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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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• iptables block everything except http

  - by arminb

  I'm trying to configure my iptables to block any network traffic except HTTP: iptables -P INPUT DROP #set policy of INPUT to DROP iptables -P OUTPUT DROP #set policy of OUTPUT to DROP iptables -A INPUT -p tcp --sport 80 -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A OUTPUT -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT The iptables output (iptables -L -v) gives me: Chain INPUT (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 4 745 ACCEPT tcp -- any any anywhere anywhere tcp spt:http state RELATED,ESTABLISHED Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 2 330 ACCEPT tcp -- any any anywhere anywhere tcp dpt:http state NEW,ESTABLISHED When I try to wget 127.0.0.1 (yes i do have a web server and it works fine) i get: --2012-11-14 16:29:01-- http://127.0.0.1/ Connecting to 127.0.0.1:80... The request never finishes. What am I doing wrong? I'm setting iptables to DROP everything by default and add a rule to ACCEPT HTTP.

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• When should .local be used?

  - by hydroparadise

  So, I've set up a few Win Servs in my time and always did the .local thing when there was a router that sepearated my internal from external networks. Now that I'm setting up an *nix box for the first time, does this concept still apply? Do I still want my FQDNs (/etc/hostname) to show .local or .com for all my machines (mixed: linux servers, win workstations) inside of my network. This question comes in context of always having Active Directory hold my hand every step of the way, where now I'm setting up an DNS machine manually.

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• ZFS on top of iSCSI

  - by Solipsism

  I'm planning on building out a file server using ZFS and BSD, and I was hoping to make it more expandable by attaching drives stored in other machines in the same rack via iSCSI (e.g., one machine is running ZFS, and others have iSCSI targets available to be connected to by the ZFS box and added to zpools). Looking for other people who have tried this has pretty much lead me to resources about exposing iSCSI shares on top of ZFS, but nothing about the reverse. Primarily I have the following questions: Is iSCSI over gigabit ethernet fast enough for this purpose, or would I have to switch to 10GbE to get decent performance? What would happen when one of the machines running iSCSI targets disconnects from the network? Is there a better way to do this that I just am not clever enough to have realized? Thanks for any help.

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• How to connect to internet 2 or more pcs with an usb wifi adapter

  - by bhaoahd

  In one pc I have an USB Wifi adapter (Realtek RTL8187L Chipset), from there a 10 meters cable to an outdoor antenna. With that I connect to a public Access Point. Now I want to be able to connect more computers to internet using that same connection that comes from the outdoor antenna, what options do I have to do this? I do have another usb wifi adapter with a small omni antenna, and a router encore ENHWI-G/A. This router can be used as a Wifi AP, but it needs a modem that works with the RJ45 connector. Is there a way I could take internet from the outdoor antenna, and create another AP indoor using that router to "repeat" that wifi that comes from the outdoor antenna? If creating this second AP is not possible, should I use some sort of local network between computers, connect my main PC with the outdoor antenna, and share the connection through the lan? (I would really prefer to have a second AP indoor so I can connect other devices like a Palm, but I am not sure how could this be possible with this router and the usb wifi adapter)

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• Hide unauthorized folders from view in webdav

  - by eric.s

  We have a Windows server running webdav. When a Mac connects to it they see the folders they do not have access to as a blacked out folder, and then the folders they do have access to as folders. This does not happen when a client using Linux or Windows connects. All users connect with their domain account credentials. I may not be searching properly to get the information I am looking for, so I turn here. Is this an issue that I should be researching on the Mac side, or ask our network team to be looking into settings on the server?

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• How to make NFS mounts available while offline?

  - by lpanebr

  Problem: I work on a notebook and while at work I have access to many NFS mounted drives. When I get home they are obviously not available. Windows 7 solution: My business partner uses Windows 7 and maps the folders via samba. Windows 7 has a very nice feature that let's he make these folders available offline. So when when he connects to the work network the changes get synchronized! Question: Is there a way to mimic that in ubuntu? What I have now: Server to local sync: I have added rsync entries on my crontab to copy server folders => local folders every five minutes. When at work I used the NFS mapped folders and while outside work I use the local copies. When I get at work I manually run a script that syncs local folders => server folders. Problems with my setup: slow startup when not at work (I guess do to the fstab trying to map the server folders) no conflict checking/managing I have to remember to sync manually and be careful because of the different file locations recent files do not work between work and home

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• Hostname confusion (Ubuntu Server 10.04)

  - by letseatfood

  I have just setup Ubuntu 10.04 Server Edition. I have been following this tutorial. The DNS information seems to be setup correctly now, but I am confused about the hostname. Currently it is laughingbuddha.home. That is a name I created. Now, I am mainly not sure how to connect from another computer on my network. I basically want to be able to put PHP files on the server box and then test them via a web browser on my other computer. So, I think I digressed from my first question, but would somebody please help me figure out if the hostname is okay for doing what I need to do? Thank-you!

