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• How to correctly set up iWARP? Preferably on loopback

  - by ajdecon

  iWARP is a protocol for doing remote direct memory access (RDMA) on top of TCP/IP, so that it can work with Ethernet and other network types as opposed to Infiniband. It works with many of the standard IB interfaces - the IB verbs, for example - so it's all pretty transparent. I'm doing some IB-verbs programming (mostly for the sake of learning about how they work better), and it'd be wonderfully convenient for me if I could use iWARP to do RDMA over my loopback interface, so that I could test some of my code without getting on our IB-connected cluster. :-) But I cannot figure out how to get a "local development environment" set up: there are no tutorials I'm aware of for even setting up iWARP from scratch on a server or a network interface. Can anyone give me a tutorial or point me in the right direction? Environment is Fedora 16 running in VirtualBox.

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• Testing UDP port connectivity

  - by Lock

  I am trying to test whether I can get to a particular port on a remote server (both of which I have access to) through UDP. Both servers are internet facing. I am using netcat to have a certain port listening. I then use nmap to check for that port to see if it is open, but it doesn't appear to be. Iptables is turned off. Any suggestions why this could be? I am eventually going to setup a VPN tunnel, but because I'm very new to tunnels, I want to make sure I have connectivity on port UDP 1194 before advancing.

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• MSTSC Not working, disconnects shortly after connecting

  - by F4r-20

  I'm currently having a problem connecting remotely to a server. It is a brand new build Windows 2008 R2, remote users are enabled. I'm trying to connect from a Windows 7 machine. Everytime I remotely connect to the server it will stay connected for a matter of seconds (maybe 3-5) and then disconnect and I get the standard old cannot connect and list of reasons it could be. Then I cannot connect again and get this prompt until I restart the server. As soon as it's finished restarting, it happens all over again. The network and hardware configuration between the two machines is completely reliable. Does anybody know what else I could try? Thanks.

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• Technology to Prevent Multiple logins to the Same Computer

  - by Ngu Soon Hui

  OK, this is a similar question to this. Actually I am trying to prevent people from multiple login into one single computer and use my application simultaneously. This is because I want to stop them from buying one license, install it on a machine, and use certain remote desktop technologies to do multiple user login. I want to prevent them from violating the license agreement. Is there anyway that I can do in my application for this? Or is multiple login simultaneously is simply not possible?

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• local user cannot access vsftpd server

