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• Poor TCP loopback throughput on Windows

  - by Yodan Tauber

  I measured the throughput of a locally bound TCP socket connection on my computer (Intel Q9550, 64 GB RAM, Windows XP 64 bit) using iperf. I got dissatisfying results (around 1.6 Gbit/s) each time, no matter how I tweaked the TCP settings (buffer length, window size, max segment size, no delay). I got similar results when I tried netperf. Now, I understand (from sources like these) that the average throughput of a loopback connection should be around 5 Gbit/s. What could be the reasons for such poor performance?

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• Undelivered Mail Returned to Sender

  - by Alex

  When sending to [email protected] via PHP mail() function, I receive mails. When sending emails from external machines, I receive the following (e.g., sending from [email protected]. [mail.ru is Russian gmail]): This is the mail system at host fallback2.mail.ru. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to <postmaster> If you do so, please include this problem report. You can delete your own text from the attached returned message. The mail system <[email protected]>: lost connection with mail.mydomain.com[xxx.xxx.xxx.xxx] while receiving the initial server greeting Reporting-MTA: dns; fallback2.mail.ru X-mPOP-Fallback_MX-Queue-ID: D8C19F2411F1 X-mPOP-Fallback_MX-Sender: rfc822; [email protected] Arrival-Date: Tue, 29 Oct 2013 10:09:21 +0400 (MSK) Final-Recipient: rfc822; [email protected] Original-Recipient: rfc822;[email protected] Action: failed Status: 4.4.2 Diagnostic-Code: X-mPOP-Fallback_MX; lost connection with mail.tld.com[xxx.xxx.xxx.xxx] while receiving the initial server greeting Here is my postfix main.cf: command_directory = /usr/sbin daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix myhostname = mail.mydomain.com mydomain = mydomain.com myorigin = mydomain.com inet_interfaces = all inet_protocols = all unknown_local_recipient_reject_code = 550 in_flow_delay = 1s alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases mail_name = mydomain.com daemon debug_peer_level = 2 debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5 sendmail_path = /usr/sbin/sendmail.postfix newaliases_path = /usr/bin/newaliases.postfix mailq_path = /usr/bin/mailq.postfix setgid_group = postdrop html_directory = no manpage_directory = /usr/share/man sample_directory = /usr/share/doc/postfix-2.6.6/samples readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES bounce_queue_lifetime = 4h maximal_queue_lifetime = 4h delay_warning_time = 1h strict_rfc821_envelopes = yes show_user_unknown_table_name = no allow_percent_hack = no swap_bangpath = no smtpd_delay_reject = yes smtpd_error_sleep_time = 20 smtpd_soft_error_limit = 1 smtpd_hard_error_limit = 3 smtpd_junk_command_limit = 2 mydestination = mydomain.com, localhost.localdomain, localhost smtpd_client_restrictions = permit_inet_interfaces smtpd_recipient_limit = 100 virtual_alias_domains = mydomain.com virtual_alias_maps = hash:/etc/postfix/virtual smtpd_sasl_type = dovecot smtpd_sasl_path = private/auth smtpd_sasl_auth_enable = yes smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination Why emails from external server are not being delivered? Thank you! Update In a log, the following lines appear a lot of times Oct 30 10:48:29 mydomain postfix/smtpd[16216]: connect from fallback5.mail.ru[94.100.176.59] Oct 30 10:48:29 mydomain postfix/smtpd[16216]: warning: SASL: Connect to private/auth failed: Connection refused Oct 30 10:48:29 mydomain postfix/smtpd[16216]: fatal: no SASL authentication mechanisms It appears I have to configure SASL? I would understand if I would like to send emails from postfix, but why do I need it to receive emails?

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• Issues trying to download Windows 8.1 using official downloader

  - by Aviral Singh

  I had been trying to download Windows 8.1 ISO from the last 3-4 days but a silly issue is preventing me to download it.As many posts over the internet explain,I tried to use generic keys to download(as I don't have Windows 8),but the installer always shows "We can't connect right now,please check you internet connection.".Isn't it silly?,I have a working internet connection.No matter whatever key I use it always ends at this message.I've tried every single generic key,and almost every key was accepted by the installer as valid,but then the message. Can anyone please explain why is this happening and any workarounds ?