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• Terminal Server 2003 Login Issue - Insufficient system resources exist to complete the requested ser

  - by LP

  Afternoon. We have three identical terminal servers running Windows Server 2003 SP2, on these servers there are about 250 concurrent users logged on. We're running Roaming Profiles on a central server running Active Directory which cache the profiles locally on each terminal server as well. When one, and just that one, user tries to login she gets this error message (roughly translated from Swedish): "You could not be logged in becouse your principle could not be registered. Check that you're connected to the network or ask your administrator Insufficient system resources exist to complete the requested service." Anyone have an idea about this? I'm stumped ... Best Regards LP

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• Top causes of slow ssh logins

  - by Peter Lyons

  I'd love for one of you smart and helpful folks to post a list of common causes of delays during an ssh login. Specifically, there are 2 spots where I see a range from instantaneous to multi-second delays. Between issuing the ssh command and getting a login prompt and between entering the passphrase and having the shell load Now, specifically I'm looking at ssh details only here. Obviously network latency, speed of the hardware and OSes involved, complex login scripts, etc can cause delays. For context I ssh to a vast multitude of linux distributions and some Solaris hosts using mostly Ubuntu, CentOS, and MacOS X as my client systems. Almost all of the time, the ssh server configuration is unchanged from the OS's default settings. What ssh server configurations should I be interested in? Are there OS/kernel parameters that can be tuned? Login shell tricks? Etc?

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• Vim: How can I :cd to an sftp directory?

  - by ChrisInCambo

  Hi, I'm currently an emacs user, but thought I would come back and take another look at Vim for fun. My client machine is Ubuntu, and I frequently work on other ubuntu servers within my network, emacs and tramp is really nice in this regard, I can just connect to a file via sftp and then easily navigate to it's parents/children/sibling, just as if I was dealing with a file on the local file system. With Vim I can sftp to a file, but none of the navigation stuff works, when I use :e or fuzzy file search, vim still thinks I'm back on the client machine. If I try to :cd to the sftp directory I get an error. Is there anyway I can get the same file/folder navigation regardless of whether I'm looking at an sftp folder or a folder on my client machine? Cheers, Chrsi

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• How to access Ubuntu Server from local PC?

  - by Roland

  Today I installed my first web server, which is Ubuntu 12.04 LTS. I got Apache, PHP and MySql working, there is even MyPHPAdmin! Everything is working fine on that PC, but the problem is that I have no idea how to connect to this server from my PC. Just to clarify- I got one PC that I work on and got another one, which has Ubuntu Server running. I even managed to connect them through the router, which I made to work as a switch. I can see the Ubuntu Server on my Windows PC in "Network", but it's empty, I can't see any files. I tried to share a folder etc/www on Server, but it shows an error saying something about right, that I'm not this folder's owner. I guess I'm not doing the right thing at all, am I? Even if I could see shared folder on my Windows PC- I would still be not able to type "somedomain.com" on Windows PC and access for example index.php or MySql database. So, the question is- how do I configure Ubuntu Server to be accessible from Windows PC?

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• Problem communicating with one machine in my domain

  - by pmaroun

  Context: 3 HyperV guest images (DC, SQL, MOSS) 1 internal network 1 domain (PJM.COM) DC: 192.168.0.192 SQL: 192.168.0.153 MOSS:192.168.0.160 I am having communication problems from/to the MOSS machine from the other two. I removed the MOSS machine from the domain and cannot rejoin. When I ping the MOSS machine from DC, I get the following response: Pinging MOSS [192.168.0.152] Reply from 192.168.0.192 Destination host unreachable (4 times) When I ping the MOSS machine from SQL, I get the following response: Pinging MOSS [192.168.0.152] Reply from 192.168.0.153 Destination host unreachable (4 times) From the MOSS machine, I can ping the server names, however I cannot ping the FQDN. When I ping from the DC and SQL machines, I get IPv4 addresses. When I ping from the MOSS machine, I get IPv6 addresses. I'm a developer and don't know what steps to take to resolve this issue. Please help!?

