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• AD, Windows-NT Authentication queries

  - by rockbala

  Need Help on the following questions. When a users login (on a computer in the network) is validated against AD what is/are the authentication method used? When a users login is validated in Windows NT environment (not AD) what is/are the authentication method used? If all user's account is on AD, is it possible to change the authentication mechanism only (or protocols) from AD to NT and vice versa (if possible)? If part/whole of question 3 is valid, where should one look to change these authentication methods ? What is the difference between AD and Windows-NT authentication ? Windows server 2008 Domain controller used. Regards, Balaji

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• Postfix block senders outside from local domains

  - by Tibor Peter Toth

  I would like to block every mail that is coming in from a domain that is running on my server. Example: I have domain1.com on my mail server and I'm getting a mail from outside with an email address of [email protected] Then I know it's a Spam, because domain1.com is on my server, so the sender cannot come from outside. I want postfix to check for this, and simply block these kind of emails. I know this is a function in postfix, just don't know which one. Thanks.

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• How to troubleshoot a remote wmi query/access failure?

  - by Roman

  I'm using Powershell to query a remote computer in a domain for a wmi object, eg: "gwmi -computer test -class win32_bios". I get this error message: Value does not fall within the expected range Executing the query local under the same user works fine. It seems to happen on both windows 2003 and also 2008 systems. The user that runs the shell has admin rights on the local and remote server. I checked wmi and dcom permissions as far as I know how to do this, they seem to be the same on a server where it works, and another where it does not. I think it is not a network issue, all ports are open that are needed, and it also happens within the same subnet. When sniffing the traffic we see the following errors: RPC: c/o Alter Cont Resp: Call=0x2 Assoc Grp=0x4E4E Xmit=0x16D0 Recv=0x16D0 Warning: GssAPIMechanism is not found, either caused by not reassembled, conversation off or filtering. And an errormessage from Kerberos: Kerberos: KRB_ERROR - KDC_ERR_BADOPTION (13) The option code in the packet is 0x40830000 Any idea what I should look into?

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• KeepLevelReg settings to eliminate sync prompts - errors occurred while Windows was synchronizing your data

  - by Detritus Maximus

  We have 2 XP pro VMs (Citrix) that both have problems with logout prompts appearing during logout. Users are closing the rdc before these appear: The Microsoft solution involves the creation of the KeepProgressLevel registry entry along with a value of 1 for "pause on errors." I have implemented this across the domain for this problem, yet these 2 VM's continue to have the prompts. Today, I experimented by changing the KeepProgressLevel option to 0. This is not one of the options given by MS, yet I stopped getting the prompts. Can anyone tell me what I've done by setting the value to 0? Have I basically turned off the feature as if the KeepProgressLevel entry is gone? If so, why no more prompts? I did notice during logoff that there is a red x and error message, yet no prompt.

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• Lookup Active Directory entry by implicit UPN

  - by Michael-O

  In our company exists a forest-wide UPN suffix company.com and almost all user accounts have the explicit UPN set to [email protected]. This value is also set in the Active Directory userPrincipalName attribute. Now we have an application where users perform authentication through Kerberos. So we are given the Kerberos principal, i.e. implicit UPN. We'd like to look up that user and retrieve several LDAP attributes. Since iUPN and userPrincipalName do not match anymore, the lookup is not possible. Is there any "official" way to retrieve a mapping from the Active Direcory? My workaround is to perform a LDAP bind against the realm component and search for the sAMAccountName attribute which matches the user id component of the iUPN. Searching for the mere sAMAccountName in the forest is not possible because the value is unique in the domain only.

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• Postfix sends email to spam (gmail, hotmail)

  - by razorxan

  I recently installed a postfix + dovecot + dkim multi domain, multi user, multi alias mail server on my debian squeeze system. Everything works except for one big issue that basically makes the whole thing useless: Every single email sent by my server goes straight into spam. (gmail, hotmail) First thing i did is doing the well known allaboutspam test and all is checked (green) except for the BATV thing (yellow): Reverse dns: green HELO Greeting: green RBL: green BATV: yellow SPF: green DKIM: green URIBL: green SPAMAssassin: green Greylist: green I'm really confused and i can't see a way to solve this issue. Ask me any detail if you need.

