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• Disable the user of Internet explorer through policies when called from HTML help

  - by Stephane

  Hello, I have a locked down environment where users are prohibited from doing, well, basically anything but run the specific programs we specify. We just switched a program from using the venerable "WinHELP" help format to HTML help (CHM) but that seem to have an unwanted and rather dangerous side effect: when a user click on a hyperlink inside the HTML help, a new internet explorer window is opened and the user is free to browse and do terrible things to my server (well, not that much, but still...) I have checked the session in this case and the IE window is actually hosted within the help engine: there is no iexplore.exe process running in the user session (and it cannot: it's explicitly prohibited). We have disable all help right now until we find a solution. I'm working with the help team to have all external URLs removed from the help file but that is going to be a long and error-prone task. Meanwhile, I've checked all the group policies option but I have to say that I was unable to find anything that would prevent a standalone IE window hosted in a random process from running. I don't want to disable WinHTTP or the IE rendering engine or anything of the sort. But I need to prevent all users members of a specific AD user group from ever having an IE window displayed to them. The servers are running Windows 2003 and Citrix metaframe 4.5. Thanks in advance

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• Routing RFC1918 addresses through dd-wrt via a switch

  - by espenfjo

  I am a bit stuck with an experiment of mine. I have a network looking somewhat like this. | Internet | | ---- |Switch| ---- | | Server w/pub IP | DD-WRT router 192.168.1.1 | | RFC1918 clients 192.168.1.0/24 What I want is for the RFC1918 clients to speak directly with each others. On the server with the public IP I have this route: 192.168.1.0/24 dev eth0 scope link and can see that packets are infact reaching the dd-wrt router for 192.168.1.1, even though if I get no answer. Trying to reach one of the RFC1918 clients from the public IP server will get no result, as the dd-wrt router is not announcing that network on to its external interface (arp who-has 192.168.1.107 tell xxx.xxx.xxx.xxx, but no answer). The router being an WLAN dd-wrt router has of course a load of routes, VLANs and interfaces: xxx.xxx.xxx.1 dev vlan2 scope link 192.168.1.0/24 dev br0 proto kernel scope link src 192.168.1.1 192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.244 84.215.64.0/18 dev vlan2 proto kernel scope link src xxx.xxx.xxx.xxx 169.254.0.0/16 dev br0 proto kernel scope link src 169.254.255.1 127.0.0.0/8 dev lo scope link 0.0.0.0 via xxx.xxx.xxx.1 dev vlan2 xxx.xxx.xxx.xxx being the public IP, and xxx.xxx.xxx.1 being the default route for the public IP. I am not sure where to continue with this. I would recon that I both need routing on the dd-wrt router, as well as some iptables magic? Why do something this complex? Why not ;) Also, do not mind that "Internet" can get RFC1918 traffic, it wont go outside of the walls. EDIT 1: Following the tip from stew I do indeed get the correct ARP flowing. And adding an iptables rule for allowing traffic from that specific public IPd machine I get traffic between the systems! Oddly enough though, the speed I get from Server w/pub IP - RFC1918 clients are the same as if the traffic were routed out onto the Internet and back. Edit 2: Ok, disconnecting the external Internet connection will still give the same, crappy transfer speed. So it has to be something else. Edit 3: Ok, I guess there are other reasons for this crappy speed. Case closed. :)

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• Configure IIS Web Site for alternate Port and receive Access Permission error

