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• Wireless keeps shutting off in Windows 7

  - by Nathan Adams

  I have Windows 7 Ultimate 32bit installed on a Dell Latitude XT Tablet and for the life of me I can't figure out this really weird problem. The symptom is that the Wireless will disconnect from the AP and if I tell it to scan again, it says there are no APs in the area. I do have another wireless card in the laptop and if I disable the first one and enable the second, I am able to get onto the wireless however if I want to use the first card again I have to restart. I tried enabling/disabling the device, nothing will kick start the wireless again in the first card without a restart. I even tried different drivers. So, it seems it is random but it does occur more often when there is increased network activity (ie downloading a large file). The laptop doesn't seem to be overheating. I have tried the following: Under "Change Advanced Power Settings" for the current power profile, I set the "Wireless Adapter settings" to "Maximum Performance". Under device manger, I went to the card in question, and went to the advanced tab and set the "Power Saving mode" to "MAX_PSP" Both cards I have seem to exhibit the behavior after awhile. Both models of those cards are: Dell Wireless 1505 Draft 802.11n WLAN Mini-Card Gigabyte GN-WS30N 802.11n mini WLAN Card Has anyone have any ideas or ran into this before?

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• Limiting bandwith on an Windows 7 machine

  - by Mihai Damian

  I need to limit the bandwidth on my Windows 7 x64 machine. In the past (on XP) I've been able to use NetLimiter for similar tasks. However for some reason I can't get it to work anymore. For lower limits the bandwidth tests are able to exceed the limit by 10-50%; higher limits seem to be ignored completely and the bandwidth tests report download speeds of over 10 times the speed I set. I'm using speedtest.net and some similar service from my ISP for these tests. Anyway, I don't necessarily need a program as complex as NetLimiter since I only need to throttle my machine's bandwidth, not a specific program's. In case you are wondering why in the world I'd want to cripple my Internet speed, there is a funny story behind this. Long story short, my modem gets random disconnects. Tech support comes in, says my Internet speed is abnormally high and I must be using some tools to somehow make it go faster than it's supposed to and this messes up my modem. I check the connection with another computer and it seems that my PC is the only one in my network that gets abnormal speeds. I reinstall my OS, speed looks normal at first, after I install the batch of 50 or so updates, it goes back to abnormally high speeds and the disconnect problems are not solved. Now I don't have a clue if the explanation the tech team gave me was just a strategy to lay the blame on someone else, but I was trying to give them the benefit of the doubt and see what happens if I really reduce my speed to their specification. Any help appreciated.

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• How can I automatically synchronize a directory tree on multiple machines?

  - by Blacklight Shining

  I have two Mac laptops and a Debian server, each with a directory that I would like to keep in sync between the three. The solution should meet the following criteria (in rough order of importance): It must not use any third-party service (e.g. Dropbox, SugarSync, Google whatever). This does not include installing additional software (as long as it's free). It must not require me to use specific directories or change my way of storing things. (Dropbox does this IIRC) It must work in all directions (changes made on /any/ machine should be pushed to the others) All data sent must be encrypted (I have ssh keypairs set up already) It must work even when not all machines are available (changes should be pushed to a machine when it comes back online) It must work even when the /directories/ on some machines are not available (they may be stored on disk images which will not always be mounted) This can be solved for Macs by using launchd to automatically launch and kill (or in some way change the behavior of) whatever daemon is used for syncing when the images are mounted and unmounted. It must be immediate (using an event-based system, not a periodic one like cron) It must be flexible (if more machines are added, I should be able to incorporate them easily) I also have some preferences that I would like to be fulfilled, but do not have to be: It should notify me somehow if there are conflicts or other errors. It should recognize symbolic and hard links and create corresponding ones. It should allow me to create a list of exceptions (subdirectories which will not be synced at all). It should not require me to set up port forwarding or otherwise reconfigure a network. This can be solved by using an ssh tunnel with reverse port forwarding. If you have a solution that meets some, but not all of the criteria, please contribute it in the comments as it might be useful in some way, and it might be possible to meet some of the criteria separately. What I tried, and why it didn't work: rsync and lsyncd do not support bidirectional synchronization csync2 is designed for server clusters and does not appear to work with machines with dynamic IPs DRBD (suggested by amotzg) involves installing a kernel module and does not appear to work on systems running OS X

