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• Server 2012 intermittently fails to respond to pings from single host, even with firewall disabled, but responds to non-ICMP requests fine

  - by James Westbury

  This one is kind of weird. I've got the following machines involved: DC01 - 10.1.2.42, Server 2012, domain controller & DNS server, physical machine nagiosv - 10.1.2.35, CentOS 6.4, Nagios, virtual machine CB01 - 10.1.3.81, Ubuntu 12.04 LTS, couchbase server, virtual machine So, I noticed something was wrong while configuring this new Nagios VM. I started seeing DC01's state flapping. I logged into nagiosv when I saw this happening, and attempted to ping DC01, both by FQDN and its IP address. Neither worked. I tried pinging the machine from CB01, which is another VM on the same virtual switch/physical NIC as nagiosv, and that worked fine. Pings still failing from nagiosv at this time. DC01 is also an internal DNS server, so I ran dig google.com from nagiosv, and was able to run a query against DC01 just fine: ;; Query time: 1 msec ;; SERVER: 10.1.2.42#53(10.1.2.42) ;; WHEN: Fri Nov 1 07:53:51 2013 ;; MSG SIZE rcvd: 204 Pings still failing from nagiosv, though. I can ping from DC01 to nagiosv, and that works, and I can still ping from other VMs on the same physical NIC into DC01, and that works. I should mention at this point that I've disabled the firewall on DC01 for testing purposes, and it doesn't make a damned bit of difference. (Even with the firewall enabled, I have a blanket exception for ICMP from the local subnet, so it shouldn't make a difference, but I figured I should test it anyway.) I loaded up Wireshark on DC01 and pinged it from nagiosv again. What I see is a bunch of echo requests coming in and not a single reply going back out. Filtered results here, showing all ICMP traffic during a 15-second period. A few more bits of info: There are no IP conflicts on the network. MAC addresses on the incoming pings match the MAC on the VM. There are no duplicate MACs on the network, as far as I can see. I have absolutely no idea why DC01 is failing to respond, here. Any ideas?

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• Server unable to communicate OUT, fine serving traffic

  - by jonoabroad

  We have several servers that are randomly loses the ability to communicate out to other nodes on the local network and internet. However websites are being served fine and we still have ssh access. A reboot seems to fix the problem for a few days. The servers are running 10.5.X and are fully up to date with software updates. Does anyone have any opinions, we think it is probably an ISP router, but we are guessing. Cheers Jono

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• Workgroup/Domain for a DLP software

  - by Rohit

  A client has inquired me for a DLP software to lock USB and CD Drives. I contacted few companies and the DLP tool needs a Domain from where the software can control the nodes. The client says that they have 55 machines in a WorkGroup and also has 1 server. I am not following what exactly is a WorkGroup and a Domain. The DLP tool specifications say that the network must have a Domain and Active Directory Services.

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• secure data transport between web server and database server

  - by atypicalgeek

  I asked this question in stackoverflow and it was suggested to try here so here goes... I'm planning on provisioning a web server and database server in a server farm environment. They will be in the same network but not in the same domain, both windows server 2008 and the database server is sql server 2008. My question being, what is the best way to secure data in transport between the servers? I've looked into IPSEC and SSL but not sure how to go about implementing either.

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• MBPro, mid 2010 can't see Dlink DIR655 signal after sleep etc

