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  • Do TCP connections work differently within the same subnet?

    - by Dean
    I've encountered some network behaviour that confuses me while trying to get Java RMI working. I use netcat to connect to a local machine: [my_machine]$ nc -w 1 192.168.0.100 60000 && echo success success I try to do the same to my server: [my_machine]$ nc -w 1 my-servers-ip 60000 && echo success This doesn't work, unless I explicitly listen on the server socket: [amazon_ec2]$ nc -l 60000 [my_machine]$ nc -w 1 my-servers-ip 60000 && echo success success For the version that fails, the SYN packet receives a RST, ACK in response. I'm not too knowledgable about this stuff, at this point I only have wild theories such as the one in the question. Any ideas? Potentially useful details: Local Machine (192.168.0.100) - Macbook Remote Machine (Amazon EC2) - Amazon Linux AMI 2012.03 Security Group Settings: 22 (SSH) 0.0.0.0/0 1099 0.0.0.0/0 49152-65535 0.0.0.0/0 "iptables -L" shows no rules set

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  • Yahoo toolbar and local sites (e.g. Intranet)

    - by Klaptrap
    We have local sites running on IIS in regular MS Windows network. User base has IE, FireFox and Chrome. Local sites are isolated by host headers and DNS record created for the common IP accordingly. This is a regular set-up. Users without Yahoo Toolbar type http://intranet and the sites resolves. Users with Yahoo toolbar type http://intranet and the toolbar goes off to search for this site in public domain. This is irrespective to whether the address is typed into the browser address bar or the toolbar. All versions of toolbar and IE are affected. I cannot see a setting on the toolbar to switch this "irritating" behaviour off and simply un-installing the toolbar is not an option. Any ideas?

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  • Dhcp clients fail after successful import of server to new machine (win2k3)

    - by Tathagata
    I transfered the configs of a dhcp server from one server to another both running Windows Server 2003 R2 following http [://] support.microsoft.com/kb/325473. The new server has a statically configured ip(outside the scope) like the old one. Stopped the server on the old, and started up in the new server (authorized too) - but when I ipconfig /renew from a client its network interface fails with all 0.0.0.0 (or 169...*). I read somewhere I need to reconcile the scope to sync the new registry values ('ll try this tomorrow). What other troubleshooting steps can I take other than these (which didn't help)? Things work fine when the old server resurrects and the new one is taken down. The new server showed there was no requests for offer.

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  • Filemaker Server Not Installing and Windows Problems

    - by Shelly
    When I tried installing Filemaker Server 8.0 on Windows 2003 Server Standard Edition R2, an error message pop up that states: MMC has detected an error in a snap-in. It is recommended that you shut down and restart MMC. After this message pops up, Filemaker Server freezes. I'm also having problems with openssl and running executable files, but am not sure if the 2 are related. Error message for openssl states: Openssl.exe encountered a problem and needed to close. In one of the computers connected to the network running this same Server 2003 R2, when I tried double-clicking on Dr. Web antivirus to do a scan, nothing happens. I have done this many times before reinstalling the server, and it never gave trouble before this. Any help given is appreciated.

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  • Uralelektrostroy Improves Turnaround Times for Engineering and Construction Projects by Approximately 50% with Better Project Data Management