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• how to connect public web server to internal LAN

  - by DefSol

  I have a VPS which is my public web server for all my clients. It's running server 2008 and I would like to have it connect via secure connection to my internal LAN. I would like this to be a route so access is bi-derectional. Have read about Server & Domain isolation, but am concerned this may prevent public views to the webs sites on the server. I currently have a PPTP tunnel, but I'm wanting better security (IPSec or SSL etc) and it's not given my bi derectional access. (In fact my backups aren't copying accross but this could be an acl issue) The goal is to provide easy/automated backups of data & sql db's to my internal LAN, as well as a means to provision new sites & db's from a workflow occuring internally. Internal lan is windows based with ISA 2006 at the perimeter. Thanks

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• Virtualmin Configuration

  - by Allen

  I am trying to get Virtualmin setup and have reached a point where my noobish sysadmin skills aren't getting the job done. This is the message I get now when I try and refresh the configuration of Virtualmin. BIND DNS server is installed, and the system is configured to use it. However, the default master DNS server XXXXXX is not a fully qualified domain name. Sendmail is only accepting SMTP connections on the following ports : 127.0.0.1 port smtp. Email from other systems on the Internet will not be accepted. This can be changed in the Sendmail Mail Server module. Please advise what I need to do to get Sendmail configured properly. Thanks!

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• Samba Server needs to have AD authentication

  - by vivek

  My Linux server is connected to AD via Bind DN and password (without domain joining). It is using sssd for authentication. I am able to ssh and login without any issue. I have a proper setup of uid and guid, etc. .. There is no issue with logging to the linux server. I want the samba service to use AD accounts, but I can't find documentation for how to configure it in this case. Can anyone explain how to configure samba to use active directory for authentication on a system using sssd?

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• localhost name error with linux machines

  - by coderex

  Hi, CASE 1: I have a Ubuntu machine with name midhun.local I can access this in http://midhun.local/svn ... But its can't access from other machines(both Windows and Linux) through this host name. But it works with http://192.168.1.192/svn CASE 2: I have a another machine(windows) having the host-name myname:555 In this case i can access https://myname:555/svn from other windows machines with the same URL. But if am trying to access from the a Linux machine it will not work with the same URL instead of that https://192.1.168.111:555/svn will work. How can I solve the problem. I need to access via the same name from cross domain. How is it possible in LAN Thanks in advance!!

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• webm html5 videos lose connection with apache server

  - by Jizbo Jonez

  webm html5 videos that are played through a domain on my server sometimes lose connection. A video that is playing will start to buffer and then stop part of way through with that message "Video playback aborted due to a network error." displayed on the html5 video player. I am delivering the webm videos via a php script on an LAMP server. There doesn't seem to be any errors in the server logs. Is there any php.ini settings or httpd.conf that I need to set? I recently set 'Keep Alive" to "on" in httpd.conf could that be causing this?

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• Windows XP autostart process as administrator

  - by Zulakis

  I am looking for a way with which i can autostart a certain program on logon of a user with user-rights with administrator-rights. I already tried using task scheduler but it didn't work out because you got to enter a username with format machine\user and our pxe-image-deployment-system automatically patches the machine names so the entered domain\user stopped working. UPDATE: the runas.exe command does not seem appropiate for this task, too. If using /user:machinename\Administrator /savcred it is invalid after imaging. What one user suggested was using .\Administrator or localhost\Administrator but both didn't work on my XP SP3 machines.

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• sSMTP Configuration Question

  - by SevenCentral

  I've installed sSMTP on Ubuntu 10.04 via: sudo apt-get install ssmtp My configuration file is: # # Config file for sSMTP sendmail # # The person who gets all mail for userids < 1000 # Make this empty to disable rewriting. [email protected] # The place where the mail goes. The actual machine name is required no # MX records are consulted. Commonly mailhosts are named mail.domain.com mailhub=smtp.gmail.com:587 # Where will the mail seem to come from? #rewriteDomain= # The full hostname hostname=somedomain.com # Are users allowed to set their own From: address? # YES - Allow the user to specify their own From: address # NO - Use the system generated From: address #FromLineOverride=YES [email protected] authpass=**** usestarttls=yes Am I transmitting my credentials in clear text? Is calling ssmtp a secure operation? Thanks.