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• Spawning HTTPD processes

  - by felix001

  Can any confirm how Apache spawns new children ? As in if I connect to a webserver (HTTP 1.0 / no keep alive) and issue a HTTP /GET I will be spawned a new HTTPD child. If then issue another HTTP /GET then a new TCP connection will be built. However will I use the same child process of would I spawn a new one ? Also if I was using HTTP 1.1 (with keep-alive) and reused the same TCP connection, would the httpd process/spawning be any different to that if I wasnt using keepalive ? Thanks,

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• Gmail/Facebook/Hotmail not opening in Firefox/IE on Windows 7 Home

  - by singlepoint

  Hi, I am unable to open Gmail/Facebook/Hotmail on Firefox/IE on Widows 7 Home. I just unboxed a brand new hp laptop with Norton Security Suite running inside. I get following error message on Firefox. Please help. The connection has timed out The server at www.google.com is taking too long to respond. * The site could be temporarily unavailable or too busy. Try again in a few moments. * If you are unable to load any pages, check your computer's network connection. * If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web

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• Losing WLAN connections but maintaining internet connections on WIndows 7 Workgroup

  - by Di

  I have 4 computers all running Windows 7 networked in a Work group through Billion 7404vgp-m wireless router. All drivers and firmware for wireless adapters and router are up to date. Windows Firewall and Defender disabled. Disconnected ipv6. Running Nod 32 anti virus software. All have own static IP address 192.XXX.X.XXX. When I Reset the router all computers have Internet and LAN access for about 1 hour and then they will lose the LAN connection but maintain Internet connection. Resetting wireless adapters or restarting computers does nothing to fix this but resetting router will. What is causing this? How do I fix it?

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• Cisco: changing VTP mode server/client to transparent

  - by J. Smith

  I have around 40 L2 switches (2960, 3560, 3500, 3750) running in VTP client mode and one L3 switch (6500) running in VTP server mode, all connected together. I would like to switch everything in VTP transparent mode without any interruption of service. I've already test on a poc version with 3 switches (Catalyst 2950, 3560 and 3750). Using serial and SSH connection, it is seems working but i'm not sure it is enough representative compare to the real network. Knowing that the VTP Pruning is enabled, I am wondering what would be the best procedure to proceed the changement. I've read that we could lost connection by keeping it enabled. Should I change the server or clients first? Is it important to change the VTP domain and VTP Pruning parameters?

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• How to connect to internet 2 or more pcs with an usb wifi adapter

  - by bhaoahd

  In one pc I have an USB Wifi adapter (Realtek RTL8187L Chipset), from there a 10 meters cable to an outdoor antenna. With that I connect to a public Access Point. Now I want to be able to connect more computers to internet using that same connection that comes from the outdoor antenna, what options do I have to do this? I do have another usb wifi adapter with a small omni antenna, and a router encore ENHWI-G/A. This router can be used as a Wifi AP, but it needs a modem that works with the RJ45 connector. Is there a way I could take internet from the outdoor antenna, and create another AP indoor using that router to "repeat" that wifi that comes from the outdoor antenna? If creating this second AP is not possible, should I use some sort of local network between computers, connect my main PC with the outdoor antenna, and share the connection through the lan? (I would really prefer to have a second AP indoor so I can connect other devices like a Palm, but I am not sure how could this be possible with this router and the usb wifi adapter)

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• VPN PPTPD with MPPE Support for Debian or Ubuntu

  - by user78395

  Having an unencrypted vpn connection from a windows client to linux is pretty easy by using pptpd. When I was looking for an solution for encrypted (per MPPE) connection, I found a lot of information about patching the kernel etc. - so it definitly works after some work. But all these information is pretty old (2005-2006). Is it the same solution nowadays? I am not asking for a complete instruction (only if it's short) - I am more asking for a link to the right solution.

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• Uploading to YouTube makes all browser tabs and devices disconnect

  - by fabsenet

  Whenever I upload a video to YouTube all other browser tabs behave like there is no connection at all. It even affects my phone and other computers on the network therefor I think it has to do with my router. When the upload is done everything works normally again. I never observed this behavior with any other upload. My router is a Fritz!Box 7390 and my uploading PC is connected through a 1000mb/s switch (wired) to the router. Uploading through another browser does not change anything. I understand that other sites become slow as the network resources are limited, but stopping altogether feels wrong. speed.io measures for my internet connection: 40.894 Kbit/s down, 2.685 Kbit/s up, 29 ms ping, 2.048 con/m connects

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• What is the 'cacert.pem' and for what to use that?

  - by user65567

  I am developing a web application on localhost with domains and sub-domains and I would like to use a HTTPS connection. On my Mac OS, in order to enable SSL, I need to set Apache correctly, so I followed some guide to accomplish part of that. Now it is time to choose a certificate in order to test HTTPS requests. I seen the cacert.pem, but I don't know how to use that and for what it is used (can you explain to me some about its usage?)... So, is it possible to use the cacert.pem (see the link) for all my domains and subdomains (maybe, as a wildcard certificate) on localhost? If so, how to do that? What certificate I have to take and use? If no, what I need to do in order to use a wildcard certificate for all my domains and subdomains on localhost? Of course those certificates must be accepted by browsers and working for HTTPS connection between my domains.