    - by Melissa Centurio Lopes
    LLC Uralelektrostroy was established in 1998, to meet the growing demand for reliable energy supply, which included the deployment and operation of a modern power grid system for Russia’s booming economy and industrial sector. To rise to the challenge, the country required a company with a strong reputation and the ability to strategically operate energy production and distribution facilities. As a renowned energy expert, Uralelektrostroy successfully embarked on the mission—focusing on the design, construction, and operation of power grids, transmission lines, and generation facilities. Today, Uralelektrostroy leads the Russian utilities industry with operations across the country, particularly in the Ural, Western Siberia, and Moscow regions. Challenges: Track work progress through all engineering project development stages with ease—from planning and start-up operations, to onsite construction and quality assurance—to enhance visibility into complex projects, such as power grid and power-transmission-line construction Implement and execute engineering projects faster—for example, designing and building power generation and distribution facilities—by better monitoring numerous local subcontractors Improve alignment of project schedules with project owners’ requirements—awarding federal and regional authorities—to avoid incurring fines for missing deadlines Solutions: Used Oracle’s Primavera P6 Enterprise Project Portfolio Management 8.1 to streamline communication with customers and subcontractors through better data management and harmonized reporting, reducing construction project implementation and turnaround times by approximately 50%, on average Enabled fast generation of work-in-progress reports that track project schedules, budgets, materials, and staffing—from approval and material procurement, to construction and delivery Reduced the number of construction sites by nearly 30% (from 35 to 25) by identifying unprofitable sites—streamlining operations at the company’s construction site network and increasing profitability Improved project visibility by enabling managers to efficiently track project status, ensuring on-time reporting and punctual project deliveries to federal customers to reduce delay penalties to zero “Oracle’s Primavera P6 Enterprise Project Portfolio Management 8.1 drastically changed the way we run our business. We’ve reduced the number of redundant assets, streamlined project implementation and execution, and improved collaboration with our customers and contractors. Overall, the Oracle deployment helped to increase our profitability.” – Roman Aleksandrovich Naumenko, Head of Information Technology, LLC Uralelektrostroy Read the complete customer snapshot here.

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  • VirtualPC/XPMode... trying to let a VM access pages served using IIS on the host machine

    - by John
    My host PC is running IIS7.5 under Windows7. I have a VM running XP to let me use IE6, but I've no idea what network settings on the VM/host are needed so the VM can access pages on the host. I thought if the host was 192.168.1.1, then from the VM I'd simply do http://192.168.1.1/... if I do this on the host it works but the VM can't see it. I'm assuming there are some shortcuts here rather than manually having to set up loads of permissions, e.g a shortcut way of letting the VM access the host maybe?

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  • Configure iptables with a bridge and static IPs

    - by Andrew Koester
    I have my server set up with several public IP addresses, with a network configuration as follows (with example IPs): eth0 \- br0 - 1.1.1.2 |- [VM 1's eth0] | |- 1.1.1.3 | \- 1.1.1.4 \- [VM 2's eth0] \- 1.1.1.5 My question is, how do I set up iptables with different rules for the actual physical server as well as the VMs? I don't mind having the VMs doing their own iptables, but I'd like br0 to have a different set of rules. Right now I can only let everything through, which is not the desired behavior (as br0 is exposed). Thanks!

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  • Custom LightDM sessions to launch an application

    - by zachtib
    I'm trying to set up Ubuntu to act as a kiosk running a custom application, and am trying to get a LightDM session built to automatically start it. Ideally, I'd like to have two sessions available from LightDM. The default would start my application fullscreened, and the other would open a minimal desktop in case any configuration (mostly connecting to a wireless network) needed to be done. I've done a lot of research over the last week on custom LightDM & Gnome sessions. I've got a custom greeter written for LightDM that can start either session, but I can't figure out how to add a specific application to the Gnome session that is ultimately started without just putting a launcher in the global startup directory, and I don't want to do that since I don't want the application starting when they open "configuration mode". Another problem I've run into on my current workaround is that the application doesn't fullscreen properly, which makes me think I'm not starting enough of a gnome session (currently it's just metacity, no panel or anything else). Edit: I found a solution. See http://www.webupd8.org/2011/11/make-applications-autostart-only-in.html

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  • Set 802.1Q tagged port on VLAN1 on Dell PowerConnect switch

    - by Javier
    I'm having big troubles when adding this Dell switch to my network. Here we use several VLANs to segment traffic. All switches (3com and DLink mostly) have configured the same VLANs, most ports are 'untagged' and belong to a single VLAN, except for the ports used to join together the switches (in a star topology), these ports belong to all VLANs and use 802.1Q tags. So far, it works really well. But on this new switch (a Dell PowerConnect 5448), the settings are very different (and confusing). I have configured the same VLANs, an the uplink ports are set in 'general' mode (supposed to be fully 802.1Q compliant), I can set the VLAN membership as 'T' on these ports for all VLANs except VLAN 1. It always stay as 'U' on VLAN 1. Any ideas?

