such, they don't need passwords and a domain admin can always do a run-as to drop down to the correct user to run the job. No password means no chance of someone guessing it or it being written down or lost. This may belong on SuperUser ServerFault but I am going to try here first since it's on the fuzzy border to me. I am also open to constructive alternatives.

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• Blocking HTTP clients which request certain URLs repeatedly

  - by Guido Domenici

  I run a website on Windows Server 2008 R2. Looking through the IIS logs, I have noticed that there are some IP addresses repeatedly requesting certain URLs (such as for example /mysql/phpmyadmin/main.php, /phpadmin/main.php) which do not exist, as the site is entirely served off of ASP.NET. They are obviously fishing for known vulnerabilities. My question is, are there any firewall or other tools (Windows built-in or commercial) that allow me to block those IP addresses which request certain URLs multiple times?

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• Web hosting colo stack, what do i need

  - by james

  I'm looking to colocate a website, obviously running a few apache servers, mysql cluster, SAN servers and load balancer. What else do I need to protect the servers and what would be the best method for DNS as all the web side of things will be in the colo centre and email hosted with another company? Thanks in advance

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• Why am I getting permission denied installing Powershell 2.0 on Windows XP (and certain other update

  - by spoulson

  I'm working on a corporate desktop (still) running Windows XP SP2. I recently received a new PC and am reinstalling all my tools. Something is different about this one in that it won't let me install Powershell 2.0. When I do, I get a popup: You do not have permission to update Windows XP. Please contact your system administrator. This also occurs for other installs, like Service Pack 3 and Windows Installer 4.5. I'm aware this PC is under group policy restrictions, but I haven't narrowed down what restriction is preventing this install so that I can have the appropriate support team resolve it. What setting could be responsible for this?

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• Deny users in a certain group access to dovecot

  - by celil

  I installed the dovecot-imapd package in Ubuntu, and my setup is as follows: $ sudo dovecot -n # 1.2.9: /etc/dovecot/dovecot.conf # OS: Linux 2.6.32-27-generic-pae i686 Ubuntu 10.04.1 LTS log_timestamp: %Y-%m-%d %H:%M:%S protocols: imaps login_dir: /var/run/dovecot/login login_executable: /usr/lib/dovecot/imap-login mail_privileged_group: mail mail_location: maildir:~/Maildir mbox_write_locks: fcntl dotlock auth default: passdb: driver: pam userdb: driver: passwd For security reasons I would like to deny all users that are in the admin group ability to do imap login via dovecot. This is done in order to prevent a brute force attacker from discovering the admin passwords, and obtaining administrator privileges on the system. How can this be achieved? Presumably, I will have to modify some settings in /etc/dovecot/dovecot.conf, but I am hesitant to change the default settings lest I create other security vulnerabilities.

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• Can't Create New folder in my video folder

  - by tiki

  My OS is windows 7 Ultimate 32bit. My video folder location is C:\Users\User\Documents\Downloads\Video. I Can't create folder in the Video folder or see the files i saved. But I can see the files in the root location of the folder i.e by going to the folder from My Computer. I can create and find files when I go to the folder My Computer>C>Users>User>Documents>Downloads>Video. This is an unusual problem I have never seen. Even being a system Administrator I can't able to fix the problem. Please help me out. Thanks in advance

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• Using Remote Desktop, connect to a Windows 7 domain user account without first logging on locally?

  - by Robert S Ciaccio

  I have a dell laptop (henceforth we'll call this the server) running Windows 7 Enterprise. The server is part of my company's domain. My primary user account is a domain account. When I am at home and not connected to the domain, I prefer to connect to the server using Remote Desktop Connection from my MacBook Pro (we'll call this the client). The problem is, that if I do not physically login to the server, I am unable to connect to it using RDC from the client. I have a local administrator account on the server, and connecting to it via RDC works just fine. I had a feeling that the Mac RDC application was not giving me the full story, so I attempted the same procedure from a Windows 7 client. When trying to login, I get this message: So basically, If I logon to the server physically with my domain user and lock the computer, I can then successfully logon from the client. Otherwise, I am unable to connect.

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• gem install rails gives me Error: undefined method include?

  - by johnlai2004

  I'm using ubuntu 9.10, apache 2 and mysql 5. I install ruby 1.8.7 on the server. I ran the command gem install -v 1.2.3 But then I get the error ERROR: While executing gem ... (NoMethodError) undefined method `include?' for nil:NilClass What did I do wrong?