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• Does Windows 7 VPN push Client DNS?

  - by K20GH

  I'm using a VPN in conjunction with my iPad (no OpenVPN sorry!) so have just configured the Windows 7 PPTP VPN and i've got it working fine. However what I need to know is will it force my iPad to use the global DNS settings configured in Windows, or will it use the DNS settings i've set on my iPad? I've got unblock-us at home and would like to use it on my iPad while i'm away. Since unblock-us uses IP addresses it wouldn't work on my iPad outside of my home network, hence the use of a VPN ;) The only issue is I don't want to use unblock-us DNS's on my Windows box, only on my iPad

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• Oracle EZConnect in Mediawiki

  - by raindog308

  Mediawiki supports Oracle and I'm trying to configure it in the installer. The installers says you can use EZConnect...something like: user/pass@//server.example.com/dbname or since the installer has fields elsewhere for user/pass server.example.com/dbname The installer includes a link to the EZConnect docs: http://docs.oracle.com/cd/E11882_01/network.112/e10836/naming.htm. All the examples in that doc include a forward slash. But every combination I've tried results in an error like this: Invalid database TNS "sever.example.com/service_name". Use only ASCII letters (a-z, A-Z), numbers (0-9), underscores (_) and dots (.). I can't find any examples of EZConnect that don't include a forward slash. That error is from Mediawiki, not Oracle. I'm tailing the listener log and there is no connection made - Medaiwiki is returning an error without trying to connect. I'm using php OCI8 with the Oracle instant client. I don't have a tnsnames.ora setup for this client - which is kind of the point of EZConnect. I did write a test php script that connects via oci_connect just fine. Has anyone configured Mediawiki to use Oracle with EZConnect? If so, what did you use in the installer?

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• How can I have a Windows 7 VMware guest without mouse support?

  - by Matthew Read

  Despite having vmmouse.present = "FALSE" mouse.vusb.absDisabled = "TRUE" pref.motionUngrab = "FALSE" in my .vmx file and a customized VMware Tools installation on the guest that does not include the mouse driver, I somehow have fully integrated mouse support for my Windows 7 VM. I can smoothly mouse from the host into the guest without needing to click or Ctrl+G in and Ctrl+Alt out. I don't want this because of the issues it causes with games. How can I get the VM to have no special mouse support while still having VMware Tools installed for its other functions (network, graphics, etc.)? The mouse works as I want without VMware Tools but not otherwise — again, despite not installing the mouse driver and having all those settings trying to disable it. Device Manager shows that the generic Windows PS/2 mouse driver is being used and not the virtual mouse driver. Guest and host are both Windows 7 Ultimate SP1, x86 and x64 respectively. I'm using VMware Player 3.1.4 and the VMware Tools installed is the latest, 8.4.6.16648.

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• ubuntu server refusing connections via port forwarding

  - by Matt

  Getting some really weird behavior from our Ubuntu server... it's behind a Verizon router firewall with port forwarding (port 8080 to port 80 on the server), and we've been having issues accessing it via this external IP. From within the network, it appears to respond normally (I can access it via web browser and SSH), but refuses connections through port forwarding (using our static external IP). The strangest thing is that it actually responds to external port-forwarded connections right after being restarted, but quickly lapses back into this pattern of refusing external connections. I'm a bit of a server newbie (I'm actually a programmer in a small startup that just lost their server ops guy, urgh) so this is all trial by fire for me. Does anyone have any advice on what could be going wrong here? Any help would be appreciated, thanks.

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• HP Virtual Connect and VLAN Tagging

  - by JaapL

  We have a c7000 chasis with the ability to have 8 uplinks per ESX host. Only 6 are currenlty active. I have a Virtual Switch with multiple vlan port groups and all the VMs are working fine. Recently we've been asked to setup network load balancing for one of our VMs, so we had our Virtual Connect engineer activate the last two uplinks. We then created a new vSwitch and added the two new uplinks to this vSwitch. We then moved the VM to this new vSwitch, but we get no connectivity. What could be the issue? We also added the appropriate VLAN ID. The VConnect engineer says everything is configured correctly and networking TEAM says the appropriate trunking is setup, so we are at a loss...

