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• Linux - How to control Winbind Authentication cache timeout

  - by cybervedaa

  I have configured my linux machines (running CentOS 5.2) to authenticate against a Windows server running Active Directory. I have even enabled winbind offline logon. Everything works as expected, however I'm also looking to impose a TTL for the winbind authentication cache. So far all I found was the below snippet from the samba documentation winbind cache time (G) This parameter specifies the number of seconds the winbindd(8) daemon will cache user and group information before querying a Windows NT server again. **This does not apply to authentication requests**, these are always evaluated in real time unless the winbind offline logon option has been enabled. Default: winbind cache time = 300 Clearly the winbind cache time parameter does not control the cache TTL for authentication requests. Is there any other way I can implement a cache timeout for winbind authentication requests? Thank you

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• Cross domain LDAP

  - by Adam

  For a system we are developing we have 2 domains an internal and an external domain with bi directional trust between them. However the servers are only able to connect to their own DC's. We have an application server on the internal domain which needs to use an LDAP query to gather a list of users from a group on the external domain. How do i go about writing an LDAP query that asks one DC to go ask another DC for a list of users. I tried querying the internal DC with the same LDAP query I would use if it could hit the external DC directly but this does not work. When i use Softerra LDAP Administraor I can view the full hierarchy of the interal domain but despite the trust relationship between domains i am unable to see any of the external doamin. Any suggestions or help would be greatly appreciated

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• Set certain WSUS updates to auto-install

  - by Nicolas

  We're running a WSUS server for the simple purpose of caching updates. Since we are a very small network of all "power users", we've got the domain group policy for WSUS updates on the clients set to prompt for download/install. i.e. We don't want updates to install without our knowledge. But there are a few cases where it would be nice to be able to set a certain update to auto-install. e.g. Windows Defender updates, Malicious Software Removal Tool, Outlook Junk Email Filter, etc. Basically all the silly little updates that you would always install anyway and don't require a restart. Is there a way to set the general policy to prompt for download/install, but auto-install certain regular updates? P.S. WSUS itself does have the facility to auto-approve certain updates. That part works. Facts & Figures: SBS 2003 domain Windows 7 Pro clients Windows XP Pro clients

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• Ubuntu User WWW/FTP

  - by SnIpY

  I have a user named 'user' which I use to login to the ftp of my website. However, this presents me with a problem. If I want to allow my user to access to ftp, I have to typ the following: chown -R user:ftpusers /var/www/ By doing this, my website is no longer available when surfing to it. To make it available again, I have to typ the following command: chown -R www-data:www-data /var/www/ the user 'user' is in both the ftpusers and www-data group. How can I fix this so I wouldn't have to typ this anymore? I'm using apache2 and vsftpd on ubuntu

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• CentOS, sudo Doesn't Accept root Password, but Logging in as root Works

  - by nicorellius

  I am new to Linux and I have CentOS running on a dual boot system. I was trying to edit a file requiring root permissions, so I used sudo. I typed the root password and it failed. This happened three times, and the process was ended. I then logged in as root (su) and was able to navigate to the file and make changes as root. Am I missing something? How would I edit the sudoers file such that this password would work? Or is there another way to log in to the sudo group to make these changes? How do I set sudo passwords?

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• Remote Desktop session on Windows Server 2003

  - by Dels

  I have some problem when I use Remote Desktop, here some description. I set some application to autorun each time Administrator (console) was login on W2K3 SP2 server I use Remote Desktop from XP SP3, using the same login as Administrator It creates a new session with the same username and the application starts autorun which make duplicity in application I just hoping i can enforce the Remote Desktop client to connect into only one session (console session), toying with Group Policy setting, successfully enforce the one session, but whenever i close remote desktop (disconnect) the console got disconnected too (which I didn't want it to behave like that). I also try some setting to limit connection, still it doesn't behave as I want it too. Simple i just want to use 1 session, but each time we close remote desktop the session still alive, much like when we use VNC solution (RealVNC, UltraVNC, TinyVNC etc.) Any solution(s)?

