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  • xinet vs iptables for port forwarding performance

    - by jamie.mccrindle
    I have a requirement to run a Java based web server on port 80. The options are: Web proxy (apache, nginx etc.) xinet iptables setuid The baseline would be running the app using setuid but I'd prefer not to for security reasons. Apache is too slow and nginx doesn't support keep-alives so new connections are made for every proxied request. xinet is easy to set up but creates a new process for every request which I've seen cause problems in a high performance environment. The last option is port forwarding with iptables but I have no experience of how fast it is. Of course, the ideal solution would be to do this on a dedicated hardware firewall / load balancer but that's not an option at present.

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  • optimizing file share performance on Win2k8?

    - by Kirk Marple
    We have a case where we're accessing a RAID array (drive E:) on a Windows Server 2008 SP2 x86 box. (Recently installed, nothing other than SQL Server 2005 on the server.) In one scenario, when directly accessing it (E:\folder\file.xxx) we get 45MBps throughput to a video file. If we access the same file on the same array, but through UNC path (\server\folder\file.xxx) we get about 23MBps throughput with the exact same test. Obviously the second test is going through more layers of the stack, but that's a major performance hit. What tuning should we be looking at for making the UNC path be closer in performance to the direct access case? Thanks, Kirk (corrected: it is CIFS not SMB, but generalized title to 'file share'.) (additional info: this happens during the read from a single file, not an issue across multiple connections. the file is on the local machine, but exposed via file share. so client and file server are both same Windows 2008 server.)

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  • wmic output well formed xml on remote queries

    - by Mervin
    I want to use the WMI command line tool (wmic) to get information about windows computers on the network and output it as valid xml. However, I can't seem to find the right way to do this as the outputted xml currently contains invalid tokens for which I think I should use the /TRANSLATE:basicxml switch. The command: wmic /NODE:"tech-demo" /IMPLEVEL:Impersonate /USER:MyUser /PASSWORD:MyPassword /PRIVILEGES:DISABLE /AUTHLEVEL:Pkt /AUTHORITY:"ntlmdomain:companydomain.local" PATH Win32_LogicalDisk GET * /FORMAT:rawxml This command runs but returns invalid xml tokens ('<' and '' I think? edit: it appears to fail parsing at ‹) When I add the translate switch I get the message: Can not use credentials for local connections a bit strange that it tries to query the local pc when I add the switch.. Help would be greatly appreciated.

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  • How many users are "many users"?

    - by kemp
    I need to find a solution for a website which is struggling under load. The site gets ~500 simultaneous connections during peak time, and counts around 42k hits per day. It's a wordpress based site bridged with a vbulletin forum with a lot of contents and a fairly complex structure which makes intensive use of the database. I already implemented code level full page caching (without this the server just crashes), and configured all other caching directives as well as combining css files and the like to limit http requests as much as possible. I need to understand if there is more that can be done via software or if the load is just too much for the server to handle and it needs to be upgraded, because the server goes down occasionally during peak times. Can't access the server now, but it's a dedicated CentOS machine (I think 4GB ram, can't say what CPU) running apache/mysql. So back to the main question: how can I know when the users are just too many?

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  • Firewall blocks FTP PASV response

    - by harper
    0 down vote favorite I have an FTP server that supports passive server mode (using PASV command). This works fine with Windows XP. When I want to access this server from Windows Vista or Windows 7 with firewall enabled I experience a immediate connection shutdown. A reset packet is sent to the server, the socket is signaled that the server had reset the connection (what is not true). The problem disappears when the firewall is disabled. Connections to other FTP servers work correctly. The difference is that the servers response to PASV does not enclose the address field with parentheses. This is legal as documented in RFC-959 and RFC-1132. How can I configure the firewall to stop this bad behavior?

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  • postgres memory allocation tuning 2

    - by pstanton
    i've got a Ubuntu Linux system with 12Gb memory most of which (at least 10Gb) can be allocated solely to postgres. the system also has a 6 disk 15k SCSI RAID 10 setup. The process i'm trying to optimise is twofold. firstly a single threaded, single connection will do many inserts into 2-4 tables linked by foreign key. secondly many different complex queries are run against the resulting data, using group by extensively. this part especially needs to be optimised. i have four of these processes running at once in order to make use of the quad core CPU, therefore there will generally be no more than 5 concurrent connections (1 spare for admin tasks). what configuration changes to the default Postgres config would you recommend? I'm looking for the optimum values for things like work_mem, shared_buffers etc. relevant doco thanks!

