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• Discovering proxy servers on a private network

  - by AIB

  Suppose that I am in a private network of computers (say each having ip addresses 192.168.. ). Some of the machines( we have no information regarding their ip, name and no physical access to the servers) in the network are connected to internet and they run an http proxy at some port say 3128. Is there a program which can be run on Windows or Linux which will give me the list of machines(ip addresses and ports if possible) acting as proxy servers?

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• iptables - Allowing Established Sessions?

  - by Sandro Dzneladze

  I'm learning how to use iptables on ubuntu server. Can you please explain to me what "Allowing Established Sessions" means and why should I include it in rules? sudo iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT I understand concept of allowing specific ports and blocking others sudo iptables -A INPUT -p tcp --dport ssh -j ACCEPT block all sudo iptables -A INPUT -j DROP But I don't get the concept of allowing established session. Thanks. S.

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• RAID level hard drives?

  - by JT

  Hi All My Motherboard has 4 internal SATA ports. I am considering a linux software raid. I plan to use this for backing up my work movies, music etc Do I need to spend the money on RAID Level drives? Or am I safe with standard hard drives? a 2TB Hitatchi 7200 is like $89 at NewEgg where a Samsung F1 RAID 1tb is $150.00 Thoughts?

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• What is this port/connector on my laptop?

  - by iconiK

  I have this port on my laptop and I have no idea what is it used for. It's not even listen in the laptop technical specifications. The laptop is a HP Pavillion dv5-1101en. Here is a larger image showing all the ports on the laptop: Left to right: D-sub 15 pin (AKA VGA) Unknown port Ethernet HDMI eSATA USB IEEE 1394 (AKA FireWire)

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• Port scanning from localhost

  - by Jaels

  I see lot of tcp connections on different ports on my server with 'TIME_WAIT' status. Just simple port scan, but i cant see ip address of this bastard because connections is going from my nginx. Can you please give me a tip how can i see IP address of this bastard? Here is example: [root@vh9 ~]# netstat tcp 0 0 srv:http srv:53280 TIME_WAIT tcp 0 0 srv:http srv:53536 TIME_WAIT tcp 0 0 srv:http srv:52768 TIME_WAIT tcp 0 0 srv:http srv:53024 TIME_WAIT

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• USB mouse shuts down the laptop!

  - by Ryan

  For the past two days, whenever I plug in my USB mouse (which has been working for a long time, previously) into the laptop, my computer restarts! I tried changing mice, but the same thing happens. I have 3 ports, usually, I try one port and the laser does not come on, then I try another one and the laser comes and and off, then I again take out and put it in any port and the damn thing just turns off the computer. Specs: Windows 7 Ultimate 64-bit, 4GB RAM, Fujitsu 532ah i5 laptop

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• Do I need a hardware firewall for Win 2003?

  - by user531723

  We have had a Win 2003 server at a co-lo for a while. It is used as a web server and has a very cheap hardware firewall between it and the internet. Ports 3389 and 80 are the only ones forwarded to the server. I am doing some upgrading and wondering if I really need the firewall. Are there any drawbacks to just using the Win 2003 built in firewall to make sure only traffic on 3389 and 80 get through?

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• does 8-bit processor have to face endianness problem?

  - by Grissiom

  If I have a int32 type integer in the 8-bit processor's memory, say, 8051, how could I identify the endianess of that integer? Is it compiler specific? I think this is important when sending multybyte data through serial lines etc.

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• VB6: How to interrupt another software from passing detial and override the details with another inf

  - by Mahmoud

  Hey there i wanted to know, is it possible let say windows wants to collect my Flash serial number for verification, and i want to over ride it and send fake info to bypass the checking step if yes and there is a guide please inform me

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• Multi-Column Primary Key in MySQL 5

  - by Kaji

  I'm trying to learn how to use keys and to break the habit of necessarily having SERIAL type IDs for all rows in all my tables. At the same time, I'm also doing many-to-many relationships, and so requiring unique values on either column of the tables that coordinate the relationships would hamper that. How can I define a primary key on a table such that any given value can be repeated in any column, so long as the combination of values across all columns is never repeated exactly?

