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• How to open port 25 on the server

  - by liuxingruo

  I'm using centOS. I want to implement a smtp mail server, and I have installed postfix and dovecot(both have been set correctly). I tried to telnet the 25 port, but it returns Unable to connect to remote host: Connection refused So, How can I open the 25 port? Thanks!

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• Update Windows XP to SP3 without internet

  - by Alexander

  I've been asked to update some computers running Windows XP (without any service packs) to Windows XP SP3. The computers don't have an internet connection (only a small intranet) and have never been updated since first install. Do I need to install SP1a first, then SP2, then SP3, or can I install SP3 immediately? And where do I find the right files, that don't require an internet connection during installation? All help is welcome. Thanks!

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• What is a good lightweight webradio program

  - by Robert Vukovic

  I am currently using Screamer Radio but it is a little bit buggy. It freezes a lot if internet connection is bad and can not continue if there are interruptions in the internet connection. I am not interested in some full sized MP3/media player, just a simple (with low memory footprint) application that can play streaming internet radio stations.

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• EasyVPN client Access mutiple subnet behind cisco 5510

  - by zatrac

  I need help with the following scenario Main network ASA 5510 (one inside 192.168.10.1 connection and one outside connection). This ASA 5510 connect to switch 3570 with 3 VLANS configured (192.168.10.0, 10.10.11.0, 10.10.12.0). On the remote site I have ASA5505 ( 10.10.13.0) connected to this ASA5510 through EZVPN, but all it can see is the 192.168.10.0 subnet. What do I need to do to get the subnet 10.10.13.0 to see all 3 internal subnets.

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• How to configure Java Network Proxy Settings for domain computers

  - by adminParsed

  I need to set the Network Proxy Settings to Direct Connection, for computers on our domain. I have looked at the unattended setup configurations, as well as the deployment.properties file, and didn't see an option to set it to Direct Connection. Are there any alternate means to set this? ex...logon script, vbscript, powershell, GPO, (would be great, but I couldn't find anything on this) Thanks

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• Set web browser (or other program) to use specific network

  - by Will

  my PC is connected to 3 different networks: 2 different LAN connections and a VPN connection. when i am connected to the vpn, i cannot browse to the LAN intranet as the DNS is all going through the vpn and it cannot see the domains on the LAN. Is there a way to set firefox/chrome/etc to use a specific connection, so that i don't have to disconnect from vpn to get to the other intranets?

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• Windows 7 keeps asking for WIFI credentials

  - by RubenGeert

  If I want to log onto our WIFI network, Windows keeps asking for credentials. After many connection attempts (and sometimes some reboots) we finally manage to connect. Then the connection usually stays intact for the rest of the day. But it sometimes takes 15-20 minutes before we're online... Needless to say we're using a single username/password for all failing/succeeding attempts. Does anybody recognize these symptoms? How to troubleshoot this?

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• What's the extra FTP port here?

  - by warl0ck

  While downloading a tar ball from gnu's FTP server, I found that other than standard 21 TCP port connection, I also seeing an extra connection: tcp 0 0 192.168.1.109:45056 208.118.235.20:21 ESTABLISHED 10956/wget tcp 0 0 192.168.1.109:56724 208.118.235.20:22259 ESTABLISHED 10956/wget What that port is used for? I checked /etc/services, only 20 and 21 should be in use, am I wrong? The command in use was wget 'ftp://ftp.gnu.org/gnu/tar/tar-1.26.tar.xz'

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• How to setup THIS IPv6 network

  - by Revolter

  I have a network mapped like this : just to experiment IPv6 connectivity, i want to configure my LAN network using IPv6, can some one explain me how to convert the connection between the Desktop and the Laptop to IPv6 without loosing the internet connection ? I don't want to access IPv6 internet, I need to keep my v4. So the end result will be something like an full-IPv6 Laptop accesing IPv4 internet over a some-how-configured Desktop that acting as a NAT.

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• How to set Standby server

  - by lasko

  I have an application that connects to SQL Server 2008. What I want is to make a standby server (this standby server should be a mirror of the primary one). So that when the connection fails, the primary server should automatically switch to standby server without modifying my application. If there is way, please tell me in detail or even if there is third party product. Note that I need to set the connection in my application to one server only.

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• Is it possible to print on a networked Windows Print server from an AIX server, without using remote printer queues?

  - by Stringent Software

  I have an application on an AIX server (v5.3) that needs to print via a Windows Print Server over the LAN. The simplest way to do this is to use SMIT to setup a remote print queue - which I've done on the test environment - but the IT department have refused to set up a remote print queue on the Production server. I don't have root access to the Production server. Is there any other method for connecting the app to the print server that doesn't involve print queues on the AIX box?

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• ip route add HOMEIP via SERVERIP disconnects me from ssh

  - by Arya

  I want to use a vpn connection on my Debian server but I get disconnected from ssh if I connect to the vpn. I thought by using the "ip route add" I can prevent getting disconnected from my server and it will continue to use the main connection for communication between my computer and the server, and the vpn for communication with other ips. This is the command I use ip route add PUBLICHOMEIP via PUBLICSERVERIP But I get disconnected after the "ip route add" command too. Am I making a mistake anywhere?