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  • What services does hosts.allow NOT affect?

    - by Jed Daniels
    I know that hosts.allow and host.deny only affect things that are tcpwrappered, but what does this mean in practice? It seems that most people use hosts.allow to handle ssh and nfs blocking, but what other services are typically handled there? And what services AREN'T typically handled there? Edit: ok, I realize I did a terrible job of explaining what I was after. No, I'm not interested in knowing if a particular service can be handled by hosts.allow, I want to know if a service will be handled. For example, if I do an lsof -i, I get a nice list of things that are listening for connections to my box. I want to know which ones will be affected if I go stick an entry into hosts.allow (well, I really want to know which ones won't be affected).

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  • How to setup heartbeat for IP fail over on SSH failure

    - by Tony
    I wonder if anyone can help me, I am trying to setup heartbeat on a redhat 5 to failover an IP address when ssh stops responding on a server. So basically you ssh to a VIP and then get put through which ever server has the floating ip. 192.168.0.100 | | /------------------------\ | /------------------------\ | Server 01 | | | Server 02 | | eth0 - 192.168.0.1 |-----/ | eth0 - 192.168.0.2 | | eth0:0 - 192.168.0.100 | | eth0:0 - down | \------------------------/ \------------------------/ if ssh stops responding i want eth0:0 to be brought up on the second machine to allow ssh connections to carry on being served. I have tried to follow some documents I have found online so here is my current configuration: ha.cf bcast eth0 keepalive 2 warntime 10 deadtime 30 initdead 120 udpport 694 auto_failback off node vm-bal01 node vm-bal02 debugfile /var/log/ha-debug logfile /var/log/ha-log authkeys auth 1 1 sha1 sshhhsecret1234 haresources server01 192.168.0.100/24/eth0:0/192.168.0.255 Hope someone can help as this is driving me nuts...

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  • Print server does not show up on router's attached devices

    - by AshTee
    Recently I bought a new more powerful wireless N router, DLink DIR 628. So I removed all connections from the previous router (Netgear WGT624) and connected them as they should be to the DLInk router. Everything works fine except for the print server. I have Hawking print server connected to HP Laserjet 6P parallel port printer. It works well with the Netgear router. But when I connect it to the DLInk router, it does not even show up in the LAN computers list. I am not sure what is going on. There is a utility called PSAdmin that can talk to the Hawking print server if I switch to Netgear router. With that utility, I can get the assigned IP address to the print server. But when switching to DLink router, even the PSAdmin fails to find the print server. I have been trying various things for last couple of days in vein. Please help.

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  • Outlook 2003 under RHEL 5 server

    - by Kumar P
    I am using RHEL 5 server as proxy server in Local network. Under server i have few windows machines. Now i want to configure Outlook 2003 for send and receive mails in windows boxes, When i configure and test connections, It showing connection failed. In browser, internet working well. Without proxy, windows outlook - 2003 configure well in windows boxes also working well. What you think about it and How can i solve this problem ? Please give clear steps to solve.

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  • A good Linux alternative to Ubuntu for a working environment.

    - by Roozak
    Hi, Im running a decent laptop with 3GB ram and 2GHz Core Duo. I use it mainly for working which requires several SSH and SFTP connections to servers and running a VM most of the time. Nothing much more intensive than that. I like using Ubuntu 9.10 however I have the issue of Nautilus and the top/bottom menus freezing up on me constantly - dare I say it, alot more problems than when I was using Windows Vista. Im just looking for recommendations of other operating systems which would be suitable for the task. Thanks

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  • TightVNC (or any VNC) viewer windows scaling

    - by mr.b
    Hi, I am currently using TightVNC to connect to multiple remote hosts in LAN. I start 16 VNC viewers, set Scaling by: Auto (in connection options display), and then select all viewer windows and use Tile Horizontally, which covers my entire screen with VNC viewers. It all works sort of nice, except that desktop interaction is really slow when there are more then 4 VNC viewers. 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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  • How to open ports on router for better torrent performance

    - by Mehper C. Palavuzlar
    I've been using utorrent to download and upload torrents for a long time. Recently someone told me that I need to open port(s) for utorrent from my router settings for better downloading and uploading performance. Is it true? If yes, how can I do that? My utorrent version: 2.0 and the port used for incoming connections: 61829. My router: Yaksu S200 ADSL router modem and I can reach its settings via web interface. I looked at the settings but they seem a bit complicated to me. Other info you may need to know: I have dynamic IP. I'm using Win7 x64.

