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  • how to type/send hex on a putty session

    - by Amit Phatarphekar
    I'm using Putty to make a serial connection to a device. I need to send a Hex string on this session. How do I do this? The Hex String is FF7E414244 This is required to break the serial device into command interface mode... From an XP machine, I can use HyperTerminal. And then on the serial connection, do a "send file", where the file has this hexstring entered using hex editing means. So this mechanism works. But now I have a windows 7 with no hyperterminal. so I'm using putty. But now how do I send the hex string? Thanks

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  • Why does my Mac address reset after reconnecting?

    - by Mr.Student
    I have ubuntu 12. I'm changing my mac address with ifconfig wlan0 hw ether xx:xx:xx:xx:xx:xx which works. However when I restart my connection my computer resets my mac to my original mac address. I'm guessing that this happens because something calls... ifconfig wlan0 down ... do something before connecting ifconfig wlan0 up ... connect to designated access point I want my mac address to however be the same no matter how many times I disconnect and reconnect, whether to another network or the same one. Also it would be nice to turn off the auto-connect feature for my network-manager with out having to edit each individual connection. Lastly I would like to know how to connect to a wifi network through the terminal and not via gui network manager ubuntu provides.

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  • Throttling apache downloads selectively

    - by Synchro
    I have a linux box running Debian Sarge (old I know) and apache 2.0.54. It serves two kinds of files - regular web pages and small images, and a lot of large podcast mp3s. The podcast downloads swamp the connection and make the rest of the site unresponsive, so I'm looking to throttle the data transfer rate (not the request rate) of just the podcasts. I've set up haproxy using this technique which does what it says it will, but solves a different problem - even only 5 simultaneous podcast downloads is enough to saturate the link. In a perfect world, haproxy would support per-connection throttling, but it doesn't. So far I've looked at mod_bw (won't compile for me, seems unsupported), mod_cband (unsupported, widely reported as problematic) and iptables using tc. The iptables approach would allow me to throttle things, but would not be at all selective, slowing down everything on the server, not just the podcasts, so would just move the bottleneck without changing overall behaviour. Ideas?

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  • Using AWS SES with Sendmail

    - by Abs
    I am trying to send mail via AWS SES uisng Sendmail. I have Sendmail version 8.14.4 installed and I followed the first section of this useful tutorial by Amazon. However, I get this: root@:/etc/mail# echo "Subject: test" | sendmail -v [email protected] [email protected]... Connecting to [127.0.0.1] via relay... [email protected]... Deferred: Connection timed out with [127.0.0.1] Can anyone help me get this working? The logs have the following: Dec 14 10:35:21 ip-10-xx-xx-181 sm-msp-queue[17910]: qBE8K1Lu016411: to=root, delay=00:21:24, xdelay=00:06:19, mailer=relay, pri=121806, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1]

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  • UFW blocking random packets on 443

    - by s2jcpete
    All, I have UFW setup to allow traffic on port 443. It works as expected, though I have a large amount of UFW Block log entries. To Action From -- ------ ---- 80 ALLOW Anywhere 443 ALLOW Anywhere 22222 ALLOW Anywhere 80 ALLOW Anywhere (v6) 443 ALLOW Anywhere (v6) 22222 ALLOW Anywhere (v6) However in my syslog file I see this: [UFW BLOCK] IN=eth0 OUT= MAC=XXX SRC=<foreignip> DST=<serverip> LEN=40 TOS=0x00 PREC=0x00 TTL=116 ID=22025 DF PROTO=TCP SPT=49622 DPT=443 WINDOW=0 RES=0x00 ACK RST URGP=0 About 30 or so seconds later pound (which I'm using for SSL decryption and port redirection) throws a connection timed out messsage. I'm assuming this is because UFW is blocking the packet. I'm at a loss as to an explination. Could the packet be malformed or something, is this normal? Edit - I have since changed the /etc/defaults/ufw and set ipv6=no, so the v6 rules are no longer in the mix. The server is still showing the block / connection timed out behavior though. The new ufw status output is: Status: active Logging: on (low) Default: deny (incoming), allow (outgoing) New profiles: skip To Action From -- ------ ---- 80 ALLOW IN Anywhere 443 ALLOW IN Anywhere 22222 ALLOW IN Anywhere

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  • How to defend agains botnet http requests

    - by Killercode
    I have a server with WHM + CPanel and 5 of my costumer got infected with zbot. This means that the domains they have are constantly receiving requests to certain destinations. I tried to use mod_security but seems that it can't filter every requests... I don't really know why? I still see in the access log the connection comming in and it's consuming a LOT of bandwidth and server load Those accounts have already been clean so all of those requests go to error 404 (the ones catched on mod_security I am dropping the connection). Is there anymore ways to defend against this requests?