  - by Andrew J. Brehm

  When I configure IIS to run a Web site on Port 1414, I get the following error: --------------------------- Internet Information Services (IIS) Manager --------------------------- The process cannot access the file because it is being used by another process. (Exception from HRESULT: 0x80070020) However, as according to netstat the port is not in use. Completely aside from IIS, I wrote a test program (just to open the port and test it): TcpListener tcpListener; tcpListener = new TcpListener(IPAddress.Any, port); try { tcpListener.Start(); Console.WriteLine("Press \"q\" key to quit."); ConsoleKeyInfo key; do { key = Console.ReadKey(); } while (key.KeyChar != 'q'); } catch (Exception ex) { Console.WriteLine(ex.Message); } tcpListener.Stop(); The result was an exception and the following ex.Message: An attempt was made to access a socket in a way forbidden by its access permissions The port was available but its "access permissions" are not allowing me access. This remains after several restarts. The port is not reserved or in use as far as I know and while IIS says it is in use, netstat and my test program say it is not and my test program receives the error that I am not allowed to access the port. The test program ran elevated. The IIS Site is running MQSeries, but the MQ listener also cannot start on port 1414 because of this issue. A quick search of my registry found nothing interesting for port 1414. What are socket access permissions and how can I correct mine to allow access?

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• Configure a SPF rule on Ubuntu

  - by TiuTalk

  Where I can create/insert the SPF rules to allow a external server to authenticate and send e-mails using the domain name of my server running Ubuntu? I need to insert this rule: v=spf1 ip4:111.111.111.111/29 ip4:111.111.111.111/24 a mx ~all Thanks :)

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• Is Hacom Mars II Dual Blade good ?

  - by Joachim H. Skeie

  I am considering getting a Hacom Mars II Dual Blade for use as a firewall in a data-center for one of my colocated solutions. As the 1U enclosure have two identical firewalls, I am intending to use one of the firewalls as the external firewall using packet-filtering and load balancer (balancing load for my front-end nodes), while using the second as the internal firewall (as an application gateway). But I have no experience with Hacom, or pfSense firewalls. They do look really good on paper, but how are they in practice ?

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• How should I set up my Hyper-V server and network topology?

  - by Daniel Waechter

  This is my first time setting up either Hyper-V or Windows 2008, so please bear with me. I am setting up a pretty decent server running Windows Server 2008 R2 to be a remote (colocated) Hyper-V host. It will be hosting Linux and Windows VMs, initially for developers to use but eventually also to do some web hosting and other tasks. Currently I have two VMs, one Windows and one Ubuntu Linux, running pretty well, and I plan to clone them for future use. Right now I'm considering the best ways to configure developer and administrator access to the server once it is moved into the colocation facility, and I'm seeking advice on that. My thought is to set up a VPN for access to certain features of the VMs on the server, but I have a few different options for going about this: Connect the server to an existing hardware firewall (an old-ish Netscreen 5-GT) that can create a VPN and map external IPs to the VMs, which will have their own IPs exposed through the virtual interface. One problem with this choice is that I'm the only one trained on the Netscreen, and its interface is a bit baroque, so others may have difficulty maintaining it. Advantage is that I already know how to do it, and I know it will do what I need. Connect the server directly to the network and configure the Windows 2008 firewall to restrict access to the VMs and set up a VPN. I haven't done this before, so it will have a learning curve, but I'm willing to learn if this option is better long-term than the Netscreen. Another advantage is that I won't have to train anyone on the Netscreen interface. Still, I'm not certain if the capabilities of the Windows software firewall as far as creating VPNs, setting up rules for external access to certain ports on the IPs of Hyper-V servers, etc. Will it be sufficient for my needs and easy enough to set up / maintain? Anything else? What are the limitations of my approaches? What are the best practices / what has worked well for you? Remember that I need to set up developer access as well as consumer access to some services. Is a VPN even the right choice?

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• Intermittent NFS lockups on Isilon cluster