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• Understanding EXE Internals

  - by Steve

  I was attempting to install an exe that requires a serial number before the install, which the vendor has not provided to us yet. This got my wheels turning about whether there is any information that can be gained from viewing an exe using a hex editor/VI/etc? Using VI to view an exe, I can see some sections of plain text, but it is difficult to determine what it refers to without any context around it. Is it possible to determine any information by reading an exe? Thanks

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• XAMPP won't start because I'm already running MySQL on port 3306

  - by JellicleCat

  I'm trying to start XAMPP, but it fails with only the word 'Busy' in the Control Panel console. I ran xampp/install/portcheck.bat to see if the ports were available, and I see that port 3306 is busy (because I'm running MySQL as a service on it). I suppose that XAMPP wants to take over and run MySQL on that port. Can anyone tell me how to get XAMPP to just make use of the existing server and not try to control it itself?

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• How do you keep track of installed/used software/systems/services in your organisations server infr

  - by edgars

  I'm interested in any software, experience or guidelines listed that help to deal with listing installed services, their primary user (or business person that is responsible for this service), domain names, ip addresses, ports in your servers. Servers are both Windows and Linux, so licenses are also good to track with all of this information. Scale of the infrastructure in question - 20-50 servers. Currently we have no better idea as to use Excel for it.

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• select with conditions on array of composite types (postgresql)

  - by valodzka

  For example I have type: CREATE TYPE record AS ( name text, description text, tags text[]) And table: CREATE TABLE items ( id serial, records record[] ) How can I select all items with records with tags 'test' (without using PL/pgSQL)?

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• Which connector do I need for a "line level" subwoofer?

  - by Ben Brocka

  I've got a separate pair of speakers and I'm looking at adding a subwoofer (this, specifically). I noticed on the detail page it's inputs are listed as such: Inputs: Speaker level, line level If I'm not mistaken "line level" are the standard 3.5 audio jacks on your motherboard/sound card, right? My motherboard has the standard 6 ports for sound, if I get a subwoofer like this can I simply plug the input into the orange 3.5 jack? My audio software supports up to 7.1 so software-wise, 2.1 wouldn't be a problem.

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• VPN Connection Causes Internal LAN Connection Loss with Server

  - by sleepisfortheweak

  I've tried configuring basic PPTP VPN at my small business using a number of different tutorials. As far as I can tell, the actual VPN connection worked fine, but upon connecting a client, the Server 'disappears' from the internal LAN. The RRAS service must be stopped before the connection is restored. My Setup: The network is simply a DSL Gateway/Router to the outside functioning as NAT/Firewall/DHCP. The server is a Win Server 2008 machine at fixed IP 192.168.1.200. The server has 1 NIC, so I used the 'custom' option when configuring RRAS. The RRAS settings should be default except that I've disabled ports for connection types I'm not using and reduced PPTP ports to 10. I've also created an address pool and disabled DHCP packet forwarding. The server only functions as a File Share and now a VPN Server. Local LAN computers all have mapped network shares to the server authenticated based on Local User/Group setup on the server. The Problem: The moment a client connects through VPN, the server 'disappears' from the local network. All mapped drives disconnect and there is no response to a ping 192.168.1.200. Even if the client disconnects, the server does not re-appear at that address until the RRAS service is stopped. I've Tried: Using an Address Pool inside and outside the local subnet. Using DCHP Relay Checking Inbound/Outbound filters (none enabled) The fact that nothing I've tried has had any effect, and that I can connect and successfully obtain an IP tells me that it's something more fundamental I'm missing. My gut tells me that it's something to do with the second IP address added by the VPN client somehow taking over the interface or traffic from the local LAN accidently getting routed to the VPN client instead of handled at the server once RRAS has become 'active' when a client connects. Hopefully this may be obvious to someone with real IT experience. I've been doing this a while and almost never been stumped. I'm starting to think it might actually be something tricky since my setup is pretty basic yet refuses to work. I'll be happy to include more info if this doesn't ring any bells right away for anyone. Thanks