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  • iis php internal server error

    - by user1633206
    I developed a website, using php/mysql running at IIS Server as CGI Server API. Suddenly it gives me error 500 after two weeks. It has lot of scripts but index.php home is working. But other script that has header redirection What's wrong with my scripts. livehttp addon of firefox says.. GET /allplans.php?lang=ar&cat=1 HTTP/1.1 Host: www.myhost.com... [edited] User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:14.0) Gecko/20100101 Firefox/14.0.1 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip, deflate Connection: keep-alive Cache-Control: max-age=0 HTTP/1.1 500 Internal Server Error Content-Type: text/html Server: Microsoft-IIS/7.5 X-Powered-By: ASP.NET Date: Mon, 03 Sep 2012 08:09:13 GMT Content-Length: 1208 Connection: Keep-Alive

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  • Ethernet 802.1x client -> WiFi AP on a Raspberry Pi?

    - by Martin Janiczek
    I have an Ethernet connection that requires 802.1x authentication (TTLS, MSCHAPv2, name+password). My goal is to connect that to something that would then act as an WiFi AP, so I can use the connection on more devices (iPhone, notebook, etc.) Would it be possible/good idea to use Raspberry Pi for this purpose? Or are there better-suited devices to do this? EDIT: found some alternatives but because of low rep can't post more than two links... OpenWRT + wpa_supplicant guide Carambola - works with OpenWRT (but probably not standalone?) Hornet-UB - works with OpenWRT Asus RT-N10+ + OpenWRT how-to

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  • Linux - Block ssh users from accessing other machines on the network

    - by Sam
    I have set up a virtual machine on my network for uni project development. I have 6 team members and I don't want them to SSH in and start sniffing my network traffic. I already have set the firewall on my W7 pcs to ignore any connection attempts from the Virtual Machine, but would like to go a step further and not allow any network access from the VM to other machines on my network. Team members will be access the VM by SSH. The only external port forwarded is to vm:22. The VM is running in VirtualBox on a bridged network connection. Running latest Debian. If someone could tell me how to do this I would be much obliged.

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  • Is it possible to use Linux to route between my office (which uses IPSec) and home network?

    - by Sam
    First of all, apologies if this seems vague - I'm not an admin of anything more than a home network. I have a Ubuntu box sitting on my network which does various odd tasks for me - svn serving, some file serving, Apache/MySQL/PHP which is all raring to go. I've started a new job and at the moment I'm using ShrewSoft VPN software to establish a VPN link to the office as I need it. I'd prefer to have something always running on my home network just for convenience. My home modem/router doesn't support holding a VPN connection open. What I would like to do is set up my Linux box to hold open a VPN connection to my office and keep it open permanently, and then all applicable traffic for the office be routed through this box. I'm not sure if this is possible, or how to configure the routing on the desktop PCs (Windows 7). Would appreciate any guides, etc that could help me out.

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  • Windows 7 default VPN - Single Click to Connect

    - by Goyuix
    The default way to connect to a VPN (standard includedd MS client) seems to be to click on the network icon in the system tray to expand it, then pick the VPN connection, and click the connect button. This brings up a dialog where you can enter your username and password. I have told the VPN connection to remember my credentials. Is there some way I can skip that dialog and just have it connect? I have tried using rasdial.exe, and I can connect as long as I pass the username and password as arguments. It doesn't seem to want to use the stored credentials for some reason, maybe I need to store them with an elevated account.

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  • Frequent and weird wifi disconnections

    - by Sidou
    How would you explain, troubleshoot (and solve) the following problem? Wifi ADSL modem router D-link 2640R installed in living room at about 1.8m height. Working fine, synchronising and getting/serving stable internet connection. First situation: -Laptop 01 in other end of the house, let's say in room01 southern to the living room, distant by about 15m. Getting stable signal of good to very good quality. No disconnection. -Laptop 02 in room02 opposite to room01 (5m West) which makes it almost at the same distance and direction from the router located 15m North. Getting stable signal of good to very good quality. No disconnection. Second situation: -Laptop 01 moved to room03 Northern to the living room (actually just 3m behind the wall where the router lies). Getting stable signal of excellent quality. No disconnection. -Laptop 02 still in room02 but now experiences frequent disconnections (actually almost impossible to get the Internet even though the signal level is still very good. Either no Internet with the wifi icon appearing connected to access point or no connection established at all which happens every 2 minutes and that means virtually no Internet at all as I can just get a timeframe of 1 minute or so to load any website or even get to the router's web based control panel. If Laptop 01 is completely shut down or its wifi adapters shut down or even still working but its wifi MAC address forbidden, then Laptop 02 has no problem at all. If Laptop 02 is moved to a nearer location to the router, in the living room for instance, then no connection problem occurs even if Laptop 01 is also connected. And also if we move back Laptop 01 to its original location (room 01), then no problem as well. I'm completely lost and don't know how to address this issue. I tried to change the Wifi channel and even tried the auto channel scan but that didn't solve it. I know that the problem is probably coming from Laptop 01 being in its new location or some sort of interference as the problem occurs only under the described condition but I have no idea how to solve it! I also scanned the neighborhood for wifi jam using InSSIDer, there are few other access points but they don't seem to affect the situation. Any ideas about the steps to follow or tools to use ?

