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  • Website has become slower on a VPS, was much fast on a shared host. What's wrong?

    - by Arpit Tambi
    My shared host suspended my website stating system overload, so I moved my website to a VPS which has 4GB RAM. But for some reason the website has become very slow. This is the vmstat output - procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 1 0 0 3050500 0 0 0 0 0 1 0 0 0 0 100 0 0 Here's the Apache Benchmark output for a STATIC html page I ran on the server itself - Benchmarking www.ask-oracle.com (be patient)...apr_poll: The timeout specified has expired (70007) Total of 20 requests completed Update: Server Config: List item Centos 5.6 4 cores cpu 4 GB RAM LAMP stack with APC Wordpress Only one website It takes almost double time to load now, same website was much fast on shared hosting. I know I need to tweak some settings but have no clue where to start from? I have already tried to optimize apache, mysql etc. Update 2: CPU usage is low, see uptime output: 11:09:02 up 7 days, 21:26, 1 user, load average: 0.09, 0.11, 0.09 Update 3: When I load any webpage, browser shows "Waiting" for a long time and then page loads quickly. So I suspect server can accept only limited connections and holds extra connections in a waiting state. How to check this? Update 4: Following is the output on executing netperf TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to localhost.localdomain (127.0.0.1) port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 9615.40 [root@ip-118-139-177-244 j3ngn5ri6r01t3]# Here are the Apache MPM settings from httpd.conf, do they look okay? <IfModule worker.c> StartServers 5 MaxClients 100 MinSpareThreads 50 MaxSpareThreads 250 ThreadsPerChild 125 MaxRequestsPerChild 10000 ServerLimit 100 </IfModule>

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  • rc scripts dependencies

    - by chris
    On a Ubuntu 10.04.1 LTS server install certain services fail to start properly after a reboot. I have a couple of virtual interfaces defined on eth0: /etc/network/interfaces # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet static address 172.16.5.240 netmask 255.255.255.0 gateway 172.16.5.1 auto eth0:1 iface eth0:1 inet static address 172.16.5.241 netmask 255.255.255.0 gateway 172.16.5.1 auto eth0:2 iface eth0:2 inet static address 172.16.5.242 netmask 255.255.255.0 gateway 172.16.5.1 auto eth0:3 iface eth0:3 inet static address 172.16.5.243 netmask 255.255.255.0 gateway 172.16.5.1 and so on... The services that try to bind to for example 172.16.5.243 fail during boot, complaining that there is no such IP address. My questions: 1) Are the services started parallel by default? Can I disable that so they run sequentially? 2) Is there a way to define dependencies between rc scripts? I'm only familiar with the defining the order of seqentially started scripts using the numbers in /etc/rc[0-6].d/) Any other fix or workaround appreciated.

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  • When modern computers boot, what initial setup of RAM do they execute, and how does it exactly work?

    - by user272840
    I know the title reeks of confusion, and some of you might assume I am just wondering about how the computer boots in general, but I'm not. But I'll sort this out for you people now: 1.Onboard firmware is how mostly all modern computer devices work, whether or not with EFI/UEFI(even without "onboard firmware", older computers still employed bank switching, or similar methods with snap-in firmware, cartridges, etc.) 2.On startup there is no "programs" running in the traditional sense yet, i.e. no kernel, OS, user-applications; all of the instructions, especially the very first instruction, is specified by the Instruction Pointer, I am guessing. How is the IP/PC/etc. set to first point to an address for a BIOS/firmware/etc. instruction, and how do the BIOS instructions map themself out in memory prior to startup? 3.Aside from MMIO, BIOS uses certain RAM addresses to have instructions. The big ? comes in when I ask this ... how does BIOS do this? Conclusion: I am assuming that with the very first instruction there is an initial hardware setup for BIOS prior to complete OS bootup. What I want to know is if it's hardware engineered to always work this way, if there's another step in this bootup method I am missing, a gap of information I am unaware of, or how this all works from the very first instruction, and the RAM data itself.

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  • Is it worth hiring a hacker to perform some penetration testing on my servers ?

    - by Brann
    I'm working in a small IT company with paranoid clients, so security has always been an important consideration to us ; In the past, we've already mandated two penetration testing from independent companies specialized in this area (Dionach and GSS). We've also ran some automated penetration tests using Nessus. Those two auditors were given a lot of insider information, and found almost nothing* ... While it feels comfortable to think our system is perfectly sure (and it was surely comfortable to show those reports to our clients when they performed their due diligence work), I've got a hard time believing that we've achieved a perfectly sure system, especially considering that we have no security specialist in our company (Security has always been a concern, and we're completely paranoid, which helps, but that's far as it goes!) If hackers can hack into companies that probably employ at least a few people whose sole task is to ensure their data stays private, surely they could hack into our small business, right ? Does someone have any experience in hiring an "ethical hacker"? How to find one? How much would it cost? *The only recommendation they made us was to upgrade our remote desktop protocols on two windows servers, which they were able to access because we gave them the correct non-standard port and whitelisted their IP