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• How to manage configuration & automatic rollout of 20 virtual machines

  - by Lucas Meijer

  I have a TeamCity build server, with about 20 "build agents", both Windows and MacOS machines. Often, I need to install a newer version of XCode or VisualStudio or some other tool. Having to do this on all machines manually is boring and error prone. I'm trying to find out what is the best way to achieve the following: make it easy to change a system configuration, without having to do it on all machines manually. make it easy to add a new machine to the group. ensure the machines are as identical as possible The jobs these machines are executing is relatively heavy, fully consuming 8 cores, and be very heavy on IO. It's fine if the solution includes spending money.

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• Applications don't see mapped network drive after waking from sleep

  - by Chris

  I have a network share mapped as a drive letter on a Windows 7 PC that's part of a simple home network. When I wake the PC from sleep, Explorer sometimes says the drive is disconnected. Doubleclicking the drive connects it instantly, as far as Explorer is concerned. But some other applications don't see the drive unless I take additional steps (e.g., navigate to the drive in an "Open..." dialog). Is there any way to get the drive to be connected for all purposes immediately when resuming from standby? I've found the "Always wait for the network at computer startup and logon" item in Group Policy, but I'm not sure what the setting does or whether it would fix this problem. I have network discovery enabled and un-firewalled.

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• OpenSSH SFTP server with chroot()

  - by HannesFostie

  I am currently setting up an SFTP server but there is one detail I can't seem to figure out. When I add a user, I would like him to connect using his client and be able to write in his "root dir" right away. My Match case for the SFTP-users group currently has ChrootDirectory set as "/home/%u", and inside that directory I have to have a subdirectory owned by the user, while /home/%u itself is owned by root. Next to that, the "root dir" also has a couple files, .bashrc to name one. Is it possible to put these files somewhere else, remove them, or at least make them invisible to the user? Thanks

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• Failed to Upload a File

  - by CrazyNick

  User 'X' is the site-collection owner. He tries to upload a 500kb file into a document library, got the error "The server has aborted your upload. The files selected may exceed the server's upload size limit. If you are transfering a large group of files, try uploading fewer at a time." however web-application owners are able to upload the file. what would be the issue, any thoughts? Upload size limit for a file – 5 MB Site Quota template set – 50 MB Used Site Quota – 10 MB

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• Send mail from a distrobution groups email address

  - by Campo

  A user has send permission on a distro group on a WINDOWS SERVER 2003 domain. I am the admin. When either of us send email using the distrobution groups email adress we get a non delivery report Your message did not reach some or all of the intended recipients. Subject: TEST Sent: 4/19/2010 4:46 PM The following recipient(s) cannot be reached: [email protected] on 4/19/2010 4:46 PM You do not have permission to send to this recipient. For assistance, contact your system administrator. MSEXCH:MSExchangeIS:/DC=local/DC=DOMAIN:SERVERNAME Thanks, JC

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• All my files uploaded have unusable permissions

  - by cosmicbdog

  I've just moved to a new server and have come across some strange permissions issues. Every file I upload has permissions of 600, owned by the user account and is also in the same group. With this permission, the server is unable to make changes to these files. The folder I'm uploading to (via regular ftp) has permissions of 755. Why are any new files I upload here given this permission of 600? And how do I change it so that files added are given permissions so they can be modified by the webserver?

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• mysql master slave "table already exists" but table not exists

  - by Korjavin Ivan

  I have 1 master mysql process, and 2 slave. Today on both slaves i see : Error 'Table 'bgbilling.contract_status_balance_dump' already exists' on query. Default database: 'bgbilling'. Query: 'CREATE TABLE contract_status_balance_dump( UNIQUE(cid) ) SELECT cid, MAX(yy*12+(mm-1))%12 + 1 AS mm,FLOOR(MAX(yy*12+(mm-1)) / 12) AS yy FROM contract_balance GROUP BY cid' "show tables" does not show this table. I tryed stop slave , and do "drop table contract_status_balance_dump" but: ERROR 1051 (42S02): Unknown table 'contract_status_balance_dump' How its possible? And how fix that?