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• Switch Before Firewall / Router - Multiple public IPs

  - by rii

  I currently Have a 10Mbit Full duplex circuit connected to a small unmanaged switch which then connects to a Sonicwall Firewall / Router. I have several public IP addresses (/28) that are assigned to several devices in my setup. Now the problem is the small switch I have was lent to me and needs to be returned, I have replaced this switch with several other switches but for some reason any other switch I use causes the network to become extremely slow. I believe this is a problem with the autonegotiation of theses hubs, so I am thinking of purchasing a small managed switch (cisco 300 series) and making the receiving port on the swith Explicitly 10Mbit Full Duplex and see if this works. My question is, being that this is a managed switch and needs an IP, will I still be able to run my public ips through it? Say the circuit has 70.80.4.1 - 7 will I still be able to assign 70.80.4.2 to my firewall and 70.80.4.3 to my router connected to some other port in the switch? Will I have to assign the switch a public IP address in this range as well for it to "route" to those other devices or does the switch does not care what IPs goes through it while operating as a Layer 2 Switch? Any help would be greatly appreciated. Thanks in advanced!

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• no administrator password for Windows 7

  - by huskergirl78

  I'm a secretary and my boss set up my new Windows 7 OptiPlex 7010 (Dell) computer for me while I was on vacation (he does not remember setting any "administrator" password). We are a small office so there is no system password set, either. I've used it for 6 months, all the while I couldn't access network drives, etc., without an administrator password. It was annoying, but I could still get my work done. Finally, on a slow day I took it upon myself to "fix" the problem, and in all my infinite wisdom, I managed to change my user account from administrator to standard user, so now I really can't do anything. I can't download or install any programs, move or rename files, etc. I tried the Dell suggested solution, but the BIOS tells me there is no password set, so it has to be a Windows 7 problem. All the solutions I have come across require an administrator password to let me do them. What can I do to find out the admin password so I can use my own darn computer!? Is there a default admin password?

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• C# sends SQL data 4 times less from one box than from another

  - by Bobb

  W2003, .NET 3.5, SQL 2008 I have prod and UAT app servers deployed in 2 different data centres. I have a C# app which reads text file, parse the text and sends the data to the SQL in bulk. SQL server is in US and the app servers are in London (but in different places). All POPs have dedicated network connections. There is no public internet involved. When the app runs on UAT server I can see in Perfmon that the Send byte/sec is x4 higher than from production server. My estimate is that one server outputs at 1 MB/s and the other at 250 KB/s rate. My suspicion immediately is that there is a router on one of the DCs which shapes traffic or does QoS limitation on traffice from London to US. However support and Windows team and networkig team all are saying that there are no differences in neither networking config on the 2 DCs nor NIC config on the 2 app server... How to find out why is the networking bottlneck is 4 times tighter in one place than in the other? What can I do about it?

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• A proper way to create non-interactive accounts?

  - by AndreyT

  In order to use password-protected file sharing in a basic home network I want to create a number of non-interactive user accounts on a Windows 8 Pro machine in addition to the existing set of interactive accounts. The users that corresponds to those extra accounts will not use this machine interactively, so I don't want their accounts to be available for logon and I don't want their names to appear on welcome screen. In older versions of Windows Pro (up to Windows 7) I did this by first creating the accounts as members of "Users" group, and then including them into "Deny logon locally" list in Local Security Policy settings. This always had the desired effect. However, my question is whether this is the right/best way to do it. The reason I'm asking is that even though this method works in Windows 8 Pro as well, it has one little quirk: interactive users from "User" group are still able to see these extra user names when they go to the Metro screen and hit their own user name in the top-right corner (i.e. open "Sign out/Lock" menu). The command list that drops out contains "Sign out" and "Lock" commands as well as the names of other users (for "switch user" functionality). For some reason that list includes the extra users from "Deny logon locally" list. It is interesting to note that this happens when the current user belongs to "Users" group, but it does not happen when the current user is from "Administrators". For example, let's say I have three accounts on the machine: "Administrator" (from "Administrators", can logon locally), "A" (from "Users", can logon locally), "B" (from "Users", denied logon locally). When "Administrator" is logged in, he can only see user "A" listed in his Metro "Sign out/Lock" menu, i.e. all works as it should. But when user "A" is logged in, he can see both "Administrator" and user "B" in his "Sign out/Lock" menu. Expectedly, in the above example trying to switch from user "A" to user "B" by hitting "B" in the menu does not work: Windows jumps to welcome screen that lists only "Administrator" and "A". Anyway, on the surface this appears to be an interface-level bug in Windows 8. However, I'm wondering if going through "Deny logon locally" setting is the right way to do it in Windows 8. Is there any other way to create a hidden non-interactive user account?