  - by user88114

  This is my son's MBP 7,1 running Snow Leopard 10.6.7. Router signal is fine since iPad, Wintel on same table 20 feet from router are fine. the MBP however frequently wakes and fails to find the internet. iStumbler can see 1 neighbours hub and my garden hub are there but can't get to the normal DIR655 wifi... no ping no en0 or en1 device seems to exist. Airport off and on does not help. He just resets router and it all works but this does not please me! I must admit the winter sometimes seems to loose connect too, but less so. The DIR655 (hardware rev A3) is on the original EU firmware 1.10, I'm cautious about jumping to latest 1.31EU since no downgrade seems to be possible and that feels a bit risky as so much is set up and working fine. If I use the DIR655 admin web and release the lease the MBP has then wake it all worked OK. So I suspect lease timing/locking issue but unsure how to check up, plus why iStumbler seems to say the network is not visible at all when I sit on the iPad right next to it just fine.. I do not think there are any channel overlaps and we also have RFquiet DECT phones (Orchid) that are silent until lifted or called. Anyway signals all show low interference and high throughput except for this failure to connect. Just walked the MBP to the garden office and iStumbler now sees the more distant DIR655 signal although it will not connect to it (does not show under Sys Prefs NetNetwork names) even after airport off & on... It also refuses to connect to my garden network (an old Belkin acting as AP wired to DIR655), the signal it can see and even net name in Sys Prefs NetNetwork names (2 mins later):NOW both names ARE visible, but both fail to accept the correct WPA2 password and keep asking again after failing to connect. IT ALL MAKES NO SENSE TO ME. Just revoked the lease for the MBP on DIR655 and no changes although this seemed to help MBP wake into connection 1 hour ago. OK a bit of walking about to report. Carried MBP across garden towards DIR655, a few other wifis show up on iStumbler, low signals all channel 1. Right next to DIR655 but iStumbler not showing it, although most other wifi's have gone. I'd say iStubler is suffering timeouts&hangs but hard to be sure. Lots of attempts to Airport on/off, join other etc and suddenly I get to connect, get given new IP (I revoked), can browse. Walk away, connection drops quite soon at 30 feet then reconnected briefly then died again. MUST ATTEND ELSEWHERE FOR A BIT...

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• Running Chromium Flow on a USB disk to boot on school computers?

  - by user38008

  So I gonna make a USB bootable drive of Hexxeh's ChromiumOS Flow. I want this to be able to boot into it on my school computer. The computers use Novel network and each student gets their own login. Can I use my USB drive to boot into ChromiumOS from the schools computer? I dont need to access the files on my Novel Login. So can I even do this? Thanks.

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• isa 2004 - banned site rule cause slow internet

  - by Holian

  Hi Gods, We have windows server 2003 with isa 2004. Our clients uses internet with proxy. We have two isa rule: order name action protocolls from/listener to condition 1. trafic ALLOW all outbound all networks all networks all users 2. FTP ALLOW FTP Server EXTERNAL/INTERNAL/Local host 10.1.1.1 So we have to "bann" a few webpage (like facebook, youtube...etc...), so we make a new rule 0. banned DENY HTTP internal denied pages all users In the denied pages we have the *.facebook.com domain set. After we enable this rule, the entire internet slows down. The banning rule works well, redirect to an internal site, but the other sites.... If i open a page..it normally takes 3-10 sec to load, but after this rule this time is: 2-4 minutes. In the monitor / logging menu we got a few FAILED CONNECTION ATTEMPT like: Log type: Web Proxy (Forward) Status: 304 Not Modified Rule: All local traffic Source: Internal ( 10.1.1.1:0 ) Destination: External ( 172.24.28.22:3128 ) Request: GET http://www.konyvelozona.hu/wp-content/uploads/nyugdijas-holgy-2.jpg Filter information: Req ID: 17270b72 Protocol: http User: anonymous Additional information Client agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.3072... Object source: Verified Cache Processing time: 9047 Cache info: 0x18801002 MIME type: - In the event log we got a few log: Description: The Web Proxy filter failed to bind its socket to 10.1.1.1 port 80. This may have been caused by another service that is already using the same port or by a network adapter that is not functional. To resolve this issue, restart the Microsoft Firewall service. The error code specified in the data area of the event properties indicates the cause of the failure. The failure is due to error: 0x8007271d The Web Proxy filter failed to bind its socket to 127.0.0.1 port 80. This may have been caused by another service that is already using the same port or by a network adapter that is not functional. To resolve this issue, restart the Microsoft Firewall service. The error code specified in the data area of the event properties indicates the cause of the failure. The failure is due to error: 0x8007271d If i tpye: netstat -o -n -a | findstr 0.0:80 then i got, tcp 0.0.0.0:80 0.0.0.0:0 LISTEN 4 udp 0.0.0.0:8031 *.* 2780 udp 0.0.0.0:8082 *.* 2780 Some month ago we installed XMAP, but now we only use mysql. Apache service stopped. In the Xamp port check menu i see: Service POrt Status Apache (http) 80 Process: System Maybee this is the problem? I dont know what should i do now... Thank you folks.