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• Windows 2003 Server Suddenly Drops Connections to everything but PING and port 80 (webserver)

  - by Urda

  Hi, I'm running a Windows 2003 Dedicated server, and the box has been rock solid for more than 2 years now. Just recently, I have had an issue where after a certain ammount of time the server will just stop accepting connections on all ports except 80, and still responds to pings. If you surf to a static HTML page on the box, you can display it. If you pull up a PHP file that has an outside database connection, it fails. RDP refuses to connect, and LogMeIn reports that "The connection was reset" The only fix at this time is to have the provider physically reboot my box to correct the issue. The event log doesn't seem to be leaving helpful messages, and I am at a lost to what is causing this error since I have not installed any new software in months on it. Any tips or help would be appreciated to tracking down this issue. I don't mind updating the question as responses come in, I just do not know where to start troubleshooting because it seems random at this time.

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• VPN Authentication Credentials (Local/Remote Identifiers) For Remote Access VPN

  - by thatidiotguy

  So I am trying to set up a remote access VPN using the free ShrewSoft vpn client: https://www.shrew.net/software I want to use a PSK as the authentication mechanism combined with XAuth so that a connection requires a valid username/pass combo. Under the authentication tab this particular VPN Client however is asking for a Local Identity and a Remote Identity. The options for Local Identity Type are: Fully Qualified Domain Name User Fully Qualified Domain Name IP Address Key Identifier The options for Remote Identity are: Any Fully Qualified Domain Name User Fully Qualified Domain Name IP Address Key Identifier My current thinking is that I can use the Fully Qualifed Domain Name provided by the remote firewall for the Remote Identity, but I do not know what it wants for local identity. Just to stress: I am not trying to set up a site to site VPN. Can anybody shed any light on what I am missing here? A screenshot can be provided if that would be helpful. The current error I am getting during the connection is: IKE Responder: Proposed IKE ID mismatch

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• IIS FTP server not working after purchase of SSL certificate

  - by Chris

  I've been connecting to my web server with active mode in FileZilla with no problems. Over the weekend, an SSL certificate was dropped into a folder that I access with FTP, and which contains files for the website. Now I am receiving a 425 error in active mode on the FTP root, so I can't really do anything but log in. In passive mode, I can connect and move around in the directory tree, but the connection seems shaky. Occasionally I'll time out, and I can't get access at all to the folder containing the SSL certificate. My question is how does the SSL certificate affect my FTP connection (if at all)? Does its presence demand the use of FTP over SSL? Note: As far as I know, the only change which occurred was the placement of the SSL certificate. Firewall settings, FTP client and server settings should all be the same as before, when everything was working.

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• Sharing VPN access between two computers on the LAN

  - by Axelle Ziegler

  I have VPN access to several machines in my office from my home machine. I'd like to be able to access those machines from another computer on my LAN, without setuping a second VPN access. Both computers are Windows 7 machines. Is there a way for my "main" computer to share its VPN access to another machine on the LAN? How would one setup this share? I don't think "simple" Internet connection sharing fits my needs because: My LAN already has its own DHCP/Router to access the Internet, and I'd like to keep it this way I can't access the Internet through my VPN connection

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• nat with iptables, re-connecting fail within about 3 minutes

  - by xpu

  i constructed a nat with iptables, as following: echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -I PREROUTING -p tcp --dport 9000 -j DNAT --to xx.xx.xx.xx iptables -t nat -I POSTROUTING -p tcp --dport 9000 -j MASQUERADE service iptables save service iptables restart the configuration worked fine, but there was a problem when i disconnected and tried to reconnect again, connection will be refused within about 2~3 minutes, after that, things go fine again. what was the problem? how do i make it to accept new connection after the old one break?

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• SQL Server 2012 LocalDB

  - by user3061846

  I´m a noobie so please be patient ! I developed an app using C# and SQL Server Express 2012 with a local database, my connection string is"Data Source=localhost ; Initial Catalog = scalnet ; Integrated Security=SSPI; Trusted_Connection=Yes"; Everything worked ok till the time I made a setup and tried to install my app in another computer. My first question is: - What version of SQL should I install is this machine? it should be as ligth as possible. - I tried to install SQL exprees 2012 but it gives me an error when I execute my app "A network related or instance specific error occurred while establishing a ..... (provider:Named Pipes Provider, error:40 - Could not open a connection to SQL server." This probably should be a problem with the server configuration but I have no ideia how to solve this... Can anyone point me to the rigth direction ? ? Thanks