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• NLB RPC server is unavailable on the specified computer

  - by Robin Weston

  Hi guys, Firstly, I'll admit that my networking knowledge is limited so as people request more information I'll update this question accordingly. I am trying to create a NLB Cluster across 2 Windows Server 2008 Web Servers. Neither of the machines are members of a domain, and both have 2 NICs (one for processing external web traffic, and one for communicating internally). I have installed NLB on both machines, and have created a cluster on Host A and added itself to it. However, when I try and add Host B (using the address from the external NIC) I get the following error : "The RPC server is unavailable on the specified computer". On Host B I can see that the RPC service is running fine. I can also ping and RDP from Host A to Host B with no problems either. I have disabled the windows firewall on both machines but that had no effect

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• enable offline files for all users home drives via Group policy or other

  - by JohnyV

  I am trying to get all users of particular notebooks to make the users h drive offline. i know you can do it manually but is there a way to set this value somewhere so that users dont have to do it themselves? I am running 2008r2 domain controllers and windows 7 clients. I have folder redirection enabled but i want to make the users h: available to them when they are offline. I know the group policies are located in the computer configurationPoliciesadministrative templatesNetwork but there doesnt seem to be any place to select which folders/drives will be offline files without a users input. Even if there is another method not through GP. Thanks

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• Sharepoint database connection issue after upgrade to SQL Server 2008 R2

  - by Neil Hoff

  I took a backup of all our Sharepoint WSS 3.0 databases and restored them to a new Windows 2008 R2 server. The new SQL server has the same name and IP address as the old one. The only difference between the two is the new one has SQL 2008 R2 and the old one has SQL 2005. When I navigate to the sharepoint url I get this error: Cannot connect to the configuration database. I checked the logs at this location: "%commonprogramfiles%/Microsoft Shared/web server extensions/12/Logs" and found this error: System.Data.SqlClient.SqlException: Login failed. The login is from an untrusted domain and cannot be used with Windows authentication. Any ideas?

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• Windows 7 keep internet connection after IPSec established

  - by mmc18

  How I can keep internet connection after establishing IpSec connection to server? I have followed to following link to establihed IpSec server http://rootmanager.com/ubuntu-ipsec-l2tp-windows-domain-auth/setting-up-openswan-xl2tpd-with-native-windows-clients.html then following the below one to connect this server from Windows 7 machine. http://confoundedtech.blogspot.com/2012/07/windows-l2tp-ipsec-vpn-connection-to.html I am able to connect and properly sending data. But after establihing IpSec conenction, my internet conenction is dropped. How I can keep both connection alive?

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• Deliver email to Gmail AND Office 365?

  - by gbegley

  We moved our Office app hosting from Google Apps to Office 365. Many of us miss Google Apps, especially its superior search functionality. The pressure to use Office 365 has disappeared; many (but not all) of us would like to go back to Google Apps. Is it possible to configure our domain's mail delivery so that messages are delivered to both Google Apps's Gmail and Office 365, allowing users to choose which platform they prefer? If so, what are the options? Google Apps documentation specifies the ability to deliver messages to a secondary mail server using routing configuration. Currently our MX records are point to Office 365. If I change the MX records to point to Google Apps Mails servers, is the "Office 365 MX record address" the address I would want to use for a Google Apps Routing Target?

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• DNS SERVFAIL and NXDOMAIN on specific hostname

  - by David George

  I have two DNS servers in my domain, Windows 2003 and Windows 2008, but recently both are failing to route users to www.cdw.com. I have had no other complaints with any other websites, but when trying to use cdw.com the page never loads. I tried to resolve the hostname and get the NXDOMAIN error below: MyComputer:~ me$ nslookup cdw.com ;; Got SERVFAIL reply from 192.168.2.1, trying next server Server: 192.168.2.2 Address: 192.168.2.2#53 ** server can't find cdw.com: NXDOMAIN MyComputer:~ me$ nslookup serverfault.com Server: 192.168.2.2 Address: 192.168.2.2#53 Non-authoritative answer: Name: serverfault.com Address: 198.252.206.16