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• squid configuration change to accept http request on LAN

  - by Ratan Kumar

  installed squid + dansguardian to block adult content on my linux (ubuntu 12.10) . everything worked fine. it has blocked as expected . now the problem is i am also running an apache server for my LAN . ( kind of website ) but when accessing it via 192.168.0.1 , it says squid has blocked the connection , this is the exact error The following error was encountered while trying to retrieve the URL: http: //192.168.0.16/ Connection to 192.168.0.16 failed. The system returned: (113) No route to host The remote host or network may be down. Please try the request again. Your cache administrator is webmaster. before configuring the squid it was working fine . what changes in the squid.conf i have to make . i tried acl Safe_ports 80 allow_all Safe_ports ( i want to know how i can configure it again to listen HTTP request from LAN )

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• Can not RDP to Win 2003 box or initiate remote restart

  - by Richard West

  I've got a Windows 2003 server that's at my remote data center. This morning I tried to connect to it via RDP, but the connection fails with the following error: This computer can't connect to the remote computer. Try connecting again. If the problem continues, contact the owner of the remote computer or your network administrator. I have also trying issuing a remote shutdown/restart command using the "shutdown -i" command from my local system. No error is reported, however the system does not reboot. This server runs SQL Server 2005 and it is still fully operational and responsive to queries. I can also remotely connect to the services control panel of the remote system. Is there anything that I can try to regain control of the system, short of having an operator in the data center do a hard reboot on the server for me?

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• php rsync with exec() not working

  - by mojeime

  Why this: rsync -avz -e ssh /home/userneme/folder [email protected]:/var/www/folder works from cronjob and this: exec("rsync -avz -e ssh /home/userneme/folder [email protected]:/var/www/folder"); doesn't work. I know exec is working because i have a few places in my appp that do convercion from pdf to jpg with ImageMagick (exec). SOLVED exec is working OK it was a permission issue on remote server. "Local" server is shared reseller account and remote server is my first VPS Ubuntu 10.10 LAMP box. If only I had a system administrator since i'm just a software developer forced to do this and i stink at it :) Thank You all!

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• Is it advisable to run Apache in a chroot jail?

  - by morpheous

  I have been advised by a sysadmin guy I know, to run Apache in a chroot jail, for increased security. I have the following questions: Is this advisable (i.e. are there any 'gotcha's that I need to be aware of) ? Does running Apache in a chroot jail affect its ability issues like performance and scalability? He also advised that I run my databases (mySQL and PostgreSQL), in separate chroot jails. Is this something that is often done in production systems

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• Logging off does not kill process in Windows Server 2003

  - by Suraj Chandran

  I have a Windows Server 2003(Enterprise, SP2). My understanding was that any process created by a user will be terminated when the user loggs off the account. But its not happening. I login via Administrator account. Start a simple java process and logoff. But the process is not killed. Is there any configuration for this or something? I am mostly a software programmer and not much in to servers and so I am stuck. I found out that while logging off, 1) Win32 is supposed to send a CTRL_LOGOFF_EVENT to all processes started by that user. 2) JVM is supposed to handle this event and terminate the VM. But I can't understand why my java process is not killed when i logoff. Any idea!!!

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• Windows 7 - problems launching default application

  - by Chris W

  Just built up a new W7 PC. I've noticed some strange issues with launching default applications. I've got Visual Studio & SQL Server Management Studio set run as administrator when launched. If i double click a .sql file SSMS opens ok but the file itself does not get loaded. If I do the same with a .sln then I get nothing at all from Visual Studio. For the latter I presume the UAC prompt is hidden somewhere waiting for me to say it's ok to launch the app but i've no idea what's happening with SSMS. Is this a W7 bug or are there some settings somewhere that I can tweak to improve this behaviour?

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• Allow users to view Word documents only and not be able to edit, copy or save them.

  - by Alexander

  Hello In a traditional Windows Server 2003 environment with AD, we have shared a folder for our policy documents (MS Word). These documents get edited/updated now and then by the administrator(principal of college). Users only have read-only access to the folder, but they can still save-as and then change the content. Sharepoint is a possible solution but not easy to implement. We also thought of using a CMS on Linux and installing Joomla to let users only view the docs with a document management system... but is it possible to automatically retrieve the policy folder on the network and convert or put it in a format that users can only view and not copy? We also thought of saving the docs to secure pdf format but the principal wants an automated system. Basically she just wants to work in Word and the policies must be available to staff members on the network. Any ideas? Much appreciated.

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• How do I enable a disabled Event Notification.

  - by Derick Mayberry

  I have a scenerio where I am using external notification to process documents being sent in from the entire navy fleet, normally I have no problems, but just a few days ago an administrator changed passwords and I my queue processing failed and I rolled back the transaction with this C# code: catch (Exception) { TransporterService.WriteEventToWindowsLog(AppName, "Rolling Back Transaction:", ERROR); broker.Tran.Rollback(); break; } after which my target queue would continue to fill up but nothing to the external activation queue. Does the Event Notification get disabled once a transaction is rolled back? Should I have done a broker.EndDialog here when catching my exception? Also, after my event notification is disabled(if that is actually whats happening) how do I re engage it? Do I have to drop it and recreate it? Thank in advance for any help, I love Service Broker and its workign wonderfully except for this bug that I hope to fix soon.

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