  - by Zloy Smiertniy

  I'm currently running a vsftpd server and I added the necessary configurations in vsftpd.conf so that local users can use clients like FileZilla to manage their homes in a server. I found out that only users in the sudoers list access without a problem only they can't download the files, but users that are not sudoers cannot even access their homes from a client but they can access by a web browser using the FTP protocol and they can only access their home directories (as intented) Im running a fedora 14 on my server and my vsftpd.conf looks like this: # Example config file /etc/vsftpd/vsftpd.conf # # The default compiled in settings are fairly paranoid. This sample file # loosens things up a bit, to make the ftp daemon more usable. # Please see vsftpd.conf.5 for all compiled in defaults. # # READ THIS: This example file is NOT an exhaustive list of vsftpd options. # Please read the vsftpd.conf.5 manual page to get a full idea of vsftpd's # capabilities. # # Allow anonymous FTP? (Beware - allowed by default if you comment this out). anonymous_enable=NO # # Uncomment this to allow local users to log in. local_enable=YES # # Uncomment this to enable any form of FTP write command. write_enable=YES # # Default umask for local users is 077. You may wish to change this to 022, # if your users expect that (022 is used by most other ftpd's) local_umask=022 # # Uncomment this to allow the anonymous FTP user to upload files. This only # has an effect if the above global write enable is activated. Also, you will # obviously need to create a directory writable by the FTP user. #anon_upload_enable=YES # # Uncomment this if you want the anonymous FTP user to be able to create # new directories. #anon_mkdir_write_enable=YES # # Activate directory messages - messages given to remote users when they # go into a certain directory. dirmessage_enable=YES # # The target log file can be vsftpd_log_file or xferlog_file. # This depends on setting xferlog_std_format parameter xferlog_enable=YES # # Make sure PORT transfer connections originate from port 20 (ftp-data). connect_from_port_20=YES # # If you want, you can arrange for uploaded anonymous files to be owned by # a different user. Note! Using "root" for uploaded files is not # recommended! #chown_uploads=YES #chown_username=whoever # # The name of log file when xferlog_enable=YES and xferlog_std_format=YES # WARNING - changing this filename affects /etc/logrotate.d/vsftpd.log #xferlog_file=/var/log/xferlog # # Switches between logging into vsftpd_log_file and xferlog_file files. # NO writes to vsftpd_log_file, YES to xferlog_file xferlog_std_format=YES # # You may change the default value for timing out an idle session. #idle_session_timeout=600 # # You may change the default value for timing out a data connection. #data_connection_timeout=120 # # It is recommended that you define on your system a unique user which the # ftp server can use as a totally isolated and unprivileged user. #nopriv_user=ftpsecure # # Enable this and the server will recognise asynchronous ABOR requests. Not # recommended for security (the code is non-trivial). Not enabling it, # however, may confuse older FTP clients. #async_abor_enable=YES # # By default the server will pretend to allow ASCII mode but in fact ignore # the request. Turn on the below options to have the server actually do ASCII # mangling on files when in ASCII mode. # Beware that on some FTP servers, ASCII support allows a denial of service # attack (DoS) via the command "SIZE /big/file" in ASCII mode. vsftpd # predicted this attack and has always been safe, reporting the size of the # raw file. # ASCII mangling is a horrible feature of the protocol. ascii_upload_enable=YES ascii_download_enable=YES # # You may fully customise the login banner string: ftpd_banner=Welcome to GAMBITA FTP service # # You may specify a file of disallowed anonymous e-mail addresses. Apparently # useful for combatting certain DoS attacks. #deny_email_enable=YES # (default follows) #banned_email_file=/etc/vsftpd/banned_emails # # You may specify an explicit list of local users to chroot() to their home # directory. If chroot_local_user is YES, then this list becomes a list of # users to NOT chroot(). chroot_local_user=YES chroot_list_enable=YES # (default follows) chroot_list_file=/etc/vsftpd/chroot_list # # You may activate the "-R" option to the builtin ls. This is disabled by # default to avoid remote users being able to cause excessive I/O on large # sites. However, some broken FTP clients such as "ncftp" and "mirror" assume # the presence of the "-R" option, so there is a strong case for enabling it. ls_recurse_enable=YES # # When "listen" directive is enabled, vsftpd runs in standalone mode and # listens on IPv4 sockets. This directive cannot be used in conjunction # with the listen_ipv6 directive. listen=YES # # This directive enables listening on IPv6 sockets. To listen on IPv4 and IPv6 # sockets, you must run two copies of vsftpd with two configuration files. # Make sure, that one of the listen options is commented !! #listen_ipv6=YES pam_service_name=vsftpd userlist_enable=YES tcp_wrappers=YES use_localtime=YES Anyone has an idea of what might be happening? Nothing concerning vsftpd is written in any log

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• How to get password prompt from scp when launched remotely via ssh

  - by Zek

  When I ssh to a remote system and execute scp, I do not get a password prompt: # ssh 192.168.1.32 "scp joe\@192.168.1.31:/etc/hosts /tmp" Permission denied, please try again. Permission denied, please try again. Permission denied (publickey,password,keyboard-interactive). If I break it up like this, it works fine: # ssh 192.168.1.32 # scp joe\@192.168.1.31:/etc/hosts /tmp [email protected]'s password: How can I make it prompt me for the password in the first example above? Note: No, I cannot use key-based authentication for this.

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• Connect ADSL modem SMC7904WBRA-N to CISCO RV082

  - by Cy.

  I have a SMC7904WBRA-N ADSL modem/router that connects to the internet with a static IP given by the provider. I've received a RV082 to create a VPN connection which is having problems to connect to the remote VPN Server. After many tries we deduced that the SMC7904WBRA-N is being problematic with the NAT and I have been suggested to put the SMC router into the appropriate DSL bridging mode so the RV082 gets direct access to internet with the static IP. Can you give me any hints on how could this be done? Which mode is that?

