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• Is anyone using KVM in production?

  - by Andy Shellam

  I've been trying to set up a pair of servers utilising KVM on Ubuntu 9.10 to host 8 virtual machines between them and ended up with various issues from the VMs freezing, to not powering on. I had one virtual server set up and running and was setting up a second, when any operation involving OpenSSL would cause the VM to lock up in a weird way - all network traffic would cease, it wouldn't process logins on the console, but it wasn't taking any CPU time off the host. The first virtual server was identical and worked perfectly. Another VM I tried to setup had installed Ubuntu fine then refused to reboot, throwing kernel exceptions to do with XFS. I've now installed Citrix XenServer 5.5 on both hosts, and am now setting up my third VM with absolutely no issues. I also had the same experience when I tried VMware, but I preferred Xen as it appears to give more features on the free license. My question is am I just unlucky with KVM, or is KVM as unstable as it appears? Are you using, or planning on using, KVM in production, and how successful have you been?

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• Unconvert Text File from Binary Format

  - by Hammer Bro.

  I've got a rather large CSV file (~700MB) which I know to consist of lines of 27-character alpha-numeric hashes; no commas or anything fancy. Somehow, during its migration from Windows to Linux (via winSCP and then a few regular SCPs), it has converted into some kind of binary format I am unfamiliar with. If I open the file in vi, everything appears fine, and it says [converted] at the bottom, although I know it's not a line endings issue (and dos2unix doesn't help). If I 'head' the file, it looks proper except for a "ÿþ" at the beginning of the first line. If I open up the file in nano, however, I see the "ÿþ" at the start and then "^@" before every character (even newlines and EoF). If I try to re-save or copy the file (say via: head file.csv short.txt), this special encoding is preserved. I copied the first ten lines out of vi (which displays it properly) into my Windows clipboard via my SSH client, then pasted it into a new text file, test.txt. This file is visually identical when opened in vi (and similar through 'head', minus the "ÿþ"), although it's roughly half of the filesize. Additionally, file test.txt test.txt: ASCII text file short.txt short.txt: I have no idea what format this once-text file got converted to (it's notoriously hard to search the internet for symbols), but surely there must be some way to convert it back. Any ideas?

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• Static routing on a TP-Link TL-WR1043ND

  - by igor

  My home network setup looks like this: Both routers are TP-Link TL-WR1043ND routers. The basement router handles all devices in the house that are connected via cable, handing out addresses for the 10.89.49.0/24 network via DHCP. Wireless doesn’t really work from the basement, as the signal is too weak, so I have disabled it. To do WiFi, I have added a second (identical) router downstairs. On the WAN side it is assigned the 10.89.49.101 IP address from the basement router, and on its LAN it provides the 10.89.7.0/24 network. Basic internet access works flawlessly from any device this way. I am now facing the problem that I am not able to communicate (e.g. SSH) between all devices, wired or wireless. I am able to connect from a wireless device to a wired device, for example SSH-ing from 10.89.7.X to 10.89.49.Y, but it doesn’t work the other way round—despite the fact that I have added a static route to the basement router: Does anybody have any idea on how to solve it? Both routers have already been upgraded to use the most recent firmware from TP-Link.com (Build 110429), to no avail. Errata: I would like to stick with the official firmware, switching to something like DD-WRT or OpenWrt only as a last resort.

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• Drive XML returning Windows Volume Shadow Service Error

  - by Ssvarc

  I'm trying to image a SATA laptop hard drive, using DriveImageXML, that is attached to my computer via a USB adapter. I'm running Win7 Ultimate 64 bit. DriveXML is returning: Could not initialize Windows Volume Shadow Service (VSS). ERROR C:\Program Files (x86)\Runtime Software\Drivelmage XML\vss64.exe failed to start. ERROR TIMEOUT Make sure VSSVC.EXE is running in your task manager. Click Help for more information. VSSVC.EXE is running in Task Manager, as is VSS64.exe. Looking at the FAQ on the Runtime webpage this turned up: Please verify in Settings-Control Panel-Administrative Tools-Services that the following services are enabled: MS Software Shadow Copy Provider Volume Shadow Copy Also make sure you are able to stop and start these services. Possible reasons for VSS failures: For VSS to work, at least one volume in your computer must be NTFS. If you use only FAT drives, VSS will not function. The required NTFS volume does not need to be identical with the volume you want to image. You should make sure that VSSVC.EXE is running in your task manager. If the problems persist, registering "oleaut.dll" and "oleaut32.dll" using "regsvr32" might help. Both of those services are running and can be started and stopped without issue. Using "regsvr32" to register ""oleaut32.dll" returns successful, but "oleaut.dll" returns: The module "oleaut.dll" failed to load. Make sure the binary is stored at the specified path or debug it to check for problems with the binary or dependent .DLL files. The specified module could not be found. Some other information that might be relevant. Browsing to the drive is successful, but accessing certain folders returns an "access" error. Windows runs a permissions adder that adds the current user profile to the NFTS permissions. Could this be the cause of the issue? DriveImage XML is running as Administrator. Thoughts?