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• Strange problem with Google Mail and IMAP on Outlook 2007

  - by Alex C.

  I work for a small non-profit organization. We have about 35 administrative employees who use e-mail. We're on a Windows network with a domain. Everyone is running XP Pro and Office 2007 with all updates/patches. We used to use POP3 mail through a local provider. However, we recently signed-up for a free Google Apps account, and we switched to IMAP mail through Google. Everyone uses Outlook 2007 as the client. For about ten days, everything was working fine. Yesterday afternoon, we suddenly developed a strange and annoying problem. Every time you send an e-mail message, a copy of your outgoing message shows up in your inbox. It's as if you're adding your own address to the CC: line of every message. Nothing has changed on our end. I was hoping that the problem was a temporary glitch that would resolve itself, but here we are about 24 hours later, and it's still happening. I searched Twitter, and there were a handful of vague messages about issues with Google mail and IMAP, but I didn't see any references to this specific problem. Any thoughts on what's going on here and how to fix it?

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• Unable to ssh to a Linux VM after a day

  - by jogabonito

  I have a machine running 4 VMs on it. There is one Fedora VM which is causing me some trouble. The IPs of the VMs are something like 10.100.100.* I have a Windows PC which is in the same network. It has an IP 10.100.25.77. When I reboot the Fedora VM, I am able to ping it from my Windows PC as well as use putty to ssh to it. The next day, I cant ping it or ssh from my Windows PC. However I can ping and ssh to the other VMs on the machine. If I ssh to one of the other VMs, I can ping and ssh to the Fedora VM. Next if I restart it, things get back to normal and I can access it without any issues. The IP of the VM doesn't change after rebooting and it is statically assigned I would like to know what is causing this and how to get it fixed. As a last resort, I am thinking of running a cron job to restart the VM every night, it is not a critical server, but will be generally used occasionally in the day time.

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• ApplicationPoolIdentity IIS 7.5 to SQL Server 2008 R2 not working.

  - by Jack

  I have a small ASP.NET test script that opens a connection to a SQL Server database on another machine in the domain. It isn't working in all cases. Setup: IIS 7.5 under W2K8R2 trying to connect to a remote SQL Server 2008 R2 instance. All machines are in the same domain. Using the ApplicationPoolIdentity for the web site it fails to connect to the SQL Server with the following: Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'. However if I switch the Process Model Identity to NETWORK SERVICE or my domain account the database connection is successful. I've granted the \$ access in SQL Server. I am not doing any sort of authentication on the web site, it is just a simple script to open a connection to a database to make sure it works. I have Anonymous Authentication enabled and set to use the Application pool identity. How do I make this work? Why is the ApplicationPoolIdentity trying to use ANONYMOUS LOGON? Better yet, how do I make it stop using the Anonymous logon?

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• Configuration of Server root email - Change Address and Name on outgoing email

  - by JTWOOD

  As a newbie Postfix user, I've gotten so far and now I am stuck with a SMALL problem. I would like to configure my local network servers to send alerts and like using the following: 1) From address: [email protected] 2) From name: Hostname I can get #1 to work fine using smtp_generic_maps The problem is that on my email client, the name is listed as "root" - as in the header shows the following: Date: Sun, 29 Jul 2012 13:21:01 -0400 (EDT) From: [email protected] (root) To: undisclosed-recipients:; I'd like to change it to "From: [email protected] (Zeus)" I imagine that this can be done in the headers_check, but so far I haven't gotten anything to work and before I waste a ton of time trying to get this to work, I'd like to make sure I am on the right track. My aliasing and genericmaps are set up correctly (As far as I can see and know - the results are correct!). I just want to change that last bit in the From field to reflect the hostname. I would also like to add something in the subject of the outgoing messages for easy filtering - something like Subject: [Zeus.domain] - "Original Subject" Any suggestions are much appreciated. Thanks!