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• How to get the basic mail command in ubuntu 10 to work

  - by Maureen Adamson

  I am a college lecturer to whom the task of supporting the students' Linux Server has fallen. My students just need to use the mail command to communicate with me and each other. I thought mail would be there by default but it wasn't. I have tried all the advice I found on the Internet and tried to install mailutils, sendmail, mailx, exim4 and postfix. There were more but I can't remember them all now. After installing (if it works - some of them don't), when I try to send a message they all give me: /usr/sbin/sendmail: file or directory not found. I don't need anything fancy - we don't need to access remote email, just locally on our server. Incidentally the same problems are occurring on the physical server and my test virtual machine, installed at different times but both Ubuntu 10. Can anyone help me?

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• Is there a way to submit a batch of commands to a Cisco router and have them execute from the router?

  - by atroon

  I need to change the configuration of a remote (6 hours' drive) client's Cisco 871 (IOS 12.4.15T) from my location because of some new internet service at his location. To be more precise, I need to change the default route, ip address of the outside interface (Fa4) and disable the PPPoE setup there. Unfortunately, doing any of this will (obviously) break the connection to the router. I do not have an out-of-band management modem set up (I know, I know). Is there any way to enter the commands I need to have run and have them execute one after the other, from a file on flash:? I have never tried anything like that before. Essentially a DOS-style batch file is exactly what I need. Nothing like it seems to be out there except using kron to execute CLI commands, but that is specified here as only taking EXEC commands, not configuration ones. Is there hope, or do I travel?

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• Reinstall linux over ssh.

  - by DoomStone

  Hello I'm having a large problem with our development server, it have had a program called Webmin + a total idiot have been administrating the Linux sever. Witch now have resulted in the server being totally trashed, there are so many different kinds of the same program install that anything doesn’t work. And don't get me started on the users and groups :D Well at last I have been given the responsibility to administrate our development server. But I would like to start from scratch, instead of trying to find every single package and config the previous admin have **ed up. But the problem is that it is a remote hosted server with ssh access. The server is running Debian, but i am thinking of reinstalling it with ubuntu server Thanks

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• Distributed Nagios Installation

  - by kruczkowski

  I'm looking for a plug-in or product that will act as a remote probe and perform tests then send back the results to the central Nagios server. Reason for this is that I'd like to monitor internal systems and servers at customers, but don't want to allow all the traffic passing the firewalls. Ideally I'd like a soft-probe that would be installed and then perform the tests and send back the results (via SSH) to the central Nagios installation. Does anyone know of a product or plug-in that would offer such service? If not Nagios, is there any other monitoring system that does such a thing (ideally open-source)?

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• Unresponsive virtual OS

  - by confusedGeek

  Hopefully someone has a suggestion on how to resolve this. Configuration Host: Win 2003R2 w/Virtual Server 2005R2 Virtual1: Win 2003R2 w/Sql Server 2005 Virtual2: Win 2003R2 w/WSS 3.0 Situation This past weekend the power went out and took down the servers (no UPS, it's a desktop standing in as dev testing server). Since the servers went down the Virtual2 server after running WSS fairly heavily for an hour to two will become unresponsive via HTTP. If I login via virtual server's remote control I don't get anything beyond a background screen. The CPU counter on the virtual server's master status shows that it isn't doing anything. The only thing I have been able to do is to turn off Virtual2, which loses any state changes. Shutdown commands issue from the virtual server master status are ignored. After restarting Virtual2 the event logs and application logs don't indicate what caused the problem. Anyone have an idea as to how to repair the OS, or maybe what could be the problem? Thanks ahead of time.

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• TightVNC (or any VNC) client windows scaling

  - by mr.b

  Hi, I am currently using TightVNC to connect to multiple remote hosts in LAN. I start 16 VNC instances, set Scaling by: Auto (in connection options display), set Hextile encoding, and then select all windows and use Tile Horizontally, which covers my entire screen with VNC screens. It all works sort of nice, except that desktop interaction is really slow when there are more then 4 VNC clients. My question is, does VNC client (not just TightVNC, but any compatible client) support some kind of smart scaling option, so that client tells server something along the lines of: "Okay, I'm displaying your entire screen in a window size 300x225 px, so can you please start sending encoded images on that resolution?", at which point interactiveness of open connections dramatically increase, and when I decide to go full screen on some connection, client and server re-negotiate and server starts sending full resolution images again? Thanks!!