  - by blackbox222

  We have an Isilon cluster with 8 IQ 12000x nodes which exports storage via several NFS shares for a handful of Linux and Solaris clients. There is a Linux system that has one of these NFS filesystems mounted. I/O to this filesystem is moderately heavy from the Linux system. Every 3-4 weeks (it's not on any kind of discernible schedule, and sometimes is more/less frequent than this), we notice that all activity ceases on this NFS mount (the process hangs, as if the network stopped working so process is stuck in uninterruptible sleep) - 30 minutes later, the share recovers and things continue to work normally. The kernel log from the affected machine is as follows: Dec 3 10:07:29 redacted kernel: [8710020.871993] nfs: server nfs-redacted not responding, still trying Dec 3 10:37:17 redacted kernel: [8711805.966130] nfs: server nfs-redacted OK relevant /etc/fstab line: nfs-redacted:/ifs/nfs/export_data/shared/...redacted... /data nfs defaults 0 0 I've checked to see if there are any scheduled processes e.g. cron jobs, Isilon related functions e.g. snapshots, etc that might be causing these hangups but I can't seem to find anything. I'm also not aware of any network related issues or maintenance that would cause this. All of the lockups last almost exactly 30 minutes per the kernel logs. Perhaps someone has some suggestions I could try? (I considered a soft mount to avoid the problems associated with processes accessing the filesystem hanging; however am wary of the corruption that could result and it would not really solve the underlying issue anyway).

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• windows misconfigured keyboard after installing usb keyboard

  - by goliatone

  have a dell vostro 1520, installed an external usb keyboard which works fine but the laptop's keyboard does not work properly. in the log in screen everything works as it should, once logged in the keyboard breaks. keys that have an alternate symbol accessible with the FN key render it by default. Meaning i have to press the FN key for it to render the proper ones- p has the * as FN, in order to get the p i have to press p+FN.

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• computer build for extreme tabbed browsing

  - by David Berger

  I'm interested in building or buying a task-specific computer for my brother. His requirements are ridiculously simple: the machine has to be able to wait in hundreds of web-based virtual waiting rooms at once and not crash. To be competitive, he needs to be able to enter the waiting rooms an dauto-refresh them faster. My question is, what priority do I give the different specs? My initial surmise is this: Connection speed (nothing to do with my build, but I kind of think this will be more beneficial than anything I build for him) Memory size -- I don't usually see firefox taking up more than a gig, even when heavily tabbed, but I think one gig for the operating system and two gigs for the browser are necessary. Processor speed -- I think the processor will affect performance, but even something out of date will do what he needs Memory speed/RAM bus -- I doubt this will matter much, but it seems just on this side of irrelevant. Everything else is a non-issue for him. Does this seem to stack up correctly? Also, since he's looking to stay on the cheaper side, and I might end up recommending a refurb to him, is there anything particularly egregious that Vista would do if it came pre-installed? If I build it myself, I'll give him linux, but if I have it shipped to him, I'm not sure I could walk him through the install process for linux, but I probably could walk him through the process to upgrade to Windows 7, if it were somehow worth it.

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• Browser says "Waiting for www.xyz.com" for a very long time

  - by Phil

  When I load my website (hosted with Ipage). The browser often takes an incredible long time saying "Waiting for www.xyz.com ..." before any elements of the site actually appear. After this "Waiting for" process, the text, images and everything else actually load quite fast. I contacted my host with my tracert result and they said they optimized my website database and increased the memory available to PHP on my account to 64 Mb.They also said they have checked the issue by accessing my website and found that it is loading fine without any slowness. It seems to be a temporary issue. Please try to access your website with different browser and network. I tried different browsers and networks but this "Waiting for" process always takes too long. My website is http://www.surreyextra.com/ . It's Wordpress and BuddyPress. I'm in the UK while Ipage host is placed in the USA, can this potentially be a problem? I have tried a number of optimizations, like minifying my CSS and JS files and use catching but the problem hasn't improved. So is it my host's fault, should I contact them again?

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• Microsoft VirtualPC Networking Issue

  - by Joda Maki

  I am using Microsoft VPC running the supplied microsoft images to test IE6/7. The ip addresses that get assigned to these images are via dhcp and get valid ip addresses in my subnet. They can access the external internet just fine. However, they cannot ping my host machine, nor can my host machine ping them (using internal ip addresses). Thus, they can't access my webserver to test with. How is this possible and how do I fix it?

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• Website and Web Services Monitoring

  - by JohnyD

  I'm looking for a good product (either stand-alone or remote) that will monitor our online services. We're in a transition period between new asp.net and old foxpro / cgi and because of this experience errors that can make our services unresponsive. Can anyone suggest internal/external tools, subscription based solutions, or anything else that I can put in place to monitor all aspects of our web services? Thank you

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• How to mount a HFS partition in Ubuntu as Read/Write?