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• Alfa AWUSO36H 1W dysfunctional driver

  - by BrainStorm

  I recently purchased an Alfa AWUSO36H 1W wireless USB adapter for my notebook, in order to improve signal strength and quality. I'm currently using Linux Mint 11, and the it uses the RTL8187 driver for this adapter, I'm also using a 4dbi antenna, though I have others. The problem is that this adapter does exactly the opposite of what it should, actually my internal Broadcom BCM4313 adapter works way better than the alfa. Browsing is slow, some network applications don't even work, pings against Google.com on the internal adapter runs smooth, while in the alfa it gets like 25% packets lost or more! I'm less them 50 feet from my AP, the internal adapter gets 44/70 link quality, and the alfa gets around 60/70 (iwconfig output). Also the system always sets alfa power to 20dbm(100mw), then I have to do sudo iw set reg B0 to make it 30dbm(1000mw), but apparently no significant change. I've installed wireless-compat drivers, no change either. And worst of all, in Windows 7 it works way more smoothly for browsing, though I couldn't test it properly there. I hope its a driver problem, even if it's a pain to find/compile Linux drivers for a starter, I prefer it to a hardware problem where I would need to buy another adapter, since I have no money left (except for the cantenna pieces).

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• Use GRUB/GRUB2 to PXE boot OS image

  - by Jack

  Asked this in stackoverflow but they recommended I post this here: Here is the situation I am in: I currently have a Windows drive that boots XP. The BIOS does not support PXE booting so this is out of the question. Therefore, I was thinking I could install a customized GRUB bootloader on it instead such that it will have the option to PXE boot an image from a DHCP server connected to it and have the option to load Windows as it normally does (two items in menu). The catch is it may need to be automated (meaning no keyboard), so is there any way to run a script pre-boot during GRUB loading that determines if DHCP / TFTP servers are running and attempt to PXE boot an image from the network (and if not, say timeout of 10 seconds, regularly boot from Windows drive)? If this is not possible, what are some other options / suggestions? I was reading up on grub4dos as well but I'm not sure that is what I need. FWIW, I'm free to do whatever I want to the drive. I'd really appreciate some help on this as I'm not sure where to start. Thanks!

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• Trouble in Team Viewer VPN Connection

  - by Sumit Pal

  I have completed initial vpn connection setup. It has connected. I have tested with ping and it is ok. My problem is, when I want to start file transfer in VPN it asks for username & password. So what is the user name? I have tried giving Computer-Name/User-Name. I have found my Computer Name by going to Control Panel/System/ & clicking 'Computer Name' tab & username from user accounts or it is shown when I login in windows account (Please correct me if the above procedure is wrong). But what is the password? I have tried giving the account password but it always give 'The username or password is incorrect.' My Question: How to find the username & password? For Information: a) I have Team Viewer 7 installed in one Windows XP PC & one Windows 8 PC. I like to create a secure connection between these two PCs. b) The two PCs are connected in the same local network via a router. Please ask if you need additional information.

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• Snow Leopard takes a long time to connect to Windows/Samba server

  - by hood

  We run a very heterogeneous network here: There is some XP, Vista, 7, Leopard, Snow Leopard clients, and Windows 2003 (one remaining legacy app), 2008, and Linux servers. The main file server runs Ubuntu Linux and has been added to the Windows Domain and has been used for many years; SBS 2008 is the PDC (the 2003 and 2008 are on the domain also). In Leopard there were no problems at all authenticating to the file servers. We've upgraded one of the Leopard iMacs to Snow Leopard, though the same problem occurs in a new MBP which came with the newer OS as well as a clean install on another iMac. It does not matter whether connected through wired or wireless. In the Finder when clicking on the server - whether on first boot or after it is connected - it will display "Connecting..." for up to a few minutes before either generally working (if username/password in keychain) or displaying "Connection Failed" - at which time clicking "Connect As" and typing in the username/password will take some more time and eventually work. Sometimes it will display "Connecting..." indefinitely. (I've left it as long as 15 minutes before trying something else) Accessing shares on the the 2003 and SBS servers have the problem (so I don't think it's a Samba server issue). The Server 2008 Standard is connecting instantly at the moment. Accessing the share through an alias/stacks doesn't have this problem. Leopard and Windows clients still have no problem. I've searched Google but hasn't yielded any working result. How do I get rid of this delay?