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  • Which method of SQL Server 2005 or 2008 Replication is best for ease of field changes?

    - by Rick
    We need 15 minute warm updates from one SQL Server to another. Log Shipping looks good and appears easy to setup. We are also looking into Transactional Replication. The data only needs to copy one way. We have two main requirements: 1) The destination database needs to be a max 15 minute old copy of the source. It needs to re-try and get up-to-date if a network cable is unplugged for a while. 2) We would really like table (fields added or modified) changes in the source as easy as possible. Thanks in advance for all suggestions.

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  • Is Windows Server 2003 on 96 MB possible?

    - by Nifle
    I have an old laptop, a Pentium II with 96 MB. I have had Windows 2000 on it for ages, it was slow but usable. But now I have to upgrade since I can't get my USB-wlan drivers to install (the old PCMCIA network card broke). I would prefer to install Windows XP but I have no spare licence, but I do have a Windows Server 2003 licence. Do you think it's possible (and usable) to squeeze in 2003 on this computer? Edit: Unfortunately 2003 simply refuses to install on the laptop. It hangs with an error message (paraphrased) 2003 has detected a problem with your computer and has halted the installation to prevent damage. And then some error codes This happens very early in the installation while it's copying the installation files just after I accepted the licence. So I give up for now.

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  • Router used as ethernet bridge wont show up

    - by user1255271
    I have a Netgear router in my living room that has the wireless signal. It is connected to a Powerline plug that goes up to my bedroom. That is plugged into another router that is used as an ethernet hub. It's cables go into my PS3 and my server. The second router shows up as a hidden network on my laptop, and I can connect to it. But it is not listed as an attached device on my main router, and my laptop says that it connects straight to the main router, not the second one. How can I connect to this router? Aside from swapping the two? Thanks in advance.

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  • cannot boot ubuntu 13.10 with my usb, Can i change the kernal on my laptop to run it?

    - by Carlos Dunick
    Currently i am running 12.04 and looking for an upgrade to 13.10 I first tried a bootable 64bit usb and failed. With the message saying "Kernal requires an x86-64 CPU but only detected an I686 CPU Unable to boot please use a kernal appropriate for your CPU" then tried 32bit and same message came up. Is this due to my laptop simply being to slow? or can/should i change the kernal somehow? Acer Aspire 5710z Intel Pentium dual core processor, 1.73Ghz, 533 MHz FSB, 1 MB L2 cache. 2GB DDR2 lspci 00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03) 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03) 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03) 00:1b.0 Audio device: Intel Corporation NM10/ICH7 Family High Definition Audio Controller (rev 02) 00:1c.0 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 1 (rev 02) 00:1c.2 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 3 (rev 02) 00:1c.3 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 4 (rev 02) 00:1d.0 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #1 (rev 02) 00:1d.1 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #2 (rev 02) 00:1d.2 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #3 (rev 02) 00:1d.3 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #4 (rev 02) 00:1d.7 USB controller: Intel Corporation NM10/ICH7 Family USB2 EHCI Controller (rev 02) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2) 00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02) 00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 02) 00:1f.2 SATA controller: Intel Corporation 82801GBM/GHM (ICH7-M Family) SATA Controller [AHCI mode] (rev 02) 00:1f.3 SMBus: Intel Corporation NM10/ICH7 Family SMBus Controller (rev 02) 04:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5787M Gigabit Ethernet PCI Express (rev 02) 05:00.0 Network controller: Broadcom Corporation BCM4311 802.11b/g WLAN (rev 01) 06:00.0 FLASH memory: ENE Technology Inc ENE PCI Memory Stick Card Reader Controller 06:00.1 SD Host controller: ENE Technology Inc ENE PCI SmartMedia / xD Card Reader Controller 06:00.2 FLASH memory: ENE Technology Inc Memory Stick Card Reader Controller 06:00.3 FLASH memory: ENE Technology Inc ENE PCI Secure Digital / MMC Card Reader Controller