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• Occasional "Could not load file or assembly" in asmx WebService on IIS and DFS

  - by user8804

  We have a handfull of ASMX web service hosted on two identical Windows Server 2003 boxes. The virtual directory for the web services is loaded in a DFS share, both servers point to the same share. We have a load balancer between the internet and the two web servers. At a seemingly random interval (right now about twice per week) when a user tries to access a method on the web service, IIS returns the error: "Could not load file or assembly" for one of the assemblies used in the method call, and will continue reporting it each time the method is called until the app pool is recycled. We haven't found any distinguishable pattern to the problem. This is what I know: the missing assembly varies (but it's always a home-brew assembly) the Web Service method that fails varies there is no noticeable pattern to the times or intervals where the problem appears there are no admin users accessing the servers when the problem appears the failing method will work correctly on one server and fail on the other, even though both point to the same bin folder the problem can always be corrected by recycling the app pool and making no other changes I have enabled the Assembly Binder Log, and know that the binder is looking in the correct location for the file. Our assemblies are compiled for .Net 3.5.

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• mdadm cron job sends email that cron has run

  - by Andrew

  I've got an Ubuntu 8.04 server using mdadm to create several RAID1 arrays. I created /etc/cron.hourly/mdadm as follows: #! /bin/sh set -e mdadm --monitor /dev/md0 /dev/md3 /dev/md4 --oneshot (Yes, the array numbers are not sequential, and I'm not using --scan beacuse I have a degraded array that may or may not have been used as swap and I can't delete, but I think that's a separate issue. If it's the underlying cause of this, I need to fix it.) mdadm sends me email (configured in the /etc/mdadm/mdadm.conf) on DegradedArray etc. events. This is the desired behaviour. What is not desired, and I can't work out, is why cron is sending me (relatively pointless) emails, via an alias in /etc/aliases: From: root@<hostname> (Cron Daemon) To: root@<hostname> Subject: Cron <root@<hostname>> cd / && run-parts --report /etc/cron.hourly Content-Type: text/plain; charset=ANSI_X3.4-1968 X-Cron-Env: <SHELL=/bin/sh> X-Cron-Env: <PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin> X-Cron-Env: <HOME=/root> X-Cron-Env: <LOGNAME=root> Message-Id: <id@hostname> Date: Fri, 7 May 2010 13:17:01 +0930 (CST) /etc/cron.hourly/mdadm: mdadm: Monitor using email address "<root_alias@domain>" from config file I've got a dozen other servers behaving correctly (mdadm sends email, cron doesnt') with identical /etc/crontab files: # /etc/crontab: system-wide crontab # <snip comments> SHELL=/bin/sh PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin # m h dom mon dow user command 17 * * * * root cd / && run-parts --report /etc/cron.hourly <snip anacron jobs> Should I simply remove the --report, or is there something else in my cron config somewhere causing this?

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• ZFS + FreeBSD + virtualbox

  - by John

  Hi, I'm configuring a FreeBSD server hosting virtualbox serving half dozen mission critical busy mail servers. I just learned ZFS, I'm quite attracted, but have a few questions: what is the CPU overhead of ZFS? I googled and found little (or no) benchmark for that. from what I learned, when ZFS updates files, it keeps the old file as snapshot, and write the updated part for the new version. However that would mean for each snapshot it keeps that require significant storage overhead. How much is this storage overhead? For example, suppose I have 2TB usable space, how much space can actually be used for the latest version of files one year later? is FreeBSD with ZFS hosting virtualbox serving half dozen busy guest mission critical mail servers a reasonable combination? Anything particular to be careful with? And can I still choose ZFS for the guest OSs? This is because I may build another identical such box for redundancy, and will need to do some mirroring between each pair of the guest systems across the boxes. I'm trying to configure a Dell R710 for this. From what I learned, I shouldn't choose any RAID at all, is that true? In that case, are the drives still arrive hot swappable? this may sounds a bit pathetic, but since I have no experience with ZFS at all, and this is a mission critical server, so just ask just in case: I'm choosing twin Intel L5630 processors, and 6 x 600GB 15K RPM Serial-Attach SCSI drives. If I need more space in the future, I would just hot swap some drivers with larger capacity to expand the storage. There is no problem with these, right?

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• Does any Certificate Authority support both SAN and wildcards?