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• Windows Scheduled Tasks losing password configuration

  - by E Brown

  I have a couple of jobs scheduled to run daily on a customer server running Windows Server 2003 Standard Edition, SP1 using Windows Scheduled Tasks. The tasks are set to run as a user that is in the Administrators group, and were scheduled as that same user. The password of that user is set to never expire. These tasks fail to run pretty much every day. Going into Scheduled Tasks and attempting to run the tasks manually indicates that the password is incorrect. I go into the task properties, retype the password into the appropriate fields, click OK, and attempt to run the task manually again. Now it works fine. What might be the cause of the password being lost like this? These same tasks are running on other customers servers with no problems. Thanks in advance for any thoughts.

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• Move files and resize partition automatically?

  - by Rob

  I'm in a bit of an odd situation. I've recently been working on switching from debian to arch, and I've got my home partition for both pointing to the same partition (different usernames, so that's not an issue). What I want to do is one of two things, either: Set up user on arch with same username and group as debian, and have everything just sort of work! OR Move files I'd like to share between home folders to their own partition, and mount it with fstab. For the second one, I have around 150gb of files that would need moved to their own partition, and i've got about 15gb of free space on my home partition. So what I'd want to do is somehow make a 10gb ext4 partition, move 10gb-ish of files, expand the partition again, move files again, etc until all the files are moved to their own partition. I can do it manually, but it'd be easier if I could say "Move 10GB-ish of files from here to there, and then resize it and repeat until I'm out of files". Is that even possible?

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• NetApp erroring with: STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT

  - by Sobrique

  Since a sitewide upgrade to Windows 7 on desktop, I've started having a problem with virus checking. Specifically - when doing a rename operation on a (filer hosted) CIFS share. The virus checker seems to be triggering a set of messages on the filer: [filerB: auth.trace.authenticateUser.loginTraceIP:info]: AUTH: Login attempt by user server-wk8-r2$ of domain MYDOMAIN from client machine 10.1.1.20 (server-wk8-r2). [filerB: auth.dc.trace.DCConnection.statusMsg:info]: AUTH: TraceDC- attempting authentication with domain controller \\MYDC. [filerB: auth.trace.authenticateUser.loginRejected:info]: AUTH: Login attempt by user rejected by the domain controller with error 0xc0000199: STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT. [filerB: auth.trace.authenticateUser.loginTraceMsg:info]: AUTH: Delaying the response by 5 seconds due to continuous failed login attempts by user server-wk8-r2$ of domain MYDOMAIN from client machine 10.1.1.20. This seems to specifically trigger on a rename so what we think is going on is the virus checker is seeing a 'new' file, and trying to do an on-access scan. The virus checker - previously running as LocalSystem and thus sending null as it's authentication request is now looking rather like a DOS attack, and causing the filer to temporarily black list. This 5s lock out each 'access attempt' is a minor nuisance most of the time, and really quite significant for some operations - e.g. large file transfers, where every file takes 5s Having done some digging, this seems to be related to NLTM authentication: Symptoms Error message: System error 1808 has occurred. The account used is a computer account. Use your global user account or local user account to access this server. A packet trace of the failure will show the error as: STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT (0xC0000199) Cause Microsoft has changed the functionality of how a Local System account identifies itself during NTLM authentication. This only impacts NTLM authentication. It does not impact Kerberos Authentication. Solution On the host, please set the following group policy entry and reboot the host. Network Security: Allow Local System to use computer identity for NTLM: Disabled Defining this group policy makes Windows Server 2008 R2 and Windows 7 function like Windows Server 2008 SP1. So we've now got a couple of workaround which aren't particularly nice - one is to change this security option. One is to disable virus checking, or otherwise exempt part of the infrastructure. And here's where I come to my request for assistance from ServerFault - what is the best way forwards? I lack Windows experience to be sure of what I'm seeing. I'm not entirely sure why NTLM is part of this picture in the first place - I thought we were using Kerberos authentication. I'm not sure how to start diagnosing or troubleshooting this. (We are going cross domain - workstation machine accounts are in a separate AD and DNS domain to my filer. Normal user authentication works fine however.) And failing that, can anyone suggest other lines of enquiry? I'd like to avoid a site wide security option change, or if I do go that way I'll need to be able to supply detailed reasoning. Likewise - disabling virus checking works as a short term workaround, and applying exclusions may help... but I'd rather not, and don't think that solves the underlying problem. EDIT: Filers in AD ldap have SPNs for: nfs/host.fully.qualified.domain nfs/host HOST/host.fully.qualified.domain HOST/host (Sorry, have to obfuscate those). Could it be that without a 'cifs/host.fully.qualified.domain' it's not going to work? (or some other SPN? ) Edit: As part of the searching I've been doing I've found: http://itwanderer.wordpress.com/2011/04/14/tread-lightly-kerberos-encryption-types/ Which suggests that several encryption types were disabled by default in Win7/2008R2. This might be pertinent, as we've definitely had a similar problem with Keberized NFSv4. There is a hidden option which may help some future Keberos users: options nfs.rpcsec.trace on (This hasn't given me anything yet though, so may just be NFS specific). Edit: Further digging has me tracking it back to cross domain authentication. It looks like my Windows 7 workstation (in one domain) is not getting Kerberos tickets for the other domain, in which my NetApp filer is CIFS joined. I've done this separately against a standalone server (Win2003 and Win2008) and didn't get Kerberos tickets for those either. Which means I think Kerberos might be broken, but I've no idea how to troubleshoot further. Edit: A further update: It looks like this may be down Kerberos tickets not being issued cross domain. This then triggers NTLM fallback, which then runs into this problem (since Windows 7). First port of call will be to investigate the Kerberos side of things, but in neither case do we have anything pointing at the Filer being the root cause. As such - as the storage engineer - it's out of my hands. However, if anyone can point me in the direction of troubleshooting Kerberos spanning two Windows AD domains (Kerberos Realms) then that would be appreciated. Options we're going to be considering for resolution: Amend policy option on all workstations via GPO (as above). Talking to AV vendor about the rename triggering scanning. Talking to AV vendor regarding running AV as service account. investigating Kerberos authentication (why it's not working, whether it should be).