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• SSH tunnel & Rsync thru two proxy/firewalls

  - by cajwine

  Screnario: [internal_server_1]AA------AB[firewall_1]AC----+ 10.2.0.3-^ ^-10.2.0.2 | internet 10.3.0.3-v v-10.3.0.2 | [internal_server_2]BA------BB[firewall_2]BC----+ Ports AC,BC has valid internet addresses. All systems run linux and have root acces to all. Need securely rsync internal_server_1:/some/path into internal_server_2:/another/path My idea is make ssh secure tunnel between two firewalls, e.g. from firewall_1 firewall1# ssh -N -p 22 -c 3des user2@firewall_2.example.com -L xxx/10.3.0.3/xxxx and after will run rsync from internal_server_1 somewhat like: intenal1# rsync -az /some/path [email protected]:/another/path I don't know how to make a correct ssh tunnel for rsync (what ports need tunnel) and to where i will make the rsync? (remote comp address in case of ssh tunnel) Any idea or pointer to helpfull internet resource for this case? thanx.

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• Timeouts when connecting to SQL Server since installing SP1 for Windows 7

  - by Julien

  Hi, I just installed SP1 for windows 7 and I have severe performance degradation when connecting to SQL Server 2005 since then. Establishing connection takes more than 30 seconds while it's instantaneous on another computer. Firewall is disabled and I didn't make any change to the configuration. It happens both when trying to connect with a hostname and with an ip address. Everything else seems to be fine (for instance, I'm have no issue connecting to other computers with remote desktop) What can cause such a problem? Thanks in advance! Edit : uninstalling the SP1 solves the issue instantly.

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• As a small business about to overhaul infrastructure and go virtual, how can we take advantage of all the features of the QNAP TS-439 Pro II+?

  - by Sally

  Specifically, how can we benefit from these current list of features? We're very new to this and I want to be able to talk intelligently to our IT consultant. VMware Ready Citrix Ready Built-in iSCSI target service Virtual Disk Drive (via iSCSI Initiator) Remote Replication Multi-LUN per Target LUN Mapping & LUN Masking Support SPC-3 Persistent Reservation Support What other products should we compare this QNAP to? I appreciate how informative the site is, but they only seem to sell their products through a small number of channels. Is QNAP well known? TIA!

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• minimal footprint windows instance on mac to run ActiveX

  - by László

  I need to run Windows to be able to use a feature for some remote work. However, I would rather not have a full-blown 20GB (or much more) Windows 8 install for Parallels. Is there a go-to site to have a barebones Windows virtual environment on a mac? Something like Windows XP with nLite done for a mac install? (Using Parallels or something else.) I cannot run nLite on a Mac to begin with. Are there prepared ISO files or something? Thanks.

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• How realistic/easy is it to host our own web servers?

  - by morpheous

  It is increasingly looking like we will need to host our own servers, because we need modems physically attached to the server machines. I (think) we will need a T1 line to our office for starters. Dont know what else is involved other than the obvious redundancy and failover requirements. My questions are: Do we really have to do it our selves or can we find a service that allows the modems to be remote as well? If we have to host the servers ourselves, what are the steps (technical and operational) required?

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• Trouble configuring sendmail to relay mail

  - by Warren Schubert

  I am trying to configure sendmail and ufw on an ubuntu server (ServerA) so that another server (ServerB) can send mail through it. In my /etc/mail/access file I have the following line (a.b.c.d is the IP of ServerB): Connect:a.b.c.d RELAY My ufw status shows the following rule I added: 25/tcp ALLOW a.b.c.d When I telnet from ServerA I get through: telnet localhost 25 When I telnet from ServerB I don't (w.x.y.z is the IP of ServerA): telnet w.x.y.z 25 telnet: Unable to connect to remote host: Connection refused I did restart the sendmail daemon after editing the access file. What could I be missing? Something in sendmail.mc? Edit: netstat -an|grep -w 25 tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN

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• "Play on another device" function not working with Samsung Allshare

  - by Tural Teyyuboglu

  Briefly I can't get work "Play on another device" function More detailed My Samsung TV (which support network) and PC are in the same network. The problem is, I can play PC contents from TV. But when I try to control TV remotely from Allshare software (PC), it shows TV only as connected device: But not as remote player in "players" list The result Tried to turn off firewall completely, reset router, re-install software. No success. Please help. BTW. On this link they kinda explained how to do it, but I software doesn' detect the TV as player in my case: http://www.samsung.com/global/allshare/pcsw/quickguide.html

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• Has anyone experienced "Screen Painting" issues with RealVNC?