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  • Ubuntu: nautilus cannot browse samba shares

    - by Alexey Pilipchuk
    Got a problem with browsing samba shares with nautilus in ubuntu i can see workgroups but cannot go any deeper. On the other hand i can use smbclient and mount samba shares from command line. Also i can browse ubuntu shares from windows but not vise versa. So i suspect it is nautilus problem. Moreover it has never been working for me since very first ubuntu i used. Systems i tryed to browse shares on: Ubuntu 8-12 Windows Xp 7 Dune HD Max Could someone provide me with ideas how to diagnose this issue? Or describe how network browsing is implemented in nautilus Thanx in advance

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  • squid ip based authentication

    - by Ian R.
    I have 10 ip's on a VPS and squid3 installed. I want to lease all of them to 10 co-workers. The authentication should be ip-based. Basically I want to allow only their home ip address (not internal - we're not on a network) to connect to my squid. I would also like to offer them a dedicated ip from my outgoing addresses. I managed to get it working using username/password based authentication but some software do not support that feature so I would like to switch to this limit if possible. Any guidance/sample acl's?

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  • ts_block.vbs and mac intosh

    - by Eric Le breton
    I am using your excellent ts_blocker, release 20120530, on my server 2008 R2 Enterprise. it works very fine, i use the vbs script, launched with wscript. The only problem is that is does not work for users attempting to connect RDP from a mac intosh. With this machine the distant IP seems to be not recognized when the login fails. The IP is visible when the login is good (event ID 4624) but not when it fails (Audit failure event ID 4625) : then the IP is not to be seen in the event log ! In the "network information" of the event log entry is nothing given. Have you already been told of that and is there something to do ?

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  • Problem with PPTP VPN and internet

    - by Enriquev
    Hello, I have an internet connection the following way : Internet Modem <- FireWall(not a router, a firewall) <- PC Everything is setup so my pc has an external ip address, and my firewall takes care of blocking bad stuff. I connect by VPN to an external network, so I added a new connection using Windows Xp's "New connection wizard" (the vpn client that comes with Windows XP), it's a PPTP connection so I used all default settings. I put the PPTP server's IP, my username and password and I succesfully connected. I was able to have access to the external VPN ressources. The only problem is everytime I connect to this VPN, my computer cannot connect to the web anymore, no msn, no ping, no web. Is there anything special I should be doing?

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  • Computers displaying an unwanted password change prompt

    - by evesirim
    We run a small network of users from a central SBS 2008 server that handles group policy & AD. Most of our users operate under a policy that propts them for a password change every 6 months as a security measure, with a few administrator accounts & terminal machines not using the policy for the sake of ease as they are needed all the time. Recently all machines regardless of policy have started asking for a password change out of schedule. Some PCs run Windows 7 & some XP, though the password prompts don't seem to discriminate between OS. What could this be down to? Many thanks

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  • need for tcp fine-tuning on heavily used proxy server

    - by Vijay Gharge
    Hi all, I am using squid like Internet proxy server on RHEL 4 update 6 & 8 with quite heavy load i.e. 8k established connections during peak hour. Without depending much on application provider's expertise I want to achieve maximum o/p from linux. W.r.t. that I have certain questions as following: How to find out if there is scope for further tcp fine-tuning (without exhausting available resources) as the benchmark values given by vendor looks poor! Is there any parameter value that is available from OS / network stack that will show me the results. If at all there is scope, how shall I identify & configure OS tcp stack parameters i.e. using sysctl or any specific parameter Post tuning how shall I clearly measure performance enhancement / degradation ?