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• Installing Linux on a Windows Computer Partition

  - by bryan sammon

  I was thinking of setting up a partition on my Vista comp and installing Linux on that partition. I was gonna install Ubuntu on this partition. I was wondering if the equipment I have (i.e. video card, mouse, keyboard, network card) would be potentially unable to work on a linux platform? Any advice on doing this? I havent started yet, just doing my homework. Thanks alot, any answer is always appreciated

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• Simple EXPECT script to execute remote command and displat output

  - by s.mihai

  I am trying to connect to a network router and execute show status on it. Currently i am using: spawn ssh -o StrictHostKeyChecking=no [email protected] expect " * ? password:*\r" send -- "secretPassword\r" sleep 5 send -- "show status\r" sleep 10 send -- "exit\r" It dosen't work, i get stuck at [email protected]'s password:i've tried entering the password but it does not work, i get: server1:~# secretPassword -bash: server1: command not found server1:~#What am i doing so wrong here ... ?

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• How do I get the IP address of a switch.

  - by Atilla Filiz

  I have a wireless AP+switch which I configured years ago, before moving, and haven't used for a while. Now I want to reconfigure it for my new network, but have no idea what I set as its IP address(It was probably something 192.168.xx.yy). What is the best way for discovering its IP? A script to spam the whole address space?

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• Home computer as ssh bridge

  - by pistacchio

  Hi at work, due to our network configuration, i cannot ssh external servers. We are on a Windows environment. I need to ssh a server of mine, but i can only exit from our LAN via port 88. How could I use my home MacOs box to accept an http connection from my home computer and route it via ssh to the server i need to' connect to? Thanks.

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• HVM virtualization with PV drivers on XenServer

  - by Nathan

  Is it possible to create an HVM guest in XenServer 5.5 that uses PV drivers for disk and network without being fully paravirutalized? This should give me decent performance from the VM without having to jump through hoops to create a PV guest when a pre-built template doesn't exist. Since PV drivers exist for Windows, and XenServer provides templates for windows that use HVM virtualization this must be possible, I just don't see how to configure this myself.

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• Wifi Snooping over phone

  - by pulsarjune

  I connect to the wifi acccess-point at work, but recently I suspect that data on my phone is being snooped-out from my phone connected to my office's Wifi network. [Phone Model: Sony Ericsson Xperia Neo V, Android v2.3; Wifi accespoint: Belkin G] How can i check my suspicion? Or What are the ways i could get over them? (obviously i want to stay connected to the wifi n/w) Any thoughts on these points?

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• Virtual Hard Drive not booting - VMWare

  - by Chloraphil

  I have a .vmdk (VMWare hard disk) file that I cannot use as the lone disk in a new virtual machine. If I attach it to an existing virtual machine then it works fine. It has Windows Server 2003 on it. When I attempt to boot the new VM it attempts a network boot. EDIT: VMWare Workstation 6.5 I could not find a PXE option in the settings, and I did look in the VM config file for "PXE" but did not find one.

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• Can Airport Extremes handle NTFS external drives?

  - by Electrons_Ahoy

  I've got an Airport Extreme and an external USB Hard Drive formatted with NTFS. (And a LAN of Windows XP Machines.) The drive works perfectly when connected directly to a PC. When it's connected to the AE, however, the Airport Utility sees the drive and lists it in the Disks list, but the drive doesn't appear on the network (as near as I can tell.) Can the AE handle NTFS formatted disks? The documentation is vague on that point.

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• How do I find a file that begins with a phrase in Windows Search?

  - by plasmuska

  Hi Guys, What is the syntax for searching a file with file name that STARTS with a certain phrase? Example: I have two files: 60933 blahblah.xls PZ 60933 blahblah.xls I would like to search only for the first one but Windows Search always returns two results. I have tried these but none of them seem to work: filename:60933 filename:^60933* filename:60933..xls My setup: Windows XP Pro CZ, Windows Search 4, files are located on indexed network share.

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• problem with ubuntu gnome environment

  - by Kukmedis

  Hello, after removing gnome-panel gnome doesn't start at all. I get black screen and terminal upon turning PC on. It would seem no problem but wireless network doesn't start too, so i have no internet connection to "apt-get install--reinstall". Any suggestions? Thank you

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• How to find the IP of the DHCP server - Red Hat Linux

  - by Nishant

  There seems to be some other DHCP server installing my linux machine on the same network . How do I check the IP and remove the same ?