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  • When can an FTP server close its passive connections?

    - by Don Kirkby
    Does the FTP protocol allow the server to close any of its passive connections while the client is still connected? Can it tell when the client is finished receiving and then close the connection? I'm including an FTP server in my application using the pyftpdlib Python project. I've got it to work in active and passive mode, but I'm a bit concerned about when it closes its passive connections. I've tried connecting to it with both FileZilla and the default ftp command in Ubuntu, and in both cases, I get a new passive port for every request. That is, if I sit in the root folder and type ls 10 times, I use up 10 ports. This means that I have to allocate a big block of passive ports for the FTP server to use so it won't run out. As soon as the client disconnects, the server releases all the passive connections associated with that client and those ports can be reused. However, a long-running connection could use up a lot of ports.

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  • Any way to stop VMWare workstation from dropping SSH connections?

    - by oljones
    I have VMWare workstation 8 with a few Linux guests. I have had problems maintaining an active SSH connection to my VMs when they are in bridged mode. I first read that the onboard realtek network cards were not well supported so I bought a Intel Pro/1000 GT card. This supposedly had support. But this made no difference. Connections via SSH are active for about the first 3 minutes then hang and die. I have changed the TCP Checksum offload on the Intel and Realtek NICs, but this only works some of the time and even then not for very long. The best I could do was about 20 minutes before the connection was dropped. Any ideas?

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  • Time randomly changing itself, internet randomly dying

    - by Vee
    Operating System MS Windows 8 Enterprise 64-bit CPU Intel Core i7 2700K @ 3.50GHz 45 °C Sandy Bridge 32nm Technology RAM 8,00 GB Dual-Channel DDR3 @ 800MHz (8-8-8-24) Motherboard ASRock Z77 Extreme4-M (CPUSocket) 40 °C Graphics SMXL2270HD (1920x1080@60Hz) M2094D-PZ (1680x1050@60Hz) 896MB GeForce GTX 275 (CardExpert Technology) 57 °C Hard Drives 466GB FUJITSU MAXTOR STM3500320AS (SATA) 39 °C Optical Drives ASUS DRW-2014L1T Audio High Definition Audio Device Hello everyone, I installed Windows 8 RTM a few weeks ago. It's not my first time installing it, but it's the first time having two annoying problems: 1) Randomly, the system clock changes time all by itself - to fix it I have to open the time window and sync it with the internet. 2) Randomly, internet connection stops working - to fix I have to run troubleshooting. Windows will find a problem with IP on the "Ethernet" connection and fix it. 3) In rare occasions, my PC freezes and I need to restart it (a BSOD once happened, but after that only freezes) How can I permanently solve these problems? This is what I've already tried: Reset Virus scan Stop/reset the Windows Time service Disable/re-enable Windows Time automatic internet sync Change time from BIOS Change motherboard battery

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  • pptp VPN, routing

    - by Adrian
    Details: eth0 = current internet port pptp1 = VPN connection, if I connect to my provider, he give me an IP address, which is accessible from the internet. This is what I need. I want to connect through this IP back to my PC. I want to keep my primary internet connection (eth0) on my PC for all traffic, but route traffic to VPN for specified application/or port, to access application/port from the IP, which I given from the pptp provider. Huhh? Difficult but, it is possible? If yes, how? Incoming port will be always: 33340 Outgoing port can be change, but usually it is 33330

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  • How to Access an AWS Instance with RDC when behind a Private Subnet of a VPC

    - by dalej
    We are implementing a typical Amazon VPC with Public and Private Address - with all servers running the Windows platform. The MS SQL instances will be on the private subnet with all IIS/web servers on the public subnet. We have followed the detailed instructions at Scenario 2: VPC with Public and Private Subnets and everything works properly - until the point where you want to set up a Remote Desktop Connection into the SQL server(s) on the private subnet. At this point, the instructions assume you are accessing a server on the public subnet and it is not clear what is required to RDC to a server on a private subnet. It would make sense that some sort of port redirection is necessary - perhaps accessing the EIP of the Nat instance to hit a particular SQL server? Or perhaps use an Elastic Load Balancer (even though this is really for http protocols)? But it is not obvious what additional setup is required for such a Remote Desktop Connection?