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• ubuntu server can`t install any package on internet

  - by user963587

  I have a Ubuntu-server. I am trying to install Vsftpd but it shows the : Reading package lists... Done Building dependency tree Reading state information... Done E: Couldn't find package vsftpd After that I checked internet connection by ping 4.2.2.4 and there was no problem in internet connection. I tried to apt-get update but it was not possible it shows: Err http://us.archive.ubuntu.com lucid Release.gpg Temporary failure resolving 'us.archive.ubuntu.com'

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• Where to get the network NIC's firmware rtl_nic/rtl8105e-1.fw?

  - by Kyrol

  Im installing Debian testing version wheezy on my Asus X53Sc with Intel Centrino Wireless-N 100. Im having a problem with my wifi connection. When I try to connect to internet with the wireless connection, an error occurs: Possible missing firmware /lib/firmware/rtl_nic/rtl8105e-1.fw for module r8169. I installed successfully the iwlwifi-100-5.ucode, but now I have this error. Any ideas or suggestions to resolve the problem ?

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• Streaming a large file

  - by Rich

  quick question say i wanted to download a file of considerable size 10gb say and i sent the GET request to a web server to download that file question is, if the client stopped reading the TCP connection, would the entire file still be downloaded, or does it depend on the client sending back an ack or something to the circuit asking for the next packet hope that makes sense This question was originally asked involving the Tor network, but i just want to know how a standard internet connection would handle this Thanks

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• OpenVPN Chaining

  - by noderunner

  I'm trying to set up an OpenVPN "chain", similar to what is described here. I have two separate networks, A and B. Each network has an OpenVPN server using a standard "road warrior" or "client/server" approach. A client can connect to either one for access to the hosts/services on that respective network. But server A and B are also connected to each other. The servers on each network have a "site-to-site" connection between the two. What I'm trying to accomplish, is the ability to connect to network A as a client, and then make connections with hosts on network B. I'm using tun/routing for all of the VPN connections. The "chain" looks something like this: [Client] --- [Server A] --- [Server A] --- [Server B] --- [Server B] --- [Host B] (tun0) (tun0) (tun1) (tun0) (eth0) (eth0) The whole idea is that server A should route traffic destined to network B through the "site-to-site" VPN set up on tun1 when a client from tun0 tries to connect. I did this simply by setting up two connection profiles on server A. One profile is a standard server config running on tun0, defining a virtual client network, IP address pool, pushing routes, etc. The other is a client connection to Server B running on tun1. With ip_forwarding enabled, I then simply added a "push route" to the clients advertising a route to network B. On server A, this seems to work when I look at tcpdump output. If I connect as a client, and then ping a host on network B, I can see the traffic getting passed from tun0 to tun1 on Server A: tcpdump -nSi tun1 icmp The weird thing is that I don't see Server B receiving that traffic through the tunnel. It's as if Server A is sending it through the site-to-site connection like it should, but server B is completely ignoring it. When I look for the traffic on Server B, it simply isn't there. A ping from Server A -- Host B works fine. But a ping from a client connected to Server A to host B does not. I'm wondering if Server B is ignoring the traffic because the source IP does not match the client IP pool that it hands out to clients? Does anyone know if I need to do something on Server B in order for it to see the traffic? This is a complicated problem to explain, so thanks if you stuck with me this far.

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• Can I read a smartcard in a virtual machine?

  - by endian

  My employer requires a smartcard to login to their web-based remote working platform. I want to access this platform by using a Remote Desktop Connection on to my Windows 7 Virtual Machine, with the smartcard plugged into my home PC. However, whilst I can see the smartcard on my home PC, it doesn't appear in the virtual machine, despite me having "Smart Cards" enabled in the Local Resources page of Remote Desktop Connection. Is it possible to get this working?

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• Architectural advice - web camera remote access

  - by Alan Hollis

  I'm looking for architectural advice. I have a client who I've built a website for which essentially allows users to view their web cameras remotely. The current flow of data is as follows: User opens page to view web camera image. Javascript script polls url on server ( appended with unique timestamp ) every 1000ms Ftp connection is enabled for the cameras ftp user. Web camera opens ftp connection to server. Web camera begins taking photos. Web camera sends photo to ftp server. On image url request: Server reads latest image on hard drive uploaded via ftp for camera. Server deleted any older images from the server. This is working okay at the moment for a small amount of users/cameras ( about 10 users and around the same amount of cameras), but we're starting to worrying about the scalability of this approach. My original plan was instead of having the files read from the server, the web server would open up an ftp connection to the web server and read the latest images directly from there meaning we should have been able to scale horizontally fairly easily. But ftp connection establishment times were too slow ( mainly due to the fact that PHP out of the ox is unable to persist ftp connections ) and so we abandoned this approach and went straight for reading from the hard drive. The firmware provider for the cameras state they're able to build a http client which instead of using ftp to upload the image could post the image to a web server. This seems plausible enough to me, but I'm looking for some architectural advice. My current thought is a simple Nginx/PHP/Redis stack. Web camera issues post requests of latest image to Nginx/PHP and the latest image for that camera is stored in Redis. The clients can then pull the latest image from Redis which should be extremely quick as the images will always be stored in memory. The data flow would then become: User opens page to view web camera image. Javascript script polls url on server ( appended with unique timestamp ) every 1000ms Camera is sent an http request to start posting images to a provided url Web camera begins taking photos. Web camera sends post requests to server as fast as it can On image url request: Server reads latest image from redis Server tells redis to delete later image My questions are: Are there any greater overheads of transferring images via HTTP instead of FTP? Is there a simple way to calculate how many potential cameras we could have streaming at once? Is there any way to prevent potentially DOS'ing our own servers due to web camera requests? Is Redis a good solution to this problem? Should I abandon PHP/Ngix combination and go for something else? Is this proposed solution actually any good? Will adding HTTPs to the mix cause posting the image to become too slow? Thanks in advance Alan