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  • File uploads and client_max_body_size in nginx + gunicorn + django

    - by carlosescri
    I need to configure nginx + gunicorn to be able to upload files greater than the default max size in both servers. My nginx .conf file looks like this: server { # ... location / { proxy_pass_header Server; proxy_set_header Host $http_host; proxy_redirect off; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Scheme $scheme; proxy_connect_timeout 60; proxy_pass http://localhost:8000/; } } The idea is to allow requests of 20M for two locations: /admin/path/to/upload?param=value /installer/other/path/to/upload?param=value I've tried to add location directives at the same level than the one I've pasted here (getting 404 errors) and also tried to add them inside the location / directive (getting 413 Entity Too Large errors). My location directives look like these in their simplest form: location /admin/path/to/upload/ { client_max_body_size 20M; } location /installer/other/path/to/upload/ { client_max_body_size 20M; } But they don't work (actually I tested lots of combinations and I'm desperate thinking about this. Please, help If you can: What settings do I need to set to make this work? Thank you so much!

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  • Squid3 not caching simple request and response

    - by Nick Spacek
    Hi folks, I've pared down my squid.conf to try to figure this out: http_port 80 accel defaultsite=host.to.cache cache_peer ip.to.cache parent 80 0 no-query originserver acl our_sites dstdomain host.to.cache http_access allow our_sites refresh_pattern . 1 20% 4320 Requests are being proxied correctly, so that's a start. Here's a request: GET http://host.to.cache/path?some_param=true Accept: */* Accept-Charset: ISO-8859-1,utf-8 Accept-Encoding: gzip,deflate,sdch Accept-Language: en-US,en Connection: keep-alive Host: host.to.cache User-Agent: myuseragent And the response: Connection: keep-alive Content-Length: 585 Content-Type: application/xml Date: Thu, 06 Jan 2011 18:33:11 GMT Via: 1.0 localhost (squid/3.0.STABLE19) X-Cache: MISS from localhost X-Cache-Lookup: MISS from localhost:80 The response has no caching-related headers, but I thought that refresh_pattern would set a default behavior for responses without caching-related headers. For my test, I wanted to cache everything for one minute at minimum. Am I missing something obvious? I did take a peek at this question: Squid isn't caching ...and ran through the page here: http://www.mnot.net/cache_docs/ briefly, but didn't see anything relevant (not to say that there isn't, I could have missed something). Thanks for any help.

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  • Trouble getting latest version of Git

    - by TheMethod
    I am using Ubuntu 10.04 LTS. I'm looking at using git as source control for personal projects and Github as a remote repository. I was having trouble pushing a commit to my remote github repo getting the following error message: The requested URL returned error: 403 while accessing https://github.com/Jstall/helloworld.git/info/refs When I did some digging I found that the problem could be me not having the latest version of Git. When I did a --version I found that I have version 1.7.0.4 locally. So I tried to update git using: sudo apt-get install git but get the following error: Reading package lists... Done Building dependency tree Reading state information... Done Package git is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package git has no installation candidate I've tried running: sudo apt-get update and trying again but it didn't seem to make a difference. I'm not sure if it's relevant but I'm also getting a couple of 404's when I run update: Err http://wine.budgetdedicated.com edgy/main Packages 404 Not Found Fetched 4,117B in 0s (5,142B/s) W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/edgy/universe/binary-i386/Packages.gz 404 Not Found [IP: 91.189.91.15 80] W: Failed to fetch http://wine.budgetdedicated.com/apt/dists/edgy/main/binary-i386/Packages.gz 404 Not Found I'm not sure when I should try next. Could anyone suggest a course of action to get this resolved? Any advice would be appreciated. Thanks much!

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  • VLAN Through Switch Doesn't Work

    - by vcsjones
    I have the following scenario: I have a Cisco Aironet 1040 access point. I have it configured with two SSIDs, each going to a different VLAN. So: SSID internal : VLAN 90 SSID guest : VLAN 70 On the router side, I have a Cisco RV220W (with the radios now turned off) and have setup VLANs with like VLAN IDs. VLAN 90 : 192.168.90.0/24 VLAN 70 : 192.168.70.0/24 As far as DHCP is concerned, each VLAN has a "DHCP Server" in the router's configuration: So with the access point connected directly to the router, everything works great. I connect to the internal network, and I get a 192.168.90.x address, and the guest network gets a 70.xxx address. Next I introduced a Cisco SG200-50 PoE switch between the router and the access point. The port is configured as a trunk port, so the VLAN tags should go right through the switch back to the router. However, when something is connected to the access point, nothing works. It isn't able to get an IP address, and manually assigning one doesn't seem to let any traffic route. Given that the access point works correctly when connected to the router directly, I believe the switch is misconfigured. What am I missing here? What can I use to better diagnose what the problem might be? It's small business equipment, so CLI access is not available. Below are screenshots of the switch's config. The access point is connected to GE2.