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  • Windows 2008 Server Unable to activate with other methods

    - by matt king
    I'm trying to activate windows 2008 server SP2 today since the activation trial is done. I do not have an internet connection with this server so I can not activate online, and with the other servers in this farm I've been able to run the slmgr -ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx and then it would open up the activate by phone method and we would just activate that way. I say again, I don't have an internet connection so I can not do the online activate. If I do the slui 4 it brings up the activation window but show me other ways to activate is still greyed out. I've disabled the NIC on this Hyper-V server and I still can not get the other way to activate to show up... Anyone have any ideas? This computer is one of my AD servers so.. it being in notification mode kind of sucks. Thanks.

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  • Network? or router? problem

    - by Robert H Mercer
    I have two computers networked through a Netgear WG914 router which is connected to an Ipstar satellite modem via the RG47 LAN connector. The main computer is running Windows 7 Pro 64bit and the secondary computer is running Windows 7 Home Edition 32bit. On occasion there is a loss of internet connection usually on the main computer, often followed by a loss on the secondary comuter. Not, however, always the case. Windows troubleshooter, naturally, is about as much use as a politician in government.......NONE. There appears to be no problem with the ISP bad as it is and often the connection will be remade without any help from me. The difference in the OS's is not of any relevance since I had this problem before I changed over to Windows 7. Not being a nerd when it comes to networking I wonder if anyone has any constructive suggestions.

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  • DVI-D Splitter Not Working with GeForce 8400gs

    - by jimdrang
    I have a GeForce 8400gs and it has a DVI and VGA port on the back. I was using dual monitors with one VGA and one DVI cable. I wanted both displays to be digital so I bought a DVI-D splitter and put one DVI cable in each monitor, connected them to the splitter and put the single merged connection in the back of the cards DVI connection. It will not recognize the second monitor (I'm not even sure how it determined which one was the first monitor). The tech specs state that it supports "Two dual-link DVI outputs for digital flat panel display resolutions up to 2560x1600" http://www.nvidia.com/object/geforce_8400_tech_specs.html. Do I need a different converter or is my only option for dual monitors with this card one VGA, one DVI?

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  • scp -q isn't quiet between different hosts

    - by pythonic metaphor
    So scp -q file host:file and scp -q host:file file are both quiet, i.e. don't give the progress meter. But when I run scp -q host1:file host2:file, I still get the progress meter as well as a Connection to host1 closed. message. The progress meter can be gotten rid of by redirected stdout to /dev/null (although I'd rather not have to), but the connection closed messages comes on stderr, which I definitely want to keep in case there's a real error. How can I make scp quiet? Do I have to run ssh host1 "scp -q file host2:file"?

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  • Ethernet port sleeping on PS3 running linux

    - by Doug
    My lab has a PS3 running Ubuntu Linux 9.04 Server Edition. After a period of a few hours with no use, the Ethernet connection (eth0) seems to go to sleep, causing the connection to be lost. Pinging or trying to SSH into the machine results in no response. The fix I've been using is to access the machine locally and restart it (trying to bring eth0 down then up doesn't seem to correct it). I've tried setting up an hourly cron job that runs on the PS3 and pings another machine just to create network activity, but this doesn't seem to solve the problem either. Update: The solution was to run the above cron job much more frequently: every 10 minutes works.

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  • Enable/disable wireless interface in a bat file

    - by Herms
    Is there a way to enable/disable a wireless network interface via the command line (so I can put it in a bat file)? When I'm in the office I use a wired connection, but Windows still occasionally bugs me about my wireless connection not being connected (even though I turned off the option for notifying me when there's no connectivity). I'm guessing the only way to stop it from bugging me is to disable the interface, but I'd rather not have to go into the network settings every time I need to do so. I'd like to set up a bat file or a shortcut that I can use to enable/disable the wireless (preferably a single one that toggles the current state), and then just set up a keyboard shortcut for that. I just have no idea how to do so from the command line.

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  • Packing up files on my machine, sending it to a server, and unpacking it

    - by MxyL
    I am implementing a feature in my application that sends all files in a specified folder to a server. I have the basic FTP transaction set up using Apache Commons FTPClient: it sets up a connection and transfers a file from one place to another. So I can simply loop over the directory and use this connection to transfer all the files. However, this could be better. Rather than transferring each file one by one, it makes more sense to pack it up in a compressed archive and then send the whole file at once. Saves time and bandwidth, since these are just text files so they compress nicely. So I would like to add automatic archive packing and unpacking. This is the workflow I have planned out, using zip compression: Zip all files in the folder Send the file over Unzip the files at its destination 1 and 2 are easy since the files are on the local machine, but I'm not sure how to accomplish the last step, when the files are now on a remote server. What are my options? I have control over what I can put and run on the server. Perhaps it is not necessary to do the packing/unpacking myself?

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