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• Does multiple files in SQL Server when using RAID help reduce conflicts in growth and file-locking?

  - by Dr Giles M

  I've been reading around and get the impression that if you are using RAID then using multiple SQL Server files within a filegroup won't yeild any more improvements, and the benefits are purely administrative (if you started to run out of space or wanted to partition off data into managable chunks for backups/balancing the data around your big server room). However, being a reasonably savvy software person, it's not unthinkable to hypothesise that, even for smaller databases that SQL Server will perform growth and locking operations (for writes) on a LOGICAL file basis, so even if you are using RAID, it seems to make sense to have multiple files in a file group to balance I/O, or does the time taken to reconstruct the data from distributed filegroups outweigh the benefits of reduced locking? I'm also aware that the behaviour and benefits may be different for tables/indeces/log. Is there a good site that distinguishes the benefits of multiple files when RAID is already in place?

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• Remote desktop sessions - Unwanted automatic log off after period of time

  - by alex

  I'm having an issue whenever I connect to any of our servers via RDP - After a certain period of time, it seems to close these sessions, closing all the applications i had open etc... This is particularly annoying if I am running a long process - for example, copying a file - it cuts it off... I then re-connect via RDP, and it effectively loads a new session. Is this set somewhere in Group Policy? Or somewhere else? This is happening on Windows 2008 (it may also be on our 2003 servers, although I haven't noticed...)

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• Setting Mercurial with Active Directory authentication and authorisation

  - by jbx

  I am evaluating the possibilities of moving my organisation to Mercurial, however I am stumbling on 2 basic requirements which I can't find proper pointers to. How do I set up Mercurial's central repository to authenticate users with the central active directory and only allow them to push or pull if they have the right credentials? How do I set up a Mercurial project repository to only allow users pertaining to a specific group to push / pull source code? We need this to have per-project authorisation. On which HTTP servers (IIS or Apache etc.) are the above 2 requirements supported? Apologies if I am asking something obvious or if I am missing something fundamental about how authentication and authorisation works. Thanks.