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• Windows 7 can't find Ubuntu computer by hostname

  - by endolith

  I got a new Windows 7 machine, and was using VNC, SSH etc to connect to my Ubuntu machine, and it worked fine previously connecting to the Ubuntu computer's hostname. Now it doesn't work if I use the machine's hostname, but it does if I use the local IP or DynDNS name. I can also access it from my Android phone using the local hostname over SSH. If I try to connect with SSH to the hostname, it says "Host does not exist". VNC says "Failed to get server address". NX says "no address associated with name", and I don't see it in Windows' "Network" folder. I've rebooted everything. I've turned off Windows firewall. It was working fine a few days ago, but now it's not. How do I figure out what's blocking it? Aha: It probably has something to do with Samba. I reset the Samba configuration the other day, and apparently this can affect it. http://ubuntu-virginia.ubuntuforums.org/showthread.php?t=1558925 I tried commenting out "encrypt passwords = No" as described there, but it still doesn't work.

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• Capabilities of business and SOHO routers

  - by Q8Y

  I'm currently studying for the CCNA certifications (especially for Cisco routers and configuration). I know that business routers provide more features than SOHO routers, the processing speed and RAM can be enough. Assume I need to connect a number of users through a network (accessing internet, share files, printers, ...). I have a high speed connection to the internet and I already applied QoS. How can I find out how many users such a single (SOHO) router could handle? In my case I'd attach to it multiple switches until I have the number of ports needed. Would everything work well and smoothly with 50 users? What about 300? At which point would I need a business router instead? If I implemented VLAN here, would it make any difference in the performance? When do I really need to use more than one router? (Both SOHO and business) I'm thinking that I may need them only if I want to increase the performance (instead of replacing the existing one) and if I have multiple locations, so in this situation I need to have multiple routers, right? Put differently: Is there is a need to have another router if my business all in one place?

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• XP box with 3 NICs on Server 2003 Domain

  - by Hannibal

  I have assigned all three NICs IP addresses that are outside the DHCP pool. I have 2 NICs are connected to 1 switch and the 3rd to my second switch. I want to assign one of the two NICs on the 1st switch to "normal" network activity (e.g. internet access, RDP, etc.) The other two NICs I want to reserve for mirroring ports on their respective switches. While this machine is connected to the domain I can access the internet and Remote Desktop. I have no idea which NIC I am using until I start mirroring a port, at which time, if I happen to be connected through one of the NICs I have dedicated to mirroring, I lose my remote desktop. I am aware that I would have more control over the NICs using Linux. I want to explore Windows solutions before I go that route because reinstalling another OS would be inconvenient (but not impossible). I would likely use a version of Backtrack (3 or 4 not sure). I would also have to learn how to access the machine remotely but I've done it before so this would be a minor obstacle. Thank you for your assistance.

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• Want to send my neighbors to a certain website via DNS, but don't have a clue how. [closed]

  - by Akku

  My neighbors have an unsecured WIFI router, and over the administration web-UI of the router I could log in as there was no password set. I don't know which of my neighbors these are, and I'd like to configure their router in a way that they come to my website instead of Google and Facebook, where I set up a warning in german. It this page: http://www.abelssoft.de/liebenachbarn/ Basically, I just want to see if and how this is possible - I'm aware that I could just set the WiFi-password and have them call their network provider to reset the thing, but I really want to see if this could work, because it would be a way cooler effect :-). So this router interface doesn't allow custom redirects, only filters. BUT I can set the DNS that is used, so I thought there might be the possibility to set up a custom DNS on a server, set it as the main DNS and redirect from Google to the URL above. Is this possible? If so, please try to detail a way that I have to go though to achive this. Note that I'm not the super-Linux-skilled person, I have a dyndns account and a Windows machine it points to as well as an Apache+Tomcat if that helps. I could also set up virtual machines on the windows server and redirect to those using a different port. Or is there maybe a webservice that provides such custom DNS?

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• Faster, secure, protocol/code required for long-distance transfer.

