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• My HP ProBook 4520s running Windows 7 hangs intermittently

  - by Rory Alsop

  I have not been able to trace a consistent cause, but a few times a day my laptop will hang for up to about a minute. I can still move the cursor which displays as the wait icon for whatever application I was last in, but cannot carry out any other actions. Unfortunately I can't Ctrl+Alt+Del to bring up a task manager and I just have to wait. I can't pin it down to a particular application either, but generally I have either office apps, a browser or other tools open. I'm tempted to think it may be network timeout on something, as I can't think of anything else which would delay for that long with such a significant impact, but as I'm more a Unix person I thought it would be worth asking here.

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• What is the "real" difference between a NAS and NFS? Or, why pick a NAS device over "mere" NFS?

  - by warren

  From an end-user perspective, what is the difference between a NAS device and using NFS exports from a file server? They seem to accomplish the same end result. The difference between a SAN and other file storage is related (in my experience) to how they are connected to the server infrastructure. However, the difference between a NAS, connecting over a standard ethernet port, and NFS (sharing storage off specific servers, also over the network), seems more nebulous. Is there a good reason to pick a NAS filer over just running NFS on servers?

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• Why does my CentOS logrotate run at random times?

  - by Mike Pennington

  I put a logrotate configuration file in /etc/logrotate.d/ and expected the logs to rotate at a consistent time; however, they do not... log rotation times are seemingly random +/- one hour. Why are the log rotation start times random, and how can I change this? Informational: my logrotate config file looks like this... /opt/backups/network/*.conf { copytruncate rotate 30 daily create 644 root root dateext maxage 30 missingok notifempty compress delaycompress postrotate ## Create symbolic links in daily/ PATH=`/usr/bin/dirname $1`; FILE=`/bin/basename $1`; /bin/ln -s $1 $PATH/daily/$FILE endscript }

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• Hitching and Slowness Due to HDD Activity on Ubuntu, But Not Windows?

  - by Espionage724

  It's been bothering me for months now, but I've noticed in Ubuntu (or any distro of Linux I've tried), any major I/O activity will cause hitching and general slowness. For example, if I try doing a file transfer from my network computer to the computer I'm using and try moving the mouse after a while, it might not respond for a second or so. Similar incidents occur in other cases too (right-clicking to get a context menu takes a few seconds, hitting the drop-down application bar takes a while, etc). My HDD isn't top-notch (a WD Blue 500GB 7200RPM drive) but I don't recall it being nearly this bad in Windows 7, 8, or 8.1. CPU activity during file transfers is relatively low (less than 10-20% on all cores of a Phenom II X4 @ 3.3Ghz). I'm using Gnome System Monitor (on Xubuntu) and can't seem to see what kind of HDD activity is occurring though. I have 8GB of RAM too, which is moderately being used (2.5GB), but shouldn't be a problem either. Any ideas what's up? I've tried kernels between 3.8 and 3.11 (i'm using saucy currently with 3.11).

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• Yum through http proxy

  - by eodchop

  I have several Fedora 13 servers that have to connect through an http proxy for yum updates. All port 80 traffic has to be routed through this proxy. I have setup the proxy server in the network settings GUI. I can browse the internet just fine. I have also setup my proxy information in /etc/yum.conf as follows: proxy=http:proxy.largecorp.corp/accelerated_pac_base.pac proxy_user=user proxy_password=password I then added the export HTTP_PROXY="http:proxy.largecorp.corp/accelerated_pac_base.pac" to /etc/bashrc and sourced the file. When i run yum update: Loaded plugins:presto, refresh-packagekit Error: Cannot retrieve repository metadata (repomd.xml) fro repository: fedora. Please verify its path and try again. All of the repo urls are the defaults, as this is a fresh install.

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• Video streaming and internet browsing on different bands/frequency

  - by user47207

  I have a Netgear WDNR37000 which allows clients on a 2ghz or 5ghz to access the internet and see every client and device on the network. I have a computer with two nics, one that is in the 2ghz range and the other on the 5ghz range. My specific problem is that I would like to serve my video streams (hulu, ps3mediaserver, playon) to my ps3 on the 5ghz band while internet browsing is routed to the 2ghz band. This is so that the video streams aren't affected by general internet use. While the easiest solution would be to disable internet access on the 5ghz apn, I would like to know of a solution that would not require that.