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• Ubuntu + SSL ports + AVAST

  - by jurajvt

  I have an interesting problem with communication via standard SSL ports. Fresh installed Ubuntu 14.04 server + Postfix + Dovecot, SASL authentication provided by Dovecot, self-signed certificate generated trough the Dovecot script mkcert.sh. Redirected ports on ZyWALL USG 200. I can send and receive e-mails from outside with standard ports 25 and 110, but not over 587. I am connecting to my server from machine with Windows 8.1 + VMWare Player + Ubuntu 14.04 Desktop + ssh. On Windows host I have installed Avast! antivirus. When I am trying to telnet from virtual machine to server over 587, it refused connection. But when I turn on Avast! it let me in to message Connected to... Same with nmap. When Avast! is turned on it is show me all SSL ports. When I turned it off, only standard ports appeared. OpenSSL shows me CONNECTED(00000003). But outside virtual machine directly in Windows 8.1 using nmap with zenmap there are not opened SSL ports in both Avast! states. From other external linux machines are problems with touching SSL ports same - refused. I have turned on submission in master.cf and 587 port is correctly listening on 0.0.0.0 in process master.pid which belongs to Postfix. I can telnet, or nmap over port 587 to my domain directly from server. Other ports like 995, 993 are OK on localhost, too. It is true, that I can't send emails via 587 anyway (Avast! turned on/off), but I can see ports opened. It is possible, that I have simply bad certificate and Avast! has right one, so with turned it on I can see opened ports? EDIT: To be more clear, I can't see or using port 587 everywhere from outside (tried Thunderbird, telnet, openssl, nmap, putty, swaks; both from Linux or Windows machines) and that is my problem. It was only by chance that I saw opened ports when Avast! is turned on.

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• How can I force certain applications to use specific network connections?

  - by snicker

  Let's say I have two active network connections that let me out to the internet. I want certain applications to only use Network Connection 1, while some others should use Network Connection 2. Is this possible in Windows XP? If so, how can it be done?

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• What is "Disable class based route addition" good for?

  - by JRoppert

  In the advanced TCP/IP settings of a VPN connection, i found a checkbox labeled with "Disable class based route addition". The checkbox is only enabled as long as "Use default gateway on remote network" is switched off. What is "Disable class based route addition" good for? Detailed instructions to find the settings: Open Properties of VPN connection Go to Networking tab Open Properties of "Internet Protocol Version 4 (TCP/IPv4)" (and/or TCP/IPv6) Click "Advanced..." Button Change to "IP Settings" tab Here you can find the checkboxes mentioned above

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• tracking bandwidth usage per person

  - by deepak

  We have an office of 15 people and all of us share one connection One person can hog the connection to consume all the bandwidth. which of these router firmwares would allow me to restrict access to certain mac address track bandwidth usage per mac-address or some personal identity I do not want to track the actual websites visited, only the total bandwidth usage Also want to use a router, not a dedicated computer

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• Programmatically reconnect to wifi network

  - by ya23

  Sometimes I work with frequently-dropping wifi connections. I can either reconnect manually or wait some time (varies from few seconds to few minutes) before windows attempts to reconnect. Is there a simple way to trigger reconnect immediately after the connection was dropped? Bonus question: In this particular case I'd blame hardware, but how can I diagnose the reason of dropping connection in general?

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• Naming PCs on a mixed hosts home network.

  - by Chris Becke

  I have a home network comprising an Apple iMacs and a Windows 7 PCs - using the internet connection sharing feature on the Windows 7 PC to share the internet connection with the iMac. I have configured the hostnames on each pc so, running hostname on the Windows 7 box says "windows7" and on the iMac says "apple", but, if I try and "ping apple" from Windows 7 or "ping Windows7" from the iMac they can't resolve. what do I need to do to get this 'simple' level on connectivity working?

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• After turning off my monitor, the computer won't display again

  - by Nick Lassonde

  If I physically turn off the monitor (DVI connection) and then turn it back on, the connection does not wake back up. The monitor enters "Power Saving" mode. I've tried unplugging the DVI cable and plugging back in, I've tried updating the video card drivers (it's Windows Vista; Windows 7 failed to install on this machine). I can use VNC to connect to the machine again, and after a reboot, the monitor works again. Does anyone have any idea?

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