  - by nicholas a. evans

  My basic quandry is that wildcard certificates don't support subdomains of subdomains, nor do they help with alternate domain names. Basically, if my CN is example.com, I want a Subject Alternative Name field that looks roughly like so: DNS:example.com DNS*.example.com DNS:*.beta.example.com DNS:example.net DNS:*.example.net DNS:*.beta.example.net Using a self-signed cert, I verified that the browsers will work just fine with this. Unfortunately, none of the Certificate Authorities that I looked into (Thawte, GoDaddy, Verisign, Digicert) seemed to support both wildcard certs and Subject Alternative Name (sometimes referred to as "Multiple Domain UCC"). I even called up GoDaddy tech support to confirm. Is there a CA (trusted by 99% of browsers) that supports wildcards for the Subject Alternative Name? One little restriction: I'm saddled with Amazon EC2's single Elastic IP per instance limitation. Here are what I see as my backup plans: set up three extra EC2 instances, each configured for a different IP address and cert, and nginx reverse proxy from three of them into the app server(s) introduces latency(?), and even the cheapest EC2 instance isn't that cheap instead of dedicated reverse proxy instances, setup the four or more almost identical EC2 app servers, with nginx using the port to determine which cert to deliver, and use haproxy to distribute the traffic amongst themselves. complicated to configure and manage? I'm not using the cheapest EC2 instance type for my app servers. If I don't need 4+ app servers for the load, it raises the cost. set up an external server (outside of EC2) that doesn't have EC2's Elastic IP address restrictions, setup all of the alternate IP addresses and certificates on that server, and nginx reverse proxy from that server into the EC2 app servers. extra IP addresses are almost free (still need to pay for the server of course), but don't come with the robust "elasticity" that Amazon's Elastic IPs provide. even more latency than in the first scenario. Are these approaches crazy or reasonable? Do you have another one to suggest?

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• Internal disk not correctly recognised by Windows 7

  - by david

  i'm having problems configuring a disk in a brand new, clean windows-7 install. here are some system specifics- . disk- western digital velociraptor wd6000hlhx . mobo- gigabyte z77x-ud3h . bios sata-mode set to ahci [not raid], w/disk connected to sata0 [6gb/s hi-speed sata]. . windows 7 enterprise sp1 x64 the disk is recognized by bios and correctly identified [name & size ok]. the disk is also recognized by windows on a h/w level, but it won't show up in the explorer. windows reports the device is working correctly. windows disk manager shows the drive, but says it's uninitialized and has no partitions [which is incorrect]. if i try to initialize the drive, windows throws an error saying that it "cannot find the file specified". [which file???] before connecting the drive to the new machine, i partitioned and formatted the disk under windows xp sp2, giving it 2 partitions [mbr, not gpt] and copying over a boatload of data. obviously none of this appears under windows 7. removing the disk from the new machine and replacing it back in the windows xp machine shows the disk and all data are intact and functional. i'd like to have windows 7 recognize the disk w/o having to lose the data and start over. is this possible? if so, how would i do that? I checked this post, but even though the problem seems identical, the information didn't help. any help appreciated. thanks!

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• Windows 7: Touch gestures in IE not working without explorer.exe being run once

  - by Michael

  Details: Internet Explorer 9 and Windows 7 Professional, running on a HP TouchSmart (touch screen PC). It is going to be a kiosk PC (running a custom GUI for displaying websites). Scenario 1: When running Internet Explorer as a normal program in Windows 7, touch functions work perfectly. I can scroll the website by dragging it with my finger, I can pinch zoom and I can touch-and-hold right click. I now change the default shell in Windows to Internet Explorer (ie. IE starts instead of explorer.exe). Internet Explorer of course starts up when logging in. However, touch functions are reduced to basic clicking (no dragging, no pinch zooming, no touch-and-hold right click). Then I manually start explorer.exe, and the touch functions work again! And here is the weird part: When I kill explorer.exe, the touch functions keeps working - even if I close IE and start a new instance. Scenario 2: The exact same, but instead of changing the default shell to Internet Explorer, I change it to my own program, which uses an embedded Internet Explorer ("WebBrowser"). Same thing happens. What I've tried: Autorun programs: When explorer.exe launches, it launches all the autorun programs. There are no relevant programs being run by explorer, but just in case, I have manually started all the autorun programs, so that it is identical (but without explorer.exe) to a normal login. It still does not work (until I launch explorer.exe). Specifically TabTip.exe, TabTip32.exe and wisptis.exe are all running. All services are also started. To sum it up Running explorer.exe once changes something in the touch capabilities of Internet Explorer. It doesn't matter if explorer.exe is running - as long as it has been run once. Does anyone know what causes this behavior? Or how I can circumvent it neatly? Thanks!