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• Routing DHCP traffic over the internet

  - by rmanna

  i'd like to know if it's possible for the internet to be between a DHCP server and the network it's "assigned" to? so basically, something like this: -------------- ------------- ------------- | DHCP Server | | DHCP | | Clients | | |-----Internet-----| Relay Agent |------| 192.168.0.* | | | | 192.168.0.1 | | | -------------- ------------- ------------- the behavior i'm seeing is that the DHCP server is offering 192.168.0.* IPs and sending them back to 192.168.0.1, which it can't reach. i tried masquerading the packets sent by the relay agent but that doesn't seem to work. from what i've been reading, this is normal behavior since the DHCP server uses the GIADDR as the destination address for its OFFERs, and not the actual source IP of the packets it receives from the relay agent. sooo, given that my DHCP server needs to be "on the other side of the internet" as depicted above, how can i get this working? are there settings for dhcpd to do this or is creating a VPN containing the DHCP server and the relay agent the only way? thanks!

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• Multiple iSCSI Targets or 1 that's shared?

  - by Joost Verdaasdonk

  On my network I have several types of files I want to save on a SAN like: SQL db's and logs Exchange data Random files Now I'm wondering if I should create one iSCSI Target with a large volume and initiate that from one of the servers. (and share it so other servers can use it too) Or I should create separate Targets to have each server use its own storage. For the record the storage could be separated because the servers aren't using the shared data. For one reason I was thinking of one storage is ease of backup. (but perhaps performance could be a problem?) What would be an advisable configuration for these type of data?

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• Active Directory Account Always Locked

  - by Joel

  My account in the domain at work comes up locked every morning and it's turning out to be unbearable. The domain admins have no clue as to what could be causing it and therefore I must call evey morning to have my account unlocked. I normally don't log off when leaving for the day, next morning I can unlock my computer and access my workstation but when I try to do anything domain-related I realize my account is locked. This is what I've tried so far: Deleted all network drives Made sure all the servers I remotely access neither have a session with my account or a service running under my account. No service is locally running with my account in my workstation. What else can I try?

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• VPN stuck on Verifying Username and Password

  - by user2791

  I'm building a new machine and everything is working correctly, except that I can't log on to my VPN. It hangs at the "Verifying username and password..." step, then returns after about 30 seconds claiming Error 721. I have another machine sitting next to this one with the VPN connection configured exactly the same, connecting just fine over the same wifi network, so I'm convinced that there is no server or firewall problem. The VPN works fine. This machine simply can't connect to it given the correct credentials and configuration. Any suggestions?

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• Cannot access Nagios Web Interface

  - by Dominiqs

  After successfully installing Nagios core 3.4.1 (i also installed plug-in1.4.11) on our linux rhel 5.3 server i cannot login to the nagios web interface.I am running apache 2.2.3 I am using internet explorer 8 and also firefox 3.6.3 When i try to enter the url http//localhost/nagios/ on a desktop (on the same network as the Nagios server)it does seem to like it but if i try http//x.x.x.x/nagios/ (where x.x.x.x is the IP address of my nagios server) it likes it but then the authentication popup appears after entering the password and username(nagiosadmin) it throws the errors below The server x.x.x.x at Nagios access requires a username and password Warning this server is requesting that your username and password be sent in an insecure manner(basic authentication without a secure connection) After a few attempts i get error 401 authentication required error from internet explorer ;this server could not verify that you are authorized to access the document requested. Either you supplied the wrong credentials or your browser doesnt understand how to supply the credentials required. Help Please anyone..seems like an authentication issue

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• Enterprise Level Monitoring Solution

  - by Garthmeister J.

  My company is currently looking to replace our current solution used for monitoring our web-based enterprise solutions for both up-time and performance. Please note this is not intended to be a network monitoring-type solution (internally we currently use Nagios). If anyone has a provider that they have had a positive experience with, it would be much appreciated. Here is a list of our requirements: • Must have a large number of probes/agents around the globe to be representative of our customer base • Must have a flexible scripting capability to automate multi-step user actions • 24 hour a day monitoring • Flexible alerting system • Report generation capability • Mimic browser specific monitoring (optional, not a must-have)

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• Hardware changes to require XP Activation ? (for a Virtual Machine)

  - by NVRAM

  I have WXP-64 running on a VM and, for testing and performance reasons, I would like to occasionally change the allocations for it. Changes might include: Number of CPU cores, Amount of RAM Add/remove network adapters. But I'm concerned that XP will demand re-activation and that I might eventually have licensing issues if I do this. So, can anyone tell me: What kind of changes trigger re-activation in XP? Is there limits or caveat with regard to re-activation? I've perused this question and the article it references, but wanted more recent and verified info. (FWIW, I'm not trying to cheat: the OS copy was purchased explicitly for the VM.)

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• Error page for OWA users on a different server?