  - by Chopper3

  I've ran into a problem and I'm looking for a new secure protocol/client/server that's faster over a 1Gb/s fibre link - let me tell you the story... I have a pair of redundant, diversely-routed, 1Gb/s links over a distance of around 250 miles or so (not dark fibre but a dedicated point to point link, not a mesh). At the 'client' end I have a HP DL380 G5 (2 x dual-core 2.66Ghz Xeon's, 4GB, Windows 2003EE 32-bit), at the 'server' end I have a HP BL460c G6 (2 x quad-core 2.53Ghz Xeons, 48GB, Oracle Linux 5.3 64-bit). I need to transfer around 500 x 2GB files per week from the client to the server machines per week - but the transfer NEEDS to be secure. Using both iPerf or regular FTP I can get ~80MB/s of transfer pretty consistently, which is great. Using WinSCP or Windows SFTP I can't seem to get more that ~3-4MB/s, at this point the server's CPU is 3% busy while CPU0 of the client goes to ~30% utilised. We've tried editing various TCP window sizes with little success. Both ends are connected to quite low-usage Cisco Cat6509's with Sup720's. I can replace the client machine with a newer machine and/or move it to Linux - but this will take time. Clearly these single-threaded secure Windows clients are introducing too much latency doing their encryption. So a few questions/thoughts; Are there any higher performing secure protocols or client software for Windows that I could try? I'm pretty protocol-gnostic so long as it'll work between Windows and Linux. Should I be using hardware to do the encryption, either in the client or the network parts? If so what would you recommend? I'm not convinced that just swapping the server would be that much faster, the CPU was only at 30% but then again that's higher than I'd have expected given the load - moving to Linux at the client end may be a better idea but would be quite disruptive. Am I missing a trick? Thanks in advance.

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• openvpn port 53 bypasses allows restrictions ( find similar ports)

  - by user181216

  scenario of wifi : i'm using wifi in hostel which having cyberoam firewall and all the computer which uses that access point. that access point have following configuration default gateway : 192.168.100.1 primary dns server : 192.168.100.1 here, when i try to open a website the cyberoam firewall redirects the page to a login page (with correct login information, we can browse internet else not), and also website access and bandwidth limitations. once i've heard about pd-proxy which finds open port and tunnels through a port ( usually udp 53). using pd-proxy with UDP 53 port, i can browse internet without login, even bandwidth limit is bypassed !!! and another software called openvpn with connecting openvpn server through udp port 53 i can browse internet without even login into the cyberoam. both of softwares uses port 53, specially openvpn with port 53, now i've a VPS server in which i can install openvpn server and connect through the VPS server to browse internet. i know why that is happening because with pinging on some website(eb. google.com) it returns it's ip address that means it allows dns queries without login. but the problem is there is already DNS service is running on the VPS server on port 53. and i can only use 53 port to bypass the limitations as i think. and i can not run openvpn service on my VPS server on port 53. so how to scan the wifi for vulnerable ports like 53 so that i can figure out the magic port and start a openvpn service on VPS on the same port. ( i want to scan similar vulnerable ports like 53 on cyberoam in which the traffic can be tunneled, not want to scan services running on ports). improvement of the question with retags and edits are always welcomed... NOTE : all these are for Educational purpose only, i'm curious about network related knowledge.....

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• openvpn port 53 bypasses allows restrictions ( find similar ports)

  - by user181216

  scenario of wifi : i'm using wifi in hostel which having cyberoam firewall and all the computer which uses that access point. that access point have following configuration default gateway : 192.168.100.1 primary dns server : 192.168.100.1 here, when i try to open a website the cyberoam firewall redirects the page to a login page (with correct login information, we can browse internet else not), and also website access and bandwidth limitations. once i've heard about pd-proxy which finds open port and tunnels through a port ( usually udp 53). using pd-proxy with UDP 53 port, i can browse internet without login, even bandwidth limit is bypassed !!! and another software called openvpn with connecting openvpn server through udp port 53 i can browse internet without even login into the cyberoam. both of softwares uses port 53, specially openvpn with port 53, now i've a VPS server in which i can install openvpn server and connect through the VPS server to browse internet. i know why that is happening because with pinging on some website(eb. google.com) it returns it's ip address that means it allows dns queries without login. but the problem is there is already DNS service is running on the VPS server on port 53. and i can only use 53 port to bypass the limitations as i think. and i can not run openvpn service on my VPS server on port 53. so how to scan the wifi for vulnerable ports like 53 so that i can figure out the magic port and start a openvpn service on VPS on the same port. ( i want to scan similar vulnerable ports like 53 on cyberoam in which the traffic can be tunneled, not want to scan services running on ports). improvement of the question with retags and edits are always welcomed... NOTE : all these are for Educational purpose only, i'm curious about network related knowledge.....