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• Create SAMBA node trust relationship to Windows 2003 PDC server

  - by Rod Regier

  I am having problems creating a trust relationship between an OpenVMS/IA64 node running V/IA64 8.3-1H1, TCPIP 5.6 ECO 5, CIFS 1.1 ECO1 PS11 (SAMBA 3.0.28a) and Windows 2003 server running as a PDC. I do have two other OpenVMS/Alpha nodes running V/A 8.3, TCPIP 5.6 ECO 4, CIS 1.1 ECO1 PS10 (SAMBA 3.0.28a) with working trust relationships to the same Windows 2003 server. Looking for assistance in resolving the trust "handshake". \\ Details from failing node. Unless otherwise noted, corresponding files on working nodes are similar or identical. SMB.CONF extract: [global] server string = Samba %v running on %h (OpenVMS) workgroup = WILMA netbios name = %h security = DOMAIN encrypt passwords = Yes name resolve order = lmhosts host wins bcast Password server = * log file = /samba$log/log.%m printcap name = /sys$manager/ucx$printcap.dat guest account = DYMAX print command = print %f/queue=%p/delete/passall/name="""""%s""""" lprm command = delete/entry=%j map archive = No printing = OpenVMS net rpc testjoin [2010/08/13 16:09:28, 0] SAMBA$SRC:[SOURCE.RPC_CLIENT]CLI_PIPE.C;1:(2443) get_schannel_session_key: could not fetch trust account password for domain 'WILMA' [2010/08/13 16:09:28, 0] SAMBA$SRC:[SOURCE.UTILS]NET_RPC_JOIN.C;1:(72) net_rpc_join_ok: failed to get schannel session key from server W2K3AD2 for domain WILMA. Error was NT_STATUS_CANT_ACCESS_DOMAIN_I NFO Join to domain 'WILMA' is not valid net rpc join "-Uaccount%password" tdb_open_isam: error verifying status of file SAMBA$ROOT:[PRIVATE]secrets.tdb tdb_open_isam: errno value = 1 [2010/08/13 16:21:13, 0] SAMBA$SRC:[SOURCE.PASSDB]SECRETS.C;1:(72) Failed to open /SAMBA$ROOT/PRIVATE/secrets.tdb [2010/08/13 16:21:13, 0] SAMBA$SRC:[SOURCE.UTILS]NET_RPC.C;1:(322) error storing domain sid for WILMA tdb_open_isam: error verifying status of file SAMBA$ROOT:[PRIVATE]secrets.tdb tdb_open_isam: errno value = 1 [2010/08/13 16:21:13, 0] SAMBA$SRC:[SOURCE.PASSDB]SECRETS.C;1:(72) Failed to open /SAMBA$ROOT/PRIVATE/secrets.tdb [2010/08/13 16:21:13, 0] SAMBA$SRC:[SOURCE.UTILS]NET_RPC_JOIN.C;1:(409) error storing domain sid for WILMA Unable to join domain WILMA. \\ Example from other node: net rpc testjoin Join to 'WILMA' is OK

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• Verification of files on backup media - after the backup

  - by Greg Sansom

  I have a system in place where I back up my work files daily to a portable hard drive. I actually have two portable hard drives - one is stored off-site and I swap them regularly. I also keep my family photos and other historical files backed up, but I only back the photos up occasionally (ie when I have new photos). The backup media is for backup only, and it is unlikely I will ever read the files from the backup media unless a disaster occurs and I lose the master. It worries me that my backed up files could become corrupt without me knowing it. It is also feasible that my master files could become corrupt, and eventually the corrupt files would be replicated to the backup media. I'm currently using Cobian Backup, but I'm open to alternatives. Is there a tool I can use to confirm that the backed up files are identical to the files that were first copied? I know it would be possible to generate a checksum and periodically validate the backup files against the original checksum, but I'm looking for a tool which will do this automatically.

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• Wifi Drops Connections with WPA2-PSK

  - by graf_ignotiev

  I run a small computer lab made up of 10 computers of identical hardware and software (Dell Latitudes with Windows 7 x64 Enterprise) and I use a ZyWALL 2WG as a router/firewall. Nine of the computers connect to the router over wifi using WPA2-PSK encryption while the last one is connected by ethernet cable. I'm having a problem where any computer connected to the wi-fi occasionally drops off the network (it cannot be pinged and the client cannot ping the gateway). It only happens on the wifi side and only when the encryption is WPA2-PSK or WPA-PSK. I tried using another router with a different make and model and had no problems. Thinking it could be a software error, I reset the router to factory defaults and installed the newest firmware (V4.04(AQI.8) | 04/09/2010), but still have the problem. The 802.1X log gives the following error User logout because of user disassociation. with this note WPA2-PSK:00242c582ece:logout where 00242c582ece is the mac address of the device. At this point I'm out of things to try and leads to follow. It looks like this user had the same or similar problem, but none of those proposed solutions work for me.