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  • How do I upload huge files across the internet without using P2P?

    - by Brien Malone
    I work remotely and have 44GB of media files that I need to send back to my office. There are lots of free services out there that can handle up to 2GB, but I haven't seen talk of anything larger. We both have 50mbps+ connections, so I would rather not mail physical media (though, that is an option). Bittorrent is blocked at my corporate headquarters. We have an FTP server, but the per-user cap is 10GB. I use Citrix, but throughput is throttled to 3mbps. (44gb @ 50mbps = 4 to 5 hours... @3mbps = 5 or 6 days.) Any suggestions appreciated. Windows 7 and Windows 2003 Server are the OSes Involved I have tried JetBytes and it is blocked by our content filter

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  • How to use IIS as a trusted proxy for ActiveDirectory SSO?

    - by brofield
    I'm trying to add Active Directory single-sign-on support to an existing SOAP server. The server can be configured to accept a trusted reverse-proxy and use the X-Remote-User HTTP header for the authenticated user. I want to configure IIS to be the trusted proxy for this service, so that it handles all of the Active Directory authentication for the SOAP server. Basically IIS would have to accept HTTP connections on port X and URL Y, do all the authentication, and then proxy the connection to a different server (most likely the same X and Y). Unfortunately, I have no knowledge of IIS or AD (so I am trying my best to learn enough to build this solution) so please be gentle. I would assume that this is not an uncommon scenario, so is there some easy way to do this? Is this sort of functionality built into IIS or do I need to build some sort of IIS proxy program myself? Is there a better option for getting the authentication done and the X-Remote-User HTTP header set than requiring IIS?

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  • wi-fi connection drops periodically for a few seconds

    - by sergiom
    I've read the similar question on wireless connections dropping, but no answer seems to apply to my case I have configured the wi-fi lan of my router to broadcast sid and use WPA-PSK. Every few minutes my wi-fi connection drops for a few seconds and then restores. When I use two computers and run a ping -n 50000 on both computers, I see that the connection drops at different times but with almost the same rate. the router is a zyxel, one pc runs windws vista and uses a USB wi-fi device from Belkin: F6D4050 the other one runs windows 7 is a Dell PC with an Intel(R) WiFi Link 5100 AGN there are no other wi-fi lans around

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  • Android tethering question

    - by Solignis
    Hi there, I have a Motorola Droid 1 with Android 2.2 on it. I found something odd that I don't understand why it works. If I plug my phone into my home computer which is Windows 7 and I turn on the tethering ability, I am met with a Verizon captive portal and it tells me I need to pay for a tethering plan (which I don't have). Now the weird thing, if I plug the same phone into my Ubuntu 10.10 laptop and enable tethering it works and can get on the internet with no captive portal showing up. The only thing I could notice that was different about the connections was Windows connected to the phone with an NDIS driver and Linux connected to the phone with what I think is a raw device mapping. Would that have anything to do with it?

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  • Can't telnet to SQL Server

    - by Thiago
    Hi there, I have an SQL Server running on a computer, and I'm trying to access it from another computer in the same local network (potentially VPN, since it's located in a datacenter). The point is that I can't even telnet to the port in which SQL Server is listening. And yes, SQL Server is working, since I can telnet to it from my workstation. I think it's something in the host, since there's no hop between the two computers, but I don't know how to troubleshoot this. Basically I get a connection failed, when I try to telnet. What can cause such problem, since apparently there's no firewall and the server is accepting connections from other computers? Thanks in advance

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  • dialup connection script

    - by BParker
    I've just started working for a company who produce a specialist modem. In the test department they simulate actual use with a bunch of pc's acting as clients connecting over this modem. As such each needs to dial a set of dial-up connections. Each of these has to be created manually, and currently takes quite a while on each machine, so i was hoping to be able to automate the creation process. Back in the early days of the internet i remember getting CD's from ISP's where the dial-up connection was configured automatically, and i was wondering if anyone lknew how to do this, or if they could point me in the direction of a tutorial about it. To be clear, i don't want to automate actually dialing the connection, but i do want to run a script which creates the icons in the networking applet that allows us to dial these connection. Thanks in advance!!!