  - by cybersylum

  I've just setup remote access to a Windows XP box using RealVNC. When the user runs an app, they expierence issues with "screen painting" - the screen doesn't paint well, except for a radius around the mouse cursor. The app is displaying a calendar. I am not sure what it is written in (think it is a .NET app) Have no problems getting/staying connected. Initially it seemed to be working fine. I have looked through all of the settings as far as compression and speed. I can replicate the issue from more than 1 location. The hosting Internet connection is DSL.

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• Configure sendmail to accept connection from one other IP address

  - by Kumala

  I have a RubyOnRails application running on the same server that runs sendmail. The application sends out (no need to receive) emails via the local sendmail. Now I intend to move sendmail to a dedicated server. How do I make sendmail on that server accept connections from my application on the other server? I modified sendmail.mc from DAEMON_OPTIONS(`Family=inet, Name=MTA-v4, Port=smtp, Addr=127.0.0.1')dnl to DAEMON_OPTIONS(`Family=inet, Name=MTA-v4, Port=smtp')dnl I have also added to /etc/mail/access: Connect:198.211.117.41 RELAY then ran m4 sendmail.mc > sendmail.cf and restarted sendmail. Trying to connect from my app server with telnet on port 25 to the mail server gives me: telnet: Unable to connect to remote host: Connection refused Am I missing something?

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• High disk time on sql-server

  - by Patrik

  Hi We have a dedicated sql-server 2008 r2 enterprise edition. The setup is: D: (data files) - stored on local ssd disks (not the same disks as log files) (raid 10) E: (log files) - stored on local ssd disks (not the same disks as data files) (raid 1) F: (transaction log backup) - stored remote on a SAN Today we moved our log files to new disks (from F: to E:). From a shared volume ( F:(SAN)) to dedicated local disks (E:). What then happend was that the "disk time", "avg. transfer time" and "avg disk write queue length" increased on the volume where we have the data files (D:) (not on the volume where the log files are located). The data volume and log volume does not share disks, however they share the same controller card. "Disk idle time" is low for all volumes. One thought is ofcourse that the controller card might be overloaded. But, we need more ideas on where the problem might be.

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• mirroring linux server to external usb harddrive

  - by DuPie

  My google-fu must be sucking. i havent been able to find a good solution for the following: numerous Linux server on commodity hardware Trying to do a recovery mirror copy to external harddrives External harddrives are smaller than source harddrives, but larger than data External drives are connected via usb2 (slow) Servers range from 20GB of data to 400GB of data Servers are remote, so hands on access is a pain need to copy boot files. empty external drives currently Basicly, looking for a way to do use a ghosting solution from INSIDE a running linux server to an external harddrive, without booting a cd etc. the rsync/cpio solutions i've looked at dont work great with grub/dev/proc etc. I understand that since the system isnt offline, it wont be a "mirror" image as files change, but thats ok. Are there any free/commercial products that would work?

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• vsFTPd and iptables - how to configure them in CentOS 5.5?

  - by Vincenzo

  I've installed vsFTPd in CentOS 5.5, on TWO servers, and added this rule to their iptable-s: -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT Looks like this is not enough, since when I'm trying to upload a file from one server to another, I'm getting this result (IP address is masked): # ftp 99.99.99.99 Connected to …com (99.99.99.99). 220 (vsFTPd 2.0.5) Name (99.99.99.99:root): vinny 331 Please specify the password. Password: 230 Login successful. Remote system type is UNIX. Using binary mode to transfer files. ftp> ls 227 Entering Passive Mode (99,99,99,99,107,74) ftp: connect: No route to host I've found a few articles in the net about the second rule I have to add to iptables, but I didn't find the right syntax for it. Could you please help?

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