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• 2 Server FC SAN Configuration

  - by BSte

  I have 2 identical servers: -48GB Ram -8GigE NIC's -2FC NIC's -2x72GB RAID1 Hard Drives -Server 2008R2 Host I also Have a Fibre Channel SAN: -16x146GB RAID10 Hard Drives -2xDual-port FC Controllers (Controller A and B both have ports 1 and 2) -Server 1 has Fiber to Ports A1 and B1 -Server 2 has Fiber to Ports A2 and B2 -I kept the default config with 1 Virtual Disk and 1 Volume -The default mappings show ports A1,A2,B1,B2 on LUN 0 with read-write My goal is: -2xVM's with IIS and Guest Level Failover -2xVM's with SQL 2008 Enterprise using a Single DB and Guest Level Failover -1xVM that is an application server, preferable with Host Failover. From what I read, this will also need AD for clustering to work. -I need at least 1 VM always running for IIS and the SQLDB. This includes hardware failover and application (ie: reboot a VM for Critical updates) I was told I could install the VM's and run them from the SAN, and this is what I've tried: Installed MPIO and HyperV on Server1 and Server 2 Added the SAN as Disk E: on both servers, made it GPT and formatted NTFS Configured HyperV on both server to store use E:\VD and E:\VHD On server1, I was able to install 3 VM's on the SAN and all worked well. On server2, I would start installing the other 2 VM's, but always at some point the VM's would get a corrupt .VHD message (either server). Everything I found about the message typically related to antivirus, so I removed all antivirus on both Host servers (now only running 2008R2). I reformatted drive E: (SAN), recreated the VHD and VD directories, installed 3 VM's on Server 1, and then had the same issue when installing VM's on Server2. Obviously something is wrong, but I'm not certain what exactly. My questions: 1) Are my goals possible with this hardware setup? -I've read 2008R2 supports FC SAN's, but a lot of articles seem to only give examples with iSCSCI setups 2) What would be the suggested route on setting up the SAN (disks,volumes,LUN's)? I've worked with HyperV on a single machine before and never had issues. Actual experience working on SAN's and clustering is new to me. Any suggestions or recommendations to get me in the right direction would be much appreciated.

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• How to avoid intrusion detection/anti spoofing issue on a sonicwall TZ series FW

  - by Ian

  We have a sonicwall tz series FW with two internet service providers connected. One of the providers has a wireless service which works a bit like an ethernet switch in that we have an ip with a /24 subnet and the gateway is .1. All other clients on the same subnet (say 195.222.99.0) have the same .1 gateway - this is important, read on. Some of our clients are also on the same subnet. Our config: X0 : Lan X1 : 89.90.91.92 X2 : 195.222.99.252/24 (GW 195.222.99.1) X1 and X2 are not connected, other than both being connected to the public Internet. Client config: X1 : 195.222.99.123/24 (GW 195.222.99.1) What fails, what works: Traffic 195.222.99.123 (client) <- 89.90.91.92 (X1) : Spoof alert Traffic 195.222.99.123 (client) <- 195.222.99.252 (X1) : OK - no spoof alert I have several clients with IPs in the 195.222.99.0 range and all provoke identical alerts. This is the alert I see on the FW: Alert Intrusion Prevention IP spoof dropped 195.222.99.252, 21475, X1 89.90.91.92, 80, X1 MAC address: 00:12:ef:41:75:88 Anti-spoofing is switched off on my FW (network-mac-ip-anti-spoofing - config for each interface) for all ports I can provoke the alerts by telneting to a port on X1 from the clients. You can't argue with the logic - this is suspicious traffic. X1 is receiving traffic with a source IP which corresponds to X2s subnet. Anyone know how can I tell the FW that packets with a src subnet of 195.222.99.0 can legitimately appear on X1? I know whats going wrong, I've seen the same thing before, but with higher end FWs you can avoid this with a few extra rules. I can't see how to do this here. And before you ask why we're using this service provider - they give us 3ms (yep 3ms, thats not an error) delay between routers.