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  • Can't connect to the internet in Windows Vista

    - by Kola
    I have a Windows Vista computer which i have used for about 2 years without any issues. Recently, i started having problems connecting to the internet with this Vista computer. My other XP Computers are fine and can connect to the Internet. Regardless of wired or wireless connection, i am unable to get the Vista computer connected to the web. The Status remains "Limited" for IPv4 and IPv6. It also shows unidentified Public Network, and is able to connect to the router. However, there's a disconnection between the router and the internet. Any help will be greatly appreciated, i have been on this for 4 weeks now.

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  • Wifi and eth behavior

    - by r00ster
    I have a wireless router 150M Wireless Lite N Router Model No. TL-WR740N / TL-WR740ND. Normally, when I'm connected to the local network using eth0 I can ping other machines by issuing ping name. When I'm connected through wifi I have to issue ping name.domain.com. The machine is only visible in intranet. How to achieve the same behavior with wifi? The second problem is, that I can not connect to some external sites through wifi but through eth everything is ok. I guess that is related to some port forwarding, but I'm not sure. How can I resolve this issue? EDIT: I'm using Linux Mint.

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  • Setting up Amazon Cloudwatch to get an alert when you server is down

    - by Saif Bechan
    I have an instance running on Amazon EC2 that I turned into a webserver. Now I have been looking at cloudwatch, but I do not know if it is the correct tool for the job. Basically I want to get informed when the server is down, for whatever reason. Maybe the server got hacked, or the server shut down for whatever reason, I want to get a notification on that. I have enabled clouwatch, and tried to set up a alert, but I only see things like network in-out or cpu usage, an d metrix. Now I do not know if these will do the trick.

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  • Is there a schematic overview of Ubuntu's architecture?

    - by joebuntu
    Hi there, as enthusiastic, advanced Linux learner, I'd love to get an overview about Linux' architecure/structure in general. You know, like "the big picture". I'm thinking of a large schematic graphic showing what is what, who is who, what system (e.g. X) comprises which subsystems (GDM/Gnome/Compiz) on the way from a to z, from boot to interactive desktop, including the most important background services (auth, network, cron, ...). Maybe a bit like this: http://www.flickr.com/photos/pgc/140859386/ but way more detailed. There's bootchart, which produces very comprehensive charts, but they again are too detailed and difficult to get the "big picture" from. Is there such a thing? Possibly not for the whole System, but maybe for single subsystems? I had trouble searching for this, because using search terms like "scheme" or "architecture" pointed to the wrong direction (a tool called "scheme" or CAD software for linux). I appreciate any links. If there's interest in those schematic overviews and links, maybe someone could turn this post into a wiki post? Cheers, joebuntu

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  • Resolving host names to their domain name in an internal BIND domain

    - by Adam Plumb
    I'm setting up a domain on my home network for learning purposes, using BIND on CentOS to act as the name server. I've got the name server up and running as type master for my internal domain (plumbnicoll.family), and can do forward and reverse lookups from other computers in my LAN. For example, host office2.plumbnicoll.family correctly returns office2.plumbnicoll.family has address 192.168.1.3. What I'd like is to be able to resolve just office2 to its address, without needing to put .plumbnicoll.family at the end. Is this possible, or even desirable to do? I'm running a mixed environment at home with both Linux and Windows computers.

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  • Internet connection sharing windows server 2008 R2

    - by This is it
    I have one windows server 2008 r2, and that server has 4 network interfaces (3 private, 1 internet connection). I would like to share internet connection with other 3 networks. Windows server firewall should make logs of data that is transfered. It should not be possible to connect directly to private networks from internet. How could I do it? Edit: I tried with NAT in RRAS, but it doesn't work. Here is the configuration: Server: IP private:192.168.0.1 IP public: xx.xx.xx.xx client IP:192.168.0.2 Default gateway: 192.168.0.1 Public and private interface added in NAT section of RRAS.

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