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• Exchange mail users cannot send to certain lists

  - by blsub6

  First of all, everyone's on Exchange 2010 using OWA I have a dynamic distribution list that contains all users in my domain called 'staff'. I can send to this list, other people can send to this list, but I have one user that cannot send to this list. Sending to this list gives the user an email back with the error: Delivery has failed to these recipients or groups: Staff The e-mail address you entered couldn't be found. Please check the recipient's e-mail address and try to resend the message. If the problem continues, please contact your helpdesk. and then a bunch of diagnostic information that I don't want to paste here because I don't want to have to censor all of the sensitive information contained (lazy) Can you guys throw me some possible reasons why this would happen? If there are an innumerable number of reasons, where should I start to troubleshoot this? EDIT One Exchange server inside the network that acts as a transport server, client access server and mailbox server and one Edge Transport server in the DMZ.

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• Port 53 UDP Outgoing flood

  - by DanSpd

  Hello I am experiencing very huge problem. I have 4 computers in network, and from each a lot of data is being sent to ISP name servers. Sometimes data is being sent a little from each computer in network, sometimes it is just a lot of data from one computer. I have antivirus (Avast) and malware scan (SpyBot) I know port 53 UDP is dns which resolves domain IP so its' needed. Also I have read that ISP name server might have been infected. So what is the best thing to do in this situation. Also sometimes internet starts to lag really because of port 53

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• What is the Best Free Linux Gateway

  - by rockinthesixstring

  I'm looking at moving away from using my DIR-825 as a gateway and moving into a Linux box to do it all for me. I've found IPCop, but I'm looking for something with a little more power. My main goal is basically to be able to point different external domain names to different internal servers. backup.example.com - 192.168.0.5 home.example.com - 192.168.0.1 I host my DNS on my own dedicated server (windows), so I don't know much about doing the gateway thing in my home (my hosting provider does it all for me). Do any of you know of any free Linux Distros that can accomplish what I'm looking for?

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• Having many subdomains with SSL--best practices?

  - by jnunn

  I have a site that has many subdomains (one for each client). The content for each subdomain will be different, pulling different data, different layouts etc, so I don't think I can just alias one directory to many different sub domains. My question is, what's the best practice for doing this? Each subdomain will need SSL. My setup is Amazon EC2 (ubuntu) Wildcard SSL for my domain (*.mydomain.com) Apache 2 PHP (LAMP) Currently, I'm just creating a new entry into "/etc/hosts" and an appropriate spot in the web root (ie /var/www/abc.mydomain.com, /var/www/def.mydomain.com, etc). I've just discovered that I'll need a unique IP for each subdomain, and that's tricky with EC2 as they limit you to the number you can have (unless you jump through some hoops). Right now I have about 10 subdomains, which is manageable, but theoretically I could have thousands. Am I doing it the only way possible or is there a better way I should investigate?

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• The security database on the server does not have a computer account for this workstation trust relationship

  - by alex

  I have a Server 2008 machine called OTTO I recently, by mistake, booted up an old machine, also called OTTO (the hardware was unstable, so the new one was set up to take it's place) I shut down the old machine, turned it off, and recycled it (it won't ever be back on) Now, whenever i try to log in to the real OTTO with the domain account (mydomain\Administrator) i get the following error: The security database on the server does not have a computer account for this workstation What can I do to fix this? It doesn't appear in active directory any more I've added it, but I'm guessing this had no effect, due to a different SID I can log in as the local administrator however

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• VPN within a VM to allow for internet access on the host

  - by David Durrant

  I have a network connection (created under Networks and Sharing) that I use to connect to a customer's site. But when I use this to connect to the site, I loose all access to the public internet, and can only access customer specific items. I want to circumvent this issue by creating a VM and then utilizing the VM to connect to the network location and interact within the customer's domain, while leaving my host machine open to the internet. I'm not extremely familiar with networking, but I have a few basic skills. Please let me know if this is possible and what the correct procedures are. I already have a VM created with VirtualBox, and both the host and guest are running Windows 7 x64. I have created duplicate VPNs already, but can only connect successfully on the host machine.

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