  - by W_P

  We are getting ready to do a network-wide upgrade to Exchange 2010. The url for the old 2007 mailboxes is at https://mail.example.com and users who have had their mail box moved will have to go to https://Email.example.com If a user that has a 2010 mailbox attempts to login at the 2007 OWA location, they get a standard 403 Forbidden page. We would like to show them a page of our own making, that includes a link to the 2010 OWA login page. I assumed we could do this with an IIS Custom Error page, but setting the 403.4 error page in IIS on the Default web site doesn't seem to be working. Does anyone know how we could get around this? BTW, our OWA for the 2007 boxes in on Windows Server 2003, and IIS 6

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• Is this a good implementation of a loop in Prolog?

  - by Carles Araguz

  First of all, let me tell you that this happens to be the first time I ask something here, so if it's not the right place to do so, please forgive me. I'm developing a rather complex software that has a Prolog core implementing a FSM. Since I don't want it to stop (ever), I'm trying to write a good loop-like predicate that would work using Prolog's recursion. After a few unsuccessful tries (mainly because of stack problems) I ended up having something similar to this: /* Finite State Transition Network */ transition(st0,evnt0,st1). transition(st1,evnt1,st2). transition(st2,evnt2,st0). fsm_state(state(st0),system(Energy,ActivePayloads),[]) :- /* ... */ transition(st0,evnt0,NextState), !, fsm_state(state(NextState),system(Energy,ActivePayloads),[]). fsm_state(state(st1),system(Energy,ActivePayloads),[]) :- /* ... */ transition(st1,evnt1,NextState), !, fsm_state(state(NextState),system(Energy,ActivePayloads),[0,1,2]). fsm_state(state(st2),system(Energy,ActivePayloads),[P|Params]) :- /* ... */ transition(st2,evnt2,NextState), !, fsm_state(state(NextState),system(Energy,ActivePayloads),[]). start :- Sys = system(10,[]), fsm_state(state(s0),Sys,[]). Is this a good approach?

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• How to use proxy on Virtual Box (Windows XP)

  - by John

  I'm not exactly the most tech savy so please bear with me. I am trying to connect through a proxy with my Virtualbox accounts. Initially I wanted to just set the browsers in each virtualbox under a proxy but my boss said that it can probably be done right off the bat under the virtualbox accounts itself. Could anyone guide me on how to do this? All the instructions online state that their should be a proxy setting in preferences however all I see is a Network Adapter tab. Thanks!

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• netgear GS108TV2 RSTP configuration

  - by jhowland

  I have a large set of GS108TV2 units--my goal is to set up a network which is comprised of several loops for redundancy/fault tolerance. I have a minimal 3 switch loop configured, with RSTP enabled on two ports on each switch. I have my bridge max age set to 6, and my bridge forward delay set to 4, which are the minimum values allowed. Hello time is fixed at 2 seconds. The switches respond to a cable being removed from a socket, but it takes too long. I cannot get the switch to respond to a loss of connection on one of the redundant ports in less than 20 seconds. Is there any way to configure these switches to respond faster than 20 seconds? That is unacceptable for my application. thanks in advance for any help

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• Grub gives messages about the boot sector being used by other software. What should I do?

  - by Bobble

  This only happens with one of my computers. It is an elderly laptop that has had a long and varied history with several operating systems, but in its retirement it is acting as a server for my home network using Ubuntu 12.04. It is a single-boot system, there are no other systems installed. Every so often, whenever there is a grub upgrade, I notice a message like this: Setting up grub-common (1.99-21ubuntu3.4) ... Installing new version of config file /etc/grub.d/00_header ... Setting up grub2-common (1.99-21ubuntu3.4) ... Setting up grub-pc-bin (1.99-21ubuntu3.4) ... Setting up grub-pc (1.99-21ubuntu3.4) ... /usr/sbin/grub-setup: warn: Sector 32 is already in use by FlexNet; avoiding it. This software may cause boot or other problems in future. Please ask its authors not to store data in the boot track. Installation finished. No error reported. Should I be worried about this? What (if anything) should I do about it?

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• Can't get port forwarding to work on Ubuntu

  - by Znarkus

  I'm using my home server as NAT/router, which works well. But now I'm trying to forward port 3478, which I can't get to work. eth0 = public interface eth1 = private network $ cat /proc/sys/net/ipv4/conf/eth0/forwarding 1 $ cat /proc/sys/net/ipv4/conf/eth1/forwarding 1 Then to forward port 3478 to 10.0.0.7, I read somewhere that I should run iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 3478 -j DNAT --to-destination 10.0.0.7:3478 iptables -A FORWARD -p tcp -d 10.0.0.7 --dport 3478 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT I also ran ufw allow 3478 But testing port 3478 with http://www.canyouseeme.org/ doesn't work. Any idea what I have done wrong?