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• Why do weekly tasks created via PowerShell using a different user fail with error 0x41306

  - by Danny Tuppeny

  We have some scripts that create scheduled jobs using PowerShell as part of our application. When testing them recently, I noticed that some of them always failed immediately, and no output is ever produced (they don't even appear in the Get-Job list). After many days of tweaking, we've managed to isolate it to any jobs that are set to run weekly. Below is a script that creates two jobs that do exactly the same thing. When we run this on our domain, and provide credentials of a domain user, then force both jobs to run in the Task Scheduler GUI (right-click - Run), the daily one runs fine (0x0 result) and the weekly one fails (0x41306). Note: If I don't provide the -Credential param, both jobs work fine. The jobs only fail if the task is both weekly, and running as this domain user. I can't find information on why this is happening, nor think of any reason it would behave differently for weekly jobs. The "History£ tab in the Task Scheduler has almost no useful information, just "Task stopping due to user request" and "Task terminated", both of which have no useful info: Task Scheduler terminated "{eabba479-f8fc-4f0e-bf5e-053dfbfe9f62}" instance of the "\Microsoft\Windows\PowerShell\ScheduledJobs\Test1" task. Task Scheduler stopped instance "{eabba479-f8fc-4f0e-bf5e-053dfbfe9f62}" of task "\Microsoft\Windows\PowerShell\ScheduledJobs\Test1" as request by user "MyDomain\SomeUser" . What's up with this? Why do weekly tasks run differently, and how can I diganose this issue? This is PowerShell v3 on Windows Server 2008 R2. I've been unable to reproduce this locally, but I don't have a user set up in the same way as the one in our production domain (I'm working on this, but I wanted to post this ASAP in the hope someone knows what's happening!). Import-Module PSScheduledJob $Action = { "Executing job!" } $cred = Get-Credential "MyDomain\SomeUser" # Remove previous versions (to allow re-running this script) Get-ScheduledJob Test1 | Unregister-ScheduledJob Get-ScheduledJob Test2 | Unregister-ScheduledJob # Create two identical jobs, with different triggers Register-ScheduledJob "Test1" -ScriptBlock $Action -Credential $cred -Trigger (New-JobTrigger -Weekly -At 1:25am -DaysOfWeek Sunday) Register-ScheduledJob "Test2" -ScriptBlock $Action -Credential $cred -Trigger (New-JobTrigger -Daily -At 1:25am)

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• Can't view other computers on Network

  - by Darkart

  Systems: My Machine: Windows 7 Ultimate connected through ethernet into router Her Machine--Other Machine: Windows 7 Ultimate connected through wireless Router:F5D8236-4 N Wireless Router Version 1 Firmware: 2.01.03 (Apr 28 2009) ISP: Comcast Problem: I can not view the "Other Machine" on the network at all. I opened command prompt and ran net view and saw the pc name. I tried pinging the pc and it times out. Went inside the router and tried viewing the computer on the DHCP list and it can not be seen. I restored the router back to default settings and firmware and completely reset the modem and router, and created home group. I went to the other machine to configure home group settings and made sure that both PC's had identical settings. She was able to see my machine but I could not see hers. I restarted both machines and now we cant see each other at all. Also her PC ("Other Machine") had exclamation mark in the wireless icon but was connected just fine. There is no firewalls on currently or anti-virus enabled, and still can not see each other. Right now I am checking for updated drivers for the wireless card, but my question is could it be the router or something hardware related? I have went through all the settings in the Home group and visited most FAQ's and still no luck. Also as it stands I can not view her machine inside the router DHCP Client List :(

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• Issues resolving DNS entries for multi-homed servers

  - by I.T. Support

  This is difficult to explain, so bear with me. We have 2 domain controllers, each multi-homed to straddle 2 internal subnets, (subnet A and subnet B) and provide dns, dhcp, and ldap authentication. Both domain controllers each have 2 DNS entries. both entries have identical host names, but correspond to subnet A & subnet B respectively (example entries shown): dc1 host 192.168.8.1 dc1 host 192.168.9.1 dc2 host 192.168.8.2 dc2 host 192.168.9.2 We also have a 3rd subnet for our dmz, (subnet C) which neither domain controller has an IP address on, but our firewall/routing tables provide access to subnet A from subnet C and vice versa, but don't allow access to subnet B from subnet C. Here's my issue. How can I force/determine which dns entry is used when a server on subnet C queries either domain controller by host name? Right now it seems to randomly pick one of the two entries, swaps out the name for the IP address and that's that. The problem is if it randomly selects the entry that corresponds to the 9.x subnet B (no access from subnet C), then the server fails to resolve. If it picks the entry for the 8.x subnet A then it resolves (firewall/routing tables defined for communication between these 2 subnets) Here's what I'd like to know: What are Best Practices (if any) for dealing with DNS resolution on subnets that the DNS servers don't have a presence on? Can I control something akin to a metric value to force an order of DNS resolution when there are multiple entries for the same host name that correspond to different IP subnets? Should I even have 2 DNS HOST entries for the same name? Here's what I'd like to avoid: Making edits to the HOSTS files of servers on subnet C to force DNS resolution of the hostname to the appropriate subnet Adding NIC's to the DC's to have them straddle the DMZ as well, thus obtaining a third DNS entry that corresponds to subnet C Again, my apologies if this was too verbose / unclear. Thanks!