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• Persistent TCP connection in DMZ

  - by G33kKahuna

  A vendor is requesting to allow persistent tcp (not port 80) connection between a server in the DMZ and the internal network. I don't have much experience with this setting. Can anyone shed some light on disadvantages of allowing persistent connection? Guidance is much apprciated.

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• Why does not my Windows XP connects to the wireless?

  - by Amitabh

  I have a dell machine with Windows XP. For the past two days its not connecting to the wireless network. I have another machine with Windows 7 and its connects with the same wireless. This started happening since yesterday when I found a Virus (spy-agent.bw.gen!mem) on my machine which I think I managed to remove using Avira.

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• Symantec Gateway Security 320 VPN/Port Forwarding trouble

  - by Owl

  How do I check to see if port forward is enabled with one of my dynamic tunnels on this device? I'm having trouble using a feature in our software that requires a vpn to be used. My firewalls shows it as connected but I'm unable to ping the subnet ip. Our software vendor told me that port forwarding might be causing this problem, but I didn't set up this network I'm on and I don't fully know symantec hardware.

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• Exchange 2010 Internal Auto Discover Migrate away from current .local DNS name

  - by Bryan

  We have an Exchange 2010 Server, running within our Active Directory domain, with an internal hostname of server.example.local. The server is configured for Exchange anywhere, but currently has a self signed certificate with a name of server.example.local installed. Internally, clients connect and work fine, but externally, we are having certificate errors as you would expect. I'm about to purchase a UCC SSL Certificate to install on the server with all the relevant SANs on the certificate to correct this, but due to obvious problem obtaining a trusted cert with .local as a subject alternative name, I'm looking to configure clients on the internal network so that they don't use any reference to the .local hostname. I've configured our external DNS name for the server as exchange.example.com, and have created an CNAME for autodiscover.example.com which also (correctly) points to exchange.example.com. I've also configured internal DNS records for these two hostnames which point to the internal interface of the same server. I don't anticipate any problems here. I'm now trying to reconfigure Auto Discover internally, so that Outlook attempts to connect to exchange.example.com. I've followed the steps in KB940726 to prepare for this, and this appeared to work fine. No errors were generated and I was able to verify the CAS name in AD using ADSI edit. I've just tried testing this with a newly created test user account complete with a new Exchange mailbox, and Outlook 2007 connects fine on the internal network, but looking deeper in the Exchange profile, Outlook is still resolving the server name as server.example.local. Could it be the self signed cert, that is causing Outlook to display the server name as server.example.local, or is there still something wrong with my internal autodiscover configuration? Edit I've proven it isn't the certificate that is responsible for outlook returning server.example.local, by installing another self certified certificate with a name of test.example.com. When creating a new outlook profile, I get the mismatch error I'm expceting, but after accepting the cert, and finishing the config of the Outlook profile, again it still shows server.example.local as the server name. This means that if I were to purchase the UCC cert now, that external client would work fine, but internal clients would show a certificate name mismatch. Any ideas where to start diagnosing this?

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• Why do server administrators not open up IMAP on an Exchange server?

  - by Jon

  In a corporate environment running Exchange and Outlook clients connecting to it why do server administrators not allow IMAP to be turned on for those that would like to connect to the server using IMAP? I'm assuming the simple answer is port attacks and please excuse my naivety but does Exchange not suffer the same problems or is it because its behind the firewall and within the corporate network?

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• Cracking WEP with Aircrack and Kismet

  - by Jenny

  Just a minor question, but I notice with aircrack when it lists networks, it does not list the encryption type of each network. Which seems fair enough, as you can use Kismet, however on my machine when I end kismet and the server, the monitor interface is not removed and I cannot remove it manually, which screws with aircrack. SO, is kismet needed to view encryption types of networks, and if so how do you use it peacefully in unison with aircrack?

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• wireless ethernet adapter with EAP-PEAP?

  - by Joseph

  We have a wireless network set up to support WPA or WPA2 with AES or TKIP encryption and EAP-PEAP authentication. Users are wanting to connect devices that don't have the ability to do EAP-PEAP but have ethernet ports. I have found a wireless printer server that can do this, but I have yet to find a wireless ethernet adapter that can. Has anyone seen one with this ability?

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