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  • Port Forwarding a Specific Port (e.g. 22)

    - by Jerry Blair
    I'm still confused about establishing an SSH connection (port 22) between two computers on different internal networks. For example: I am on my computer with internal IP address IIP-1, connected to my router RT-1. There are 10 IIPs connected to RT-1. I want to establish an SSH connection to IIP-3 which is connected to router RT-2. There are 10 IIPs connected to RT-2. At any time, there can be multiple SSH connections between IIPs on RT-1 and RT-2. Since I only have port 22 available, I don't know which SSH session is talking between which IIPs. I looked at a couple of similar questions but am still unclear on the solution. Thanks much, Jerry

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  • postfix destination concurrency

    - by Hamlet
    Hi, I have a website sending email using phpmailer - Centos, postfix, php, mysql etc Emails are getting delivered to all hosts correctly except one. Mar 30 14:38:22 server postfix/qmgr[15467]: 7237D218852D: to=, relay=none, delay=0.04, delays=0.04/0.01/0/0, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mail06.indamail.hu[91.83.45.46] while sending MAIL FROM) They told me to limit concurrent connections to 2 to their server. I did, but they still say I connect more than twice. main.cf: default_destination_concurrency_limit = 1 fallback_relay = smtp_destination_concurrency_limit = 1 initial_destination_concurrency = 1 Any ideas? Thanks, Hamlet

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  • linux log memory hogging issue

    - by helpmhost
    Hi, We have a VPS server (it's using Virtuozzo). On a few occasions now, our VPS memory was fully used up and no new connections could be made to the server on SSH, SMTP, or POP. The only thing that works is connecting to the web service. Luckily, plesk is running on the VPS and we have been able to reboot it through plesk (as well as see that the RAM is 100% used). I would like to find what process is causing this. I have a feeling it's MySQL, but don't really know. Is there some sort of logging I could implement that would help me find out what was the cause of this next time it happens? Thanks.

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  • Personal DNS server and fallback outside home

    - by Jens
    I have my own DNS server at home to access local names, and that is working fine. Then I have my laptop, now obviously my laptop leaves the home now and then, therefore it accesses different nets outside my home, and my DNS server is not accessible there... So I figured that I would just add Google as secondary DNS... But actually, when I do that, then suddenly I can't access my local stuff (at home that is, obviously), like my laptop is getting a quicker response from Google's DNS or something, because it can't find anything on the addresses I use locally. If I then remove the secondary DNS, and keeps my own, then it works fine again... So do I somehow need to seperate what DNS's to use on what nets? I already use sepperate DNS settings when I connect using my 3G modem, but when I use hotspots it seems to use the same settings regardless (at least in the train), also can it differ wired connections?... Is there another solution?

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  • PostgreSQL won't start anymore

    - by Sander Declerck
    Today, my PostgreSQL doesn't start anymore on my windows machine... I've tried to start the service in windows services and got the following error: Windows could not start the PostgreSQL Database Server 8.3 service on Local Computer. Error 1053: The service did not respond to the start or control request in a timely fashion. Then I went to the command line to manually start C:/Program Files (x86)/PostgreSQL/8.3/bin/psql.exe, and then I got this error: psql: Could not connect to server: Connection refused (0x0000274D/10061) Is the server running on host "???" and accepting TCP/IP connections on port 5432? Edit: I found this in the logs: 2011-04-22 13:13:16 CEST LOG: could not receive data from client: No connection could be made because the target machine actively refused it. 2011-04-22 13:13:16 CEST LOG: unexpected EOF on client connection

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  • Passing all traffic through Cloudflare

    - by Nick
    I am new to Linux System Administration and I am experimenting with iptables trying to learn how to really lock down a system with them. And one thing a friend of mine recommended was that there was a way to pass all incoming traffic through Cloudflare so even if attackers resolved the server ip they still couldn't (D)dos it directly. This is exactly what they said: "Simply config your servers iptables to only allow incoming connections from CloudFlares IP ranges then set it to allow only your IP/IP range to connect on port 21 (SSH)" Could someone help me on what command I'd need to run for Ubuntu to get this effect?

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