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• Occasional "Could not load file or assembly" in asmx WebService on IIS and DFS

  - by jesse-mcdowell

  We have a handfull of ASMX web service hosted on two identical Windows Server 2003 boxes. The virtual directory for the web services is loaded in a DFS share, both servers point to the same share. We have a load balancer between the internet and the two web servers. At a seemingly random interval (right now about twice per week) when a user tries to access a method on the web service, IIS returns the error: "Could not load file or assembly" for one of the assemblies used in the method call, and will continue reporting it each time the method is called until the app pool is recycled. We haven't found any distinguishable pattern to the problem. This is what I know: the missing assembly varies (but it's always a home-brew assembly) the Web Service method that fails varies there is no noticeable pattern to the times or intervals where the problem appears there are no admin users accessing the servers when the problem appears the failing method will work correctly on one server and fail on the other, even though both point to the same bin folder the problem can always be corrected by recycling the app pool and making no other changes I have enabled the Assembly Binder Log, and know that the binder is looking in the correct location for the file. Our assemblies are compiled for .Net 3.5.

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• How to make DD-WRT router's (configured like a repeater) devices be accessible on LAN? (i.e. integrate DHCP for both routers)

  - by Annonomus Penguin

  I have a D-Link DIR-600-A1 router running DD-WRT (using the 601's firmware: except for the model number, they are near identical). It has an Atheros chip, so there is no "repeater" option. You can bypass this by setting the main radio as a client to the main router, and adding a virtual radio configured as an AP. You can then set up the credentials for connecting to the main router and allowing devices to connect to the repeater/router. I have a few devices on my network: Ethernet computers Server with Samba running WiFi devices connected to the main router I then wanted to add a repeater. I have a couple of other things on the repeater: WiFi Computer Other WiFi devices. Anyway, I wanted to connect my WiFi computer to the share on my server via Samba. However, for some reason, my router treats the main router as WAN, not another device. I've tried disabling the SPI firewall: However, that doesn't work. I've tried pinging my WiFi computer from my server. However, I can ping my server from my WiFi computer. AFAIK, they are on the same subset, just using different IPs: the main one uses 192.168.0.x and the repeater uses 192.168.1.x (starting at 100 for some reason). It seems as I need to configure my router(s) to work together for DHCP. I noticed there was a "DHCP forwarder" option, but I have no idea what that would do. A quick note: for some reason (that's beyond me) my ISP disabled the capability to bridge a WiFi to ethernet connection with the router they provide (something about PPPoE or similar...). The service rep I talked to when I was having issues after I changed ISPs said that, but they couldn't explain exactly what they were "blocking." How can I get DD-WRT to not treat the client connection as WAN and the router to recognize the devices connected to the repeater?

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• Persistent static route stops working after VPN drops and reconnects

  - by user76157

  I've got a VPN between two networks, one home and one office (A and B). Their subnets are: (A) 192.168.1.0 and (B) 192.168.0.0 The two networks have identical ADSL routers. Unfortunately these can only do dial-out VPN. So I've got a Windows 2008 server on Network B acting as a VPN server (ServerB). Network A's router (RouterA) passes through Network B's router and connects via PPTP to ServerB. RouterA is assigned the static IP 192.168.0.40 on Network B. There's a persistent static route on ServerB telling it to use 0.40 for all requests to Network A's subnet, 192.168.1.0. (route -p add 192.168.1.0 mask 255.255.255.0 192.168.0.40). This enables ServerB to ping all machines on A (and those machines to ping ServerB). The VPN connection occasionally drops (I'm not sure why - it's set to remain always on and seems to drop randomly). This wouldn't be too much of a problem, as it reconnects automatically and quickly, except that when it does reconnect, the static route on ServerB no longer works. Route print (on ServerB) shows that the persistent static route still exists. However a tracert to a machine on Network A doesn't use the static route; it tries instead to use ServerB's default gateway (which is RouterB), and fails to find the machine. Deleting and re-adding the static route fixes the problem - a tracert uses the static route. At the moment, a batch file to delete and re-add the static route is scheduled to run every day. But this is clearly far from an ideal solution! I hope that's not too confusing. Any help would be very much appreciated.