  - by GiH

  I plugged in my external harddrive (which was formatted on my Mac into HFS+ journaled) to my Ubuntu desktop 9.04 64bit. I am not able to get the drive to mount with write capability, how do I do that? Right now all I'm getting is read access, I tried sudo mount -t hfsplus /dev/sdf2 /media/"Portable HD" but that still gave me only read access... ideas??

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• Exchange 2010 outlook anywhere - shows internal URL

  - by Frederik Nielsen

  I am setting up an Exchange 2010 SP2 for a customer. However, the server address that the server returns with autodiscover is wrong, as it points to the internal domain (.local) - and not the external address. How do I change this? Here's an image to describe what I mean: It is the upper field that is wrong. I dont want users to enable the RPC over HTTP-thing, as the users know barely nothing about computers. Thank you in advance.

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• PHP FastCGI mode starting fails. Where do I look to diagnose why?

  - by Ben Dauphinee

  I'm working towards getting NGINX working with PHP5 in fastcgi mode. I've grabbed a config from the net and followed the instructions, and tried starting the service, which throws the message below. root@zedfastdev:/var/www/nginx-default# /etc/init.d/php-fastcgi restart * Restarting php-cgi in external FASTCGI mode php-fastcgi [fail]

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• Boot Toshiba Portege M200 with no CD drive

  - by BoundforPNG

  This has not CD drive and I would like to boot to Acronis to reload from an image that I created. I don't know how else to get the OS and all the drivers loaded. It doesn't seem to have Toshiba hidden boot partion on the HD. It doesn't seem to recognize my USB external CD drive or my USB flash drive. Any ideas? Paul

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• Exchange 2010 email spoofing prevention

  - by holian

  Masters, Unfortunately we got some spam mail which seems to be coming from our own domain. I found some article which all says to remove Anonymous login from internet receive connector (http://exchangepedia.com/2008/09/how-to-prevent-annoying-spam-from-your-own-domain.html) I think i something misunderstood about those articles, because if i remove the Anonymous connection e-mails did not receive from external address (like gmail - Diagnostic-Code: SMTP; 530 5.7.1 Client was not authenticated) Some pictures about our configuration:

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• SQL 2008 SP1 crashing almost daily

  - by matijake

  Hey, almost every day our new DB crashes. It is virtual server residing on same hardware as 5 other servers, two of them beeing identical MS SQL2008sp1 and two Oracle 11g's so I can pretty much rule out hardware issues. Server has dedicated local LUN, 4vCPU and 8GB memory with 2GB windows swap file. It runs 4 instances. Primary instance is limited to 5GB memory and paralelism set to 4 running on MS SQL 2008 SP1 @ Windows Server 2008 Enterprise R2 x64. Only that primary instance is crashing. After it crashes nothing can connect to it, it's even impossible to shut it down through service manager. What I found in logs is: ***Stack Dump being sent to C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\LOG\SQLDump0081.txt SqlDumpExceptionHandler: Process 4788 generated fatal exception c0000005 EXCEPTION_ACCESS_VIOLATION. SQL Server i s terminating this process.     Whole log can be seen at: http://kabl.org/files/SQLDump0081.txt second crash log made second later at: http://kabl.org/files/SQLDump0082.txt I have analyzed mini crashdump with Microsoft tools, but no promising results. If it can help, here it is: http://kabl.org/files/SQLDump0081.mdmp Any ideas are greatly welcome, since it is becoming quite a pain in the ass to restart server almost every day :) Regrads, -Matija

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• Wastage of resources in Virtualization