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• Connection failed between Windows Servers

  - by Kerby82

  I'm setting up an infrastructure based on Windows Server 2012. The firewall is turned off and I can't access the Domain controller to check for the group policy. I'm experiencing some connection problem between servers. All the servers are running a site on the TCP Port 80 and I check with netstat that the web server is binding on every Ip of the servers. If i try to telnet from the server itself on the port 80 it works (using DNS name) if I try same telnet from another machine I get connection failed. The DNS works, the ping is successfull, the servers are on the same subnet, the firewall is turned off (even though windows advanced firewall says that some settings can be managed by the System Administrator, i guess group policy). I don't know how to troubleshoot further. Do you have any idea? Is that possible that the FW looks turned off but there are some group policy blocking the connections? (I also check group policy-Administrative Template-Network Connections- Windows FW everything is not configured) I need some hint on how to keep troubleshooting such a problem.

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• Things to check for an internet-facing email server.

  - by Shtééf

  I'm faced with the task of setting up a public-internet-facing email server, that will be relaying mail for all of our other servers in the network. While the software in itself is set up in few keystrokes, what little experience I have with managing an email server has thought me that there are tons of awkward filtering techniques employed by other email systems. Systems that my own server will inevitably interact with a some point. Hence, my questions: What things should be kept in mind and double checked when setting up an email server? What resources are available for checking if my email server is set-up correctly? I'm specifically NOT looking for instructions for any given mail server, such as Exchange or Postfix. But it's okay to say: “you should have X and Y in your set-up, because when talking to server software Z, it typically tries to weed out open relays by checking for these.” Some things I've discovered myself: Make sure forward and reverse DNS are set up. Mail servers tend to do a reverse lookup for the peer IP-address when receiving. Matching a reverse look up with a follow-up forward lookup is probably employed to weed out open relays run through malware on home networks. Make sure the user in the From-address exists. The From-address is easily spoofed. A receiving mail server may try to contact the mail server in the From-domain, and see if the From-user actually exists.

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• Replace Linux Boot-Drive | ext3 to btrfs

  - by bardiir

  I've got a headless server running Debian Linux currently. Linux vault 3.2.0-3-686-pae #1 SMP Mon Jul 23 03:50:34 UTC 2012 i686 GNU/Linux The root filesystem is located on an ext3 partition on the main harddrive. My data is located on multiple harddrives that are bundled to a storage pool running with btrfs. UUID=072a7fce-bfea-46fa-923f-4fb0827ae428 / ext3 errors=remount-ro 0 1 UUID=b50965f1-a2e1-443f-876f-578b5f93cbf1 none swap sw 0 0 UUID=881e3ad9-31c4-4296-ae60-eae6c98ea45f none swap sw 0 0 UUID=30d8ae34-e2f0-44b4-bbcc-22d761a128f6 /data btrfs defaults,compress,autodefrag 0 0 What I'd like to do is to place / into the btrfs pool too. The ideal solution would provide the flexibility to boot from any disk in the system alike, so if the main drive fails I'd just need to swap another one into the main slot and it would be bootable like the main one. My main problem is, everything I do needs to result in a bootable system that is open to ssh logins via network as this server is 100% headless so there is no possibility to boot it from a live cd or anything like that. So I'd like to be extra sure everything works out fine :) How would I best go about this? Can anybody hint me to guides or whip something up for these tasks? Anything I forgot to think about? Copy root-data into btrfs pool, adjust mountpoints,... Adjust GRUB to boot from btrfs pool UUID or the local device where GRUB is installed Sync GRUB to all harddrives so every drive is equally bootable (is this even possible without destroying the btrfs partitions on the drives or would I need to disconnect the drives, install grub on them and then connect them back with a slightly smaller partition?)

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