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• How to add an SSH user to my Ubuntu 12 server to upload PHP files

  - by user229209

  I have an Ubuntu 12 VPS and wanted to create a user account to upload and download my PHP code. So when logged in as root I created a user "chris" and then created a directory /var/www/chris I want "chris" to be able to upload and run files to the /var/www/chris directory. Permissions for the chris dir look like this: drwxrwxr-x 2 root chris 4096 Aug 20 03:35 chris As root I created a sample file called abc.php and put it in the chris dir. It worked fine when I test it in a browser. I logged in as chris and uploaded a file called 1234.php. That did not work. I just got a blank PHP page. The code was identical in both files. So it is not the code. The permissions now look like this: -rw-r--r-- 1 root chris 59 Aug 20 03:34 1234.php -rw-r--r-- 1 root root 49 Aug 20 03:21 abc.php How do I alow the "chris" user to upload files and get them to work?

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• Network profile reverts to 'Unidentified' following Windows Update reboot

  - by user140575

  I have searched high and low for a solution to this problem. I have multiple servers running Windows 2000 Server as well as Windows Server 2003, 2003 R2, and 2008 R2. All of these servers are on the same Active Directory domain. The servers run showing the network profile as Domain Network, which is fine and correct. However, when a Windows update is installed, the server changes the profile to Unidentified Network once it has rebooted. This then doesn't allow any traffic to the server. For security reasons, we can't turn the firewalls off for. The only way to fix the problem is to physically be in front of the machine and work on it to change the profile back. Once the Profile has been reinstated to the Domain profile, it will be fine until the next month's update. This happens on all the Windows software mentioned above. The machines are not all identical, so it's not a hardware problem either. If anyone can help I'd be very grateful.

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• DRBD on a disk with existing file system that takes all the place

  - by Karolis T.

  I'm currently trying to simulate the environment via XEN. I have installed two debian systems with such FS layout: cltest1:/etc# df -h Filesystem Size Used Avail Use% Mounted on /dev/xvda2 6.0G 417M 5.2G 8% / tmpfs 257M 0 257M 0% /lib/init/rw udev 10M 16K 10M 1% /dev tmpfs 257M 4.0K 257M 1% /dev/shm Host cltest2 is identical. Here's my drbd.conf global { minor-count 1; } resource mysql { protocol C; syncer { rate 10M; # 10 Megabytes } on cltest1 { device /dev/drbd0; disk /dev/xvda2; address 192.168.1.186:7789; meta-disk internal; } on cltest2 { device /dev/drbd0; disk /dev/xvda2; address 192.168.1.187:7789; meta-disk internal; } } I have not created filesystem on drbd0 Starting DRBD via init.d script errors out with: Starting DRBD resources: [ d(mysql) /dev/drbd0: Failure: (114) Lower device is already claimed. This usually means it is mounted. [mysql] cmd /sbin/drbdsetup /dev/drbd0 disk /dev/xvda2 /dev/xvda2 internal --set-defaults --create-device failed - continuing! Running: drbdadm create-md mysql gives: cltest1:/etc# drbdadm create-md mysql md_offset 6442446848 al_offset 6442414080 bm_offset 6442217472 Found ext3 filesystem which uses 6291456 kB current configuration leaves usable 6291228 kB Device size would be truncated, which would corrupt data and result in 'access beyond end of device' errors. You need to either * use external meta data (recommended) * shrink that filesystem first * zero out the device (destroy the filesystem) Operation refused. Command 'drbdmeta /dev/drbd0 v08 /dev/xvda2 internal create-md' terminated with exit code 40 drbdadm aborting As I understand, all of my problems are because I don't have unallocated disk space on xvda2. What are my options besides shrinking FS and connecting a separate physical disk? Can't the meta-data be stored on a file in the local filesystem?

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• Apache Virtual host not recognized

  - by Bozho

  I've been using one server, then I reinstalled everything on another server, and the mod_jk stopped working. Here is the situation: apache 2.0 sitting "in front" mod_jk used to connect to the apache to tomcat tomcat 6.0.26 used to server the actual requests I followed this tutorial. The result is: accessing http://mysite.com opens the index.html in /var/www/ accessing http://mysite.com:8080/ works OK the logs at /var/logs/apache2 show everything is OK: [Mon Mar 29 22:01:53.310 2010] [28349:3075389184] [info] init_jk::mod_jk.c (2830): mod_jk/1.2.26 initialized [Mon Mar 29 22:01:53 2010] [warn] No JkShmFile defined in httpd.conf. Using default /var/log/apache2/jk-runtime-status [Mon Mar 29 22:01:53 2010] [notice] Apache/2.2.9 (Debian) mod_jk/1.2.26 configured -- resuming normal operations I compared the server.xml, jk.conf, sites-enabled/mysite from the new server to those from the old one and they are identical. The domain name is the same (I updated the DNS record today, and it has refreshed successfully) So the question is, what can go wrong? Is there another place where problems would be logged, if such occur? Update What I can be almost certain of is that the virtual host is not recognized. It is always forwarded to the default virtual host. So, how to make sure the virtual host is recognized and working?

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