  - by Sabeen Malik

  I have asked this question on SO, but was suggested that i ask it here on SF, so here it goes. http://stackoverflow.com/questions/3010753/wastage-of-resources-in-virtualization I am not sure if this is the right place to ask the question. However i hope it is. When looking for a VPS earlier today, I was trying to understand how each container would work in the background. Keeping in mind the fact that the operating system uses most of the memory and power on a system, wouldn't having multiple operating systems in the same machine mean more wastage of resources. For instance if i was running centOS on a dedicated box and it was running lets say 20 background OS level processes. Then i go and install a virtualization platform and install 5 more centOS virtual machines in the same system which are exactly the same as the host operating system. Doesn't this mean duplication of those 20 processes 6 times? So internally the context switching is happening between 120 processes instead of 20? Further Notes: Here is an example of what i am thinking: I have a master-slave configuration for a long running, cpu + memory intensive process, which can be distributed to 4 machines. Lets say when the process runs on these 4 machines with lets say 1 Gh CPU and 1 Gig RAM, i get 400 results per hour from the cluster (assuming 100 results from one machine) . Now i get a bigger machine ( lets say 4Gh and 4 Gig RAM), have 4 virtual hosts on it with 1 Gz CPU and 1 Gig RAM. Will this configuration give me the same 4 results per hour from these 4 virtual hosts?

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• Webserver max CPU when apache and MYSQL are ran together

  - by Tim

  This website has been running fine without issues, Recently it went down. After some investigation it looks like the combo of MYSQL and Apache bring the box to its knees. Apache can run find serving static web pages and MYSQL can run fine when the website isn't working. As soon as the website is enabled with SQL running the CPU on the box remains at 100%. Picture of the usage: http://i.stack.imgur.com/GG2NC.png I've checked the sql database for errors, tried tuning nearly every parameter in apache/sql's conf file for performance. The server is a redhat based box running the latest software packages. Any help/suggestions are welcome. Doing an strace on a high cpu apache process I see the following: read(14, "", 8192) = 0 close(14) = 0 socket(PF_FILE, SOCK_STREAM, 0) = 14 fcntl64(14, F_SETFL, O_RDONLY) = 0 fcntl64(14, F_GETFL) = 0x2 (flags O_RDWR) connect(14, {sa_family=AF_FILE, path="/var/lib/mysql/mysql.sock"...}, 110) = 0 setsockopt(14, SOL_SOCKET, SO_RCVTIMEO, "\2003\341\1\0\0\0\0", 8) = 0 setsockopt(14, SOL_SOCKET, SO_SNDTIMEO, "\2003\341\1\0\0\0\0", 8) = 0 setsockopt(14, SOL_IP, IP_TOS, [8], 4) = -1 EOPNOTSUPP (Operation not supported) setsockopt(14, SOL_SOCKET, SO_KEEPALIVE, [1], 4) = 0 Here is what I see from a mysql process: futex(0x86fc9a4, FUTEX_WAIT_PRIVATE, 39, NULL) = 0 futex(0x86fc734, FUTEX_WAIT_PRIVATE, 2, NULL) = 0 futex(0x86fc734, FUTEX_WAKE_PRIVATE, 1) = 0 gettimeofday({1301465020, 141613}, NULL) = 0 clock_gettime(CLOCK_REALTIME, {1301465020, 141699633}) = 0 futex(0x8707a64, FUTEX_WAIT_PRIVATE, 1, {4, 999913367}) = 0 futex(0x8707a40, FUTEX_WAIT_PRIVATE, 2, NULL) = 0 futex(0x8707a40, FUTEX_WAKE_PRIVATE, 1) = 0 exit_group(0) = ?

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• Cannot assign a letter to a FAT32 partition

  - by Toc

  I have an external hard disk where I have created many partitions to use also in Linux. First two partitions are FAT32. The third is a Truecrypt partition. I cannot assign a letter to the second partition. When I go to Manage disk and right-click on the unassigned partition, most of the options are not enabled. What have I to do to see this partition on my XP PC?

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• Apple: Airport extreme, 3 questions

  - by Patrick

  1) Can I use airport extreme + external hard disk as a server ? I mean, can I run operating systems such as ubuntu on it ? 2) Is it a bit noisy ? Can I place it in my sleeping room ? 3) Can airport extreme expand networks ? On the Apple website they say only Time Capsule can do it: www.apple.com/wifi/ thanks

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• How can I enable pid and ppid fields in psacct dump-acct?