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• Ubuntu 10.4 No internet

  - by Keeper780

  I have Ubuntu 10.4 dual booted with Windows Vista on a work Lenovo R61 laptop. The home and work wireless connection were working fine. I lost all internet connection at work. The IT guy clearly knew nothing about Linux. Since he 'fixed' it get nothing, no wlan signal the Network manager icon was gone, no internet. I still have the live disc and if I run from the live disc the connections are there and everything works perfectly. How do I restore the internet easily on my laptop. I have been using Linux for 3 Years but I am still a bit of a newbie, this is the first major problem I've had in three years. It's driving me nuts. Thanks

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• IPSec VPN IP addresses

  - by Randomblue

  I have an IPSec VPN on my Windows 7 machine (all using the native Windows 7 gateway). The host I am connecting to has different ISAKMP "Phase 1" and "Phase 2" IP addresses. As I understand, the Phase 1 address is that of the IPsec endpoint, to which I can connect just fine. The Phase 2 address is found in their "crypto map", and the addresses need to match. At the moment, both my Phase 1 and Phase 2 addresses are configured the same. On my side, I get the error "Error 791: The L2TP connection attempt failed because security policy for the connection was not found" How can I configure the Phase 2 IP address for my Windows 7 IPSec VPN to be different to the IPSec endpoint address?

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• How SmartDNS Works

  - by Emad

  If you travel outside the US you'll notice that most of the streaming services like Netflix, Pandora, hulu etc are blocked, usually by the service providers themselves. To get around that, people use VPN services. They basically tunnel your traffic through a US server so your requests seem like they are originating in the US. These VPN services fix this blocking problem, but make your connection slower than the normal unVPNed connection. Recently however I've come across something called SmartDNS provided by overplay.net. You pay $5 a month and you get access to their DNS servers. After you change to their DNS you get access to the blocked streaming sites, without slowing down your normal traffic like email and browsing. What I'd like to know is the technical details of how this SmartDNS works. I've done some quick research but that didn't turn up anything of substance. Anybody out there knows?

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• Windows 2012 remote access can't connect

  - by Gelo Volro

  I have installed Windows Server 2012 for about 9 months ago. Earlier I could connect to my server with an external IP perfectly, but the license for the remote desktop services has ended. First, I thought it was the reason, why I couldn't use my server as RDP-server, to which users may connect. But, than in web I read, that it's possible to use windows native features, just to remove the RDP services, which are trial and the server will work as RDP-server, but with some limitations ( for e.g. such free RDP service may accept only 1 connection and other connection will be disconnected etc ). Is it true, that it's possible? If yes, please give a piece of advice, how should I repair it. Because I don't want to use TightVNC or other stuff. Thanks!

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• Route a specific user's traffic via VPN but still allow local networking

  - by wbg

  So, I want to route certain traffic via a VPN connection and the rest via my normal Internet connection. I want to run several different programs and most of them don't support binding to a specific network interface (tun0 in my case). I've managed to send a specific user's traffic via the VPN following the answers given here: iptables - Target to route packet to specific interface? But unfortunately, when I run a server that connects to the Internet and has a web interface running on a local IP (127.0.0.1/192.168.0.*), all the Internet traffic correctly goes via tun0, but I'm unable to connect to the web interface from a local IP as a different user. When I log in as the VPN-ified user, I can access services running on local IPs, but other users/machines can't access any servers I start. Can anyone point me in the right direction?

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• Get name (address) of computer from which from which SSH login was made.

  - by amicitas

  After logging onto a linux machine via SSH, I would like to be able to retrieve the name of the computer from which the connection was made. Ideally I am looking for some command like hostname or uname but that would retrieve the name of the client instead of the host. This information must be accessible somewhere, since when I log on I get a message that contains the clinent name from the last login: Last login: Thu Mar 11 18:42:01 2010 from my.address.com The reason for wanting to do this is to be able to take different action in my .login file depending on which computer I am using for connection is from.

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• 1K incoming http post requests per second, each with a 10-50K file

  - by Blankman

  I'm trying to figure out what kind of server setup I will need to support: 1K http post requests per second each post will contain a xml file between 5-50K (average of 25 kilobytes) Even if I get a 100 Mb/s connection with my dedicated box (they usually give 10 Mb/s but you can upgrade), from my calculations that is about 12K kb/s which means about 480 25kb files per second. So this means I need around 3 servers then, each with 100 Mb/s connection. Would a single server running HAProxy be able to redirect the requests to other servers or does this mean I need to get something else that can handle more than 100 Mb/s to proxy things out to the other servers? If my math is off I'd appreciate any corrections you may have.

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• Error 800 while connecting to VPN

  - by Aamir

  I am trying to connect to my office network through VPN. It used to work fine earlier but now as soon as I hit connect, I get Error 800: Error 800: Unable to establish VPN Connection. The VPN server may be unreachable, or security parameters may not be configured properly for this connection. I am using Windows XP and I am able to ping the VPN server successfully. I have Symantec Endpoint Protection installed (if it matters). I have tried disabling it as well but nothing changes.

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