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• Files listed by bash but unaccessible

  - by Cerin

  What would cause the following behavior on an Ubuntu 12.04 system? I've SSHed into a machine as the "ubuntu" user. Running ls -lah /data/* shows dozens of non-empty files (e.g. file1.txt, file2.txt, etc), all owned by the "ubuntu" user/group, and with full read/write access. If I try to cat /data/file1.txt, bash gives me the error "cat: /data/file1.txt: No such file or directory" In short, ls is listing files, but in every other way, the files essentially don't exist. I can't cat them or read them in any way. Even giving all the files 777 permission doesn't change anything. This is really bizarre. What's going on here?

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• vCenter Server: This host currently has no management network redundancy

  - by goober

  Background I'm on a new VMWare install consisting of: 1 vCenter Server (containing inventory service, SSO, vCenter server, and web client server) 2 ESX Servers configured in a HA group Problem When a I view the summary for any one of my servers, I receive a notice: "" This is expected in our scenario and we're okay with it. Attempted Solutions As I understand from this article and this discussion, the proper way to remove the error message is to ignore it via setting the "das.ignoreRedundantNetWarning" propery to "true". I took the following steps: Logged into vCenter Right-clicked on my HA cluster and chose "Edit Settings..." Clicked "vSphere HA" section Clicked "Advanced Options..." Added the "das.ignoreRedundantNetWarning" option with a value of "true". Question How do I get this error to go away, and are there any reasons why adding this option may not have worked? References Network redundancy message when configuring VMware High Availability in vCenter Server [VMWare KnowledgeBase] How remove a notice " has no management network redundant" [VMWare Community]

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• Losing WLAN connections but maintaining internet connections on WIndows 7 Workgroup

  - by Di

  I have 4 computers all running Windows 7 networked in a Work group through Billion 7404vgp-m wireless router.All drivers and firmware for wireless adapters and router are up to date. Windows Firewall and Defender disabled.Disconnected ipv6. Running Nod 32 anti virus software. All have own static IP address 192.XXX.X.XXX. When I Reset the router all computers have Internet and LAN access for about 1 hour and then they will lose the LAN connection but maintain Internet connection. Resetting wireless adapters or restarting computers does nothing to fix this but resetting router will. What is causing this and how do I fix it. Thanks Di

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• VPN/AFP server for centralized TimeMachine backups

  - by Keith Johnson

  I am a sysadmin for a small group of about 7 people who prefer Apple machines for their work. These machines are currently either a) not backed up at all, or b) backed up using Retrospect(Which I'm not very fond of). I don't really have the budget for anything fancy, and I'd like to keep it as user friendly as possible. Ideally I am thinking of a VPN server they can connect to(to keep the traffic secure, and because they work from home frequently) along with an AFP server for use with TimeMachine. The goal would be to get better backup coverage, along with user-initiated restores and overall ease of use. Does this seem like a reasonable idea? Has anyone done this before? Are there any obvious problems I've overlooked?

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• Linux - Debian - Original groups that a user is in

  - by Auxiliary

  This is embarrassing; I used the usermod command to add myself to the disk group. However I forgot to use the append option! so I'm not a member of any of the groups that I was originally, now terminal says that I'm not even a sudoer (How rude!). So the question is: What are the original groups that a normal Administrator type of user is in? BTW, I am using Linux Mint Debian Edition (LMDE). Any help is appreciated.

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• How to get Windows 7 logon wallpaper to tile to other monitors?

  - by Oskar Duveborn

  In 2000/XP/Vista it was easy to set a wallpaper for the logon screen, either manually through tools like Logonstudio or simple registry changes by hand on prepared installation images or through custom group policies. In Windows 7 all this works as usual, but the secondary (or any additional) monitor is just black. The mouse pointer is visible on it but no matter what settings I can't get the wallpaper to tile (or stretch or fill or whatever) over onto it. This makes it hard to OEM/company brand the installation for multi-monitor users. More annoying is the fact that it looks officially supported to brand the logon wallpaper in Windows 7 - as it's made extremely easy... apart from this little catch.

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