  - by annavt

  I am currently using the psacct package on Centos to perform accounting on processes run by users. The info file1 suggests that it is possible to output pid and ppid depending on what information your operating system provides in it's struct acct. pid and ppid are listed in /usr/include/linux/acct.h on my system: struct acct_v3 { char ac_flag; /* Flags */ char ac_version; /* Always set to ACCT_VERSION */ __u16 ac_tty; /* Control Terminal */ __u32 ac_exitcode; /* Exitcode */ __u32 ac_uid; /* Real User ID */ __u32 ac_gid; /* Real Group ID */ __u32 ac_pid; /* Process ID */ __u32 ac_ppid; /* Parent Process ID */ ... But pid and ppid are not output when I run dump-acct: # dump-acct /var/account/pacct.1 | tail awk | 0.0| 0.0| 81.0| 0| 0|8792.0|Thu Nov 24 04:03:04 2011 tmpwatch | 0.0| 0.0| 1.0| 0| 0|3816.0|Thu Nov 24 04:03:04 2011 cups | 0.0| 0.0| 4.0| 0| 0|8728.0|Thu Nov 24 04:03:04 2011 awk | 0.0| 0.0| 4.0| 0| 0|8792.0|Thu Nov 24 04:03:04 2011 runlevel | 0.0| 0.0| 0.0| 0| 0|3804.0|Thu Nov 24 04:03:04 2011 chkconfig | 0.0| 0.0| 0.0| 0| 0|3840.0|Thu Nov 24 04:03:04 2011 inn-cron-expire | 0.0| 0.0| 0.0| 0| 0|8728.0|Thu Nov 24 04:03:04 2011 awk | 0.0| 0.0| 0.0| 0| 0|8792.0|Thu Nov 24 04:03:04 2011 gzip | 5.0| 0.0| 9.0| 0| 0|4044.0|Thu Nov 24 04:03:04 2011 accton | 0.0| 0.0| 1.0| 0| 0| 0.0|Thu Nov 24 04:03:04 2011 Is it likely that there is no support in my kernel for this feature or that my psacct version does not support this? How can I add pid and ppid to my accounting logs? CentOS release 5.6 Kernel 2.6.18-238.19.1.el5 psacct 6.3.2 Thanks in advance Anna

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• Why do I get sparks from my usb connector when connecting it to my Mac

  - by david.sykes

  I have an external hard drive with its own power. When I touch the usb cable against the case of my Mac I get little sparks. I have tried it on a PC but don't seem to get the same sparks Why might this be?

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• Creating a pseudoterminal to make sudo happy

  - by larsks

  I need to automate the provisioning of a cloud instance (running Fedora 17) for which the following initial facts are true: I have ssh-key based access to a remote user (cloud) That user has password-free root access via sudo. Manual configuration is as simple as logging in and running sudo su - and having at it, but I would like to fully automate this process. The trick is that the system defaults to having the requiretty option enabled for sudo, which means that an attempt to do something like this: ssh remotehost sudo yum -y install puppet Will fail: sudo: sorry, you must have a tty to run sudo I am working around this right now by first pushing over a small Python script that will run a command on a pseudoterminal: import os import sys import errno import subprocess pid, master_fd = os.forkpty() if pid == 0: # child process: now that we're attached to a # pty, run the given command. os.execvp(sys.argv[1], sys.argv[1:]) else: while True: try: data = os.read(master_fd, 1024) except OSError, detail: if detail.errno == errno.EIO: break if not data: break sys.stdout.write(data) os.wait() Assuming that this is named pty, I can then run: ssh remotehost ./pty sudo yum -y install puppet This works fine, but I'm wondering if there are solutions already available that I haven't considered. I would normally think about expect, but it's not installed by default on this system. screen can do this in a pinch, but the best I came up with was: screen -dmS sudo somecommand ...which does work but eats the output. Are there any other tools available that will allocate a pseudoterminal for me that are going to be generally available?

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