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• Configuring an EH-WIC Card on Cisco 1941 Router

  - by Olanrewaju T

  I have a Cisco 1941 Router that has just two ports for Gigabit connection but wanted more so I got a four port Cisco EH-WIC Card and connected it to it. I have been trying to assign IP address to the port GigabitEtnernet 0/0/0 because I have a cable already connected to it whose device I want it facing the router directly because I dont want to NAT its address. I want to assign the physical address on the port. Kinldy help if you understand what I am saying. Regards

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• Share PC over network

  - by Sachin Verma

  I have a server installed on one local Win7 machine (say as 192.168.2.14:8080/myAPP) and I want to access that server from different computer (say ip as 192.168.2.16). Even they are connected to same network I can't access server from other computer. I guess the problem is in firewall. This is working when I disable firewall and not working when I allow certain ports in windows firewall but keeping firewall on (As a rule to allow incoming connections).

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• Using Lan Management port - which kind of switch for remote control?

  - by zephyrus

  Hello everyone, I have no expertize in server hardware, however i have some IBM X3550 7978 and HP DL 160/G6 servers with 2 Lan ports, and a management port (that seem to be another Lan port). Have anyone tried to use the management to control remotely the low level functions of the servers (reboots for example) ? Which kind of switch or other devices have you used for this? thank you Massimiliano

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• Cisco 1841 and routing /29 address

  - by Jonathan

  Could someone please explain in general terms how I'd configure a Cisco 1841 (2x ethernet ports) to route a public /29 address block (6 hosts) to my internal network. I wish to give the Cisco router one public IP and then several of my internal Windows servers will receive the other public IP addresses. Other hosts behind the router will access Internet via NAT. I'm a bit confused as I've only ever setup routers/firewalls that had a single public IP address with NAT and port forwarding to internal servers.

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• Monitoring VPN users on my network

  - by Fen0x

  My company runs filters on contents available for browsing and I have to check if everyone is respecting the browsing policies. Recently I have spotted some users activate OpenVPN on their workstations and i have discovered that they connect on port 443 of an external server and then use a proxy to circumvent the company filters. Is there any method to monitor VPN connections on allowed ports or to avoid the connections?

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• What's the difference between single and double quotes in Objective-C?

  - by Alex Mcp

  I'm working through a book exercise to generate some random serial number, and here's my function: NSString *randomSerialNumber = [NSString stringWithFormat:@"%c%c%c%c%c", '0' + random() % 10, 'A' + random() % 26, '0' + random() % 10, 'A' + random() % 26, '0' + random() % 10]; This works and has an output like: 2J6X7. But before, the 0s and As I had wrapped in double quotes, and an example output was 11764iÒ˜. What did I do wrong my first time around, and why did using single quotes fix it?

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• event .split() no response

  - by klox

  i've been modified the code like below function addtext() { var barCode = this.(text); $("#model").change(function() { barCode = $this.val(); var data = barCode.split(""); $("#model").val(data[0]); $("#serial").val(data[1]); }); }; but..still not separate..please help.

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• port 80 was blocked

  - by Kombuwa

  hi, in my home computer incoming port 80 was blocked. i gess it was done by some vires. did any body know how to open the closed port in xp. or any tool to open colosed ports.

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• Hotel like Wifi manager

  - by flpgdt

  Does anyone knows which are these systems that manages paid wifi networks and some hotels and airports? Even better, would anyone know a open/free project that would do or could be adapted to that end? The idea is simple, I want to let the network open at physical level so anyone can connect. After connected however, the clients would have access only to a specified page where they can logging in, and doing the necessary validations the router would allow these of those ports (or even everything) for his IP.

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