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• syslog log of TCP packet

  - by com

  Occasionally, I noticed a lot of following messsages in syslog Nov {datetime} hostname kernel: [8226528.586232] AIF:PRIV TCP packet: IN=eth0 OUT= MAC={mac} SRC={sourceip} DST={destinationip} LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=20361 DF PROTO=TCP SPT=39950 DPT=37 WINDOW=14600 RES=0x00 SYN URGP=0 On the Internet, I found that DOS attack may cause such type of output, unfortunately, I don't understand what does this log mean. The only thing is clear for me is this log is related to network. The source host is the host where nagios is installed. Does it mean nagios somehow does behave well? And what does it mean at all?

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• Type 1 Hypervisor on the desktop

  - by Blazemore

  I have a powerful home PC, and I've used VirtualBox to run Linux distros in Windows (and vice versa). I'm interested in trying out a lightweight type 1 hypervisor to run all my operating systems (Windows 7, Debian, Arch) and was looking for suggestions of which to pick and how to implement this. From what I gather, a type 1 hypervisor is a lightweight OS which simply provides VM management functionality. Will I get reasonable performance under each guest OS? Can all the guest OSs have access to a shared data drive, or is is best to have a storage server in another guest OS and mount it over the virtual network? What about gaming, is this feasible, or will I realistically need to run Win7 on bare metal? I'd appreciate any input.

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• TPM had to be reintialized: Does a new recovery password have to be uploaded to AD?

  - by MDMoore313

  Some way some how, a user's machine couldn't get read the bitlocker password off of the TPM chip, and I had to enter the recovery key (stored in AD) to get in. No big deal, but once in the machine, I tried to suspend bitlocker per recovery documentation, and got an error message about the TPM not being initialized. I knew the TPM was on and activated in the BIOS, but Windows still made me reinitialize the TPM chip, and in the process it created a new TPM owner password. I found that odd because it prompted me to save this password or print it (there wasn't an option not to), but it made no reference of a recovery password, nor did it back this password up to AD. After the user took her laptop and left I started thinking that if the TPM password change, does the recovery password change also? If so, that new recovery password will need to be uploaded to AD, but MS' documentation doesn't make that clear, and doesn't back up the new recovery key (if one exists) to AD automatically when the group policy says it must, and from a network standpoint AD is accessible.

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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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• Best way to backup Active Directory with a single domain controller

  - by John Hall

  I have a domain with about 15 users and a single Windows Server 2008 domain controller. Some recent issues with my RAID controller have made me reconsider how I go about securing the AD data. Currently I run a System State Backup nightly. However, it seems that it is impossible (or at least difficult and unsupported) to restore that to any other machine than the one from which it was taken. Adding a second DC to the domain seems expensive and overkill for such a small network. Is there no other way to backup the AD data?

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• Error 800 while connecting to VPN

  - by Aamir

  I am trying to connect to my office network through VPN. It used to work fine earlier but now as soon as I hit connect, I get Error 800: Error 800: Unable to establish VPN Connection. The VPN server may be unreachable, or security parameters may not be configured properly for this connection. I am using Windows XP and I am able to ping the VPN server successfully. I have Symantec Endpoint Protection installed (if it matters). I have tried disabling it as well but nothing changes.

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• multi-thread in mmorpg server

  - by jean

  For MMORPG, there is a tick function to update every object's state in a map. The function was triggered by a timer in fixed interval. So each map's update can be dispatch to different thread. At other side, server handle player incoming package have its own threads also: I/O threads. Generally, the handler of the corresponding incoming package run in I/O threads. So there is a problem: thread synchronization. I have consider two methods: Synchronize with mutex. I/O thread lock a mutex before execute handler function and map thread lock same mutex before it execute map's update. Execute all handler functions in map's thread, I/O thread only queue the incoming handler and let map thread to pop the queue then call handler function. These two have a disadvantage: delay. For method 1, if the map's tick function is running, then all clients' request need to waiting the lock release. For method 2, if map's tick function is running, all clients' request need to waiting for next tick to be handle. Of course, there is another method: add lock to functions that use data which will be accessed both in I/O thread & map thread. But this is hard to maintain and easy to goes incorrect. It needs carefully check all variables whether or not accessed by both two kinds thread. My problem is: is there better way to do this? Notice that I said map is logic concept means no interactions can happen between two map except transport. I/O thread means thread in 3rd part network lib which used to handle client request.

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