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• Wireless option grayed out in Windows Mobility Center

  - by thomasvdb

  We currently have a Lenovo ThinkPad L512 which can't connect to wireless networks. He simply indicates he can't find any networks. Other notebooks (also ThinkPad L512-notebooks) in the company do find the network so nothings wrong with the configuration of the wireless router. As indicated on answer.microsoft.com, I should check Windows Mobility Center and enable the entry "Turn Wireless On". Unfortunately this option has been grayed out. How can I enable this option? There isn't a physical switch on the laptop to turn on the wireless.

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• Use the &ldquo;using&rdquo; statement on objects that implement the IDisposable Interface

  - by mbcrump

  From MSDN : C#, through the .NET Framework common language runtime (CLR), automatically releases the memory used to store objects that are no longer required. The release of memory is non-deterministic; memory is released whenever the CLR decides to perform garbage collection. However, it is usually best to release limited resources such as file handles and network connections as quickly as possible. The using statement allows the programmer to specify when objects that use resources should release them. The object provided to the using statement must implement the IDisposable interface. This interface provides the Dispose method, which should release the object's resources. In my quest to write better, more efficient code I ran across the “using” statement. Microsoft recommends that we specify when to release objects. In other words, if you use the “using” statement this tells .NET to release the object specified in the using block once it is no longer needed.   So Using this block: private static string ReadConfig()         {             const string path = @"C:\SomeApp.config.xml";               using (StreamReader reader = File.OpenText(path))             {                 return reader.ReadToEnd();             }         }   The compiler converts this to: private static string ReadConfig1() {     StreamReader sr = new StreamReader(@"C:\SomeApp.config.xml");       try     {         return sr.ReadToEnd();     }     finally     {         if (sr != null)             ((IDisposable)sr).Dispose();     }   }

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• Internet sharing over LAN on Windows Server 2012

  - by USER

  I have a DSL modem connected to a server (ON NIC1) running Windows Server 2012 and 7 computers (running Windows 7 32-Bit) connected to a server though a network switch (ON NIC2). I shared the internet connection from the server through DHCP so I am able to access the internet from those 7 computers, but I am unable to: Access Google.com Activate Windows Update Windows An error is arising that says UNABLE TO ACTIVATE WINDOWS Activation Error Code: 0x80072EE2 Firewall and Anti-Virus are off on both the Server and the Clients. Is there is any additional setting that I want to do?

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• Remote Desktop connection breaks the wireless connection

  - by Michal Talaga

  When I connect to my Windows 8 Professional machine via Remote Desktop (RDP) I almost always get my WiFi connection broken. The setup: T61P Lenovo Laptop + W8 at home Wireless Router with NAT forwards connections to that machine Windows 7 laptop at work connecting to the home laptop When I connect, very often I get to login and suddenly connection is lost and I cannot reconnect again. When I get home I find my WiFi connection is still connected to the Access Point but does not function. Can't even ping the router. What is strange is that disabling wireless with the hardware switch and enabling it again doesn't help. The only way to make it works again: - Reboot - Disable wifi with hardware switch AND disable the network card in Device Manager, then enable both I did not have this problem on the very same laptop when it was running Windows 7. Any hint how can I find where the problem is?

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• Build Advise for Home Web/NAS Server with Ubuntu Server 12.04 [closed]

  - by razor7

  I need to have a personal Webserver with NAS capabilities. The Webserver to test some LAMP projects I develop for clients, and also NAS to be able to stream media to local network. I want to have full control of the box, so I'm planning to build it with some spare parts and Ubuntu Server. The services/software that will run are (remember, is for personal and testing use only): SAMBA/CIFS SSH Server Apache 2 MySQL 5 Mercurial Repo PHP 5.3 Ruby on Rails OwnCloud Dovecot Webmin Postfix PureFTPd ClamAV The Hardware: Intel Dual Core E2180 2.0 GHz MSI P35 Neo Kinkston 1GB DDR2, 667 MSI Nvidia 7300le PCIe x16 256mb RAM HDD SATA WD Green 2TB x2 (RAID-1 with MDADM RAID Controller) 16 GB USB Pendrive (For server system installation) My idea is to build this system, using the pendrive for the Ubuntu Server software, and packages, and the RAID-1 for gross data storage. What do you think? Thanks a lot!

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• Securing internal data accessed by a website on the big, bad internet

  - by aehiilrs

  A close relative of this question on Stack Overflow: When you have a web site in your DMZ that needs to access production data stored on an internal DB, what strategies do you recommend using to lower the risks that come from accessing live data? Is it even considered acceptable to have a connection initiated from the DMZ come inside of your network? An extra detail about the nature of the site that kind of throws a monkey wrench into the machinery is that people using the web site will be competing for "spots" on a first-come, first-serve basis with others using the internal software. Because of this, as close to zero lag time between the two applications as possible is ideal.

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