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  • BIND returns serverfail when querying for its authoriative domain

    - by estol
    Hi there Serverfault folks! First of all: sorry about the title, I had some problem coming up with the proper title. I have a little home server set up, for internet sharing, samba, basic http, dlna mediaserver and what not, and I happend to have a domain at hand, so I thought why not direct it to this computer? I have a BIND 9.8.0 installed, and - afaik - configured it properly. For a few days, the public view did not worked, and I really did not cared, since the local view worked. But now suddenly, even the local view fails. If I try to query the nameserver for anything in my domain, it returns the following error: $ nslookup andromeda.dafaces.com ;; Got SERVFAIL reply from ::1, trying next server ;; Got SERVFAIL reply from ::1, trying next server Server: 127.0.0.1 Address: 127.0.0.1#53 ** server can't find andromeda.dafaces.com.dafaces.com: SERVFAIL Also, the public view points to the old ip address of the domain, probably because of the same error. Some information about the system: $ uname -a Linux tressis 2.6.37-ARCH #1 SMP PREEMPT Tue Mar 15 09:21:17 CET 2011 x86_64 AMD Athlon(tm) 64 X2 Dual Core Processor 5000+ AuthenticAMD GNU/Linux $ named -v BIND 9.8.0 And the named.conf file: # cat /etc/named.conf // // /etc/named.conf // include "/etc/rndc.key"; #controls { # inet 127.0.0.1 allow {localhost; } keys { "dnskulcs"; }; #}; options { directory "/var/named"; pid-file "/var/run/named/named.pid"; auth-nxdomain yes; datasize default; // Uncomment these to enable IPv6 connections support // IPv4 will still work: listen-on-v6 { any; }; listen-on { any; }; // Add this for no IPv4: // listen-on { none; }; // Default security settings. // allow-recursion { 127.0.0.1; ::1; 192.168.1.0/24; }; // allow-recursion { any; }; allow-query { any; }; allow-transfer { 127.0.0.1; ::1; 92.243.14.172; 87.98.164.164; 88.191.64.64; }; allow-update { key "dnskulcs"; }; version none; hostname none; server-id none; zone-statistics yes; forwarders { 213.46.246.53; 213.26.246.54; 8.8.8.8; 8.8.4.4; 192.188.242.65; 193.227.196.3; 2001:470:20::2; }; }; view "local" { match-clients { 192.168.1.0/24; 127.0.0.1; ::1; fec0:0:0:ffff::/64; }; recursion yes; zone "localhost" IN { type master; file "localhost.zone"; allow-transfer { any; }; }; zone "0.0.127.in-addr.arpa" IN { type master; file "127.0.0.zone"; allow-transfer { any; }; }; zone "." IN { type hint; file "root.hint"; }; zone "dafaces.com" IN { type master; file "internal/dafaces.com.fw"; allow-update { key "dnskulcs"; }; }; zone "1.168.192.in-addr.arpa" IN { type master; file "internal/dafaces.com.rev"; allow-update { key "dnskulcs"; }; }; }; view "public" { match-clients { any;}; recursion no; zone "dafaces.com" IN { type master; file "external/dafaces.com.fw"; allow-transfer { 87.98.164.164; 195.234.42.1; 88.191.64.64; }; }; }; //zone "example.org" IN { // type slave; // file "example.zone"; // masters { // 192.168.1.100; // }; // allow-query { any; }; // allow-transfer { any; }; //}; logging { channel xfer-log { file "/var/log/named.log"; print-category yes; print-severity yes; print-time yes; severity info; }; category xfer-in { xfer-log; }; category xfer-out { xfer-log; }; category notify { xfer-log; }; }; All help would be highly appreciated! EDIT: Zone files: # cat /var/named/internal/dafaces.com.fw $ORIGIN . $TTL 3600 ; 1 hour dafaces.com IN SOA tressis.dafaces.com. postmaster.dafaces.com. ( 2011032201 ; serial 28800 ; refresh (8 hours) 7200 ; retry (2 hours) 2419200 ; expire (4 weeks) 3600 ; minimum (1 hour) ) NS tressis.dafaces.com. A 192.168.1.1 MX 10 mail.dafaces.com. $ORIGIN _tcp.dafaces.com. _http SRV 0 5 80 www.dafaces.com. _ssh SRV 0 5 22 tressis.dafaces.com. $ORIGIN dafaces.com. acrisius A 192.168.1.230 andromeda A 192.168.1.7 andromeda-win7 CNAME andromeda aspasia A 192.168.1.233 athena A 192.168.1.232 callisto A 192.168.1.102 db A 192.168.1.1 management A 192.168.1.1 ; web management for the router functions haley A 192.168.1.5 hoth A 192.168.1.101 mail A 192.168.1.1 satelite A 192.168.1.20 sony-player A 192.168.1.103 TXT "310f16de2d2712dfc4ae6e5c54f60f828e" torrent A 192.168.1.1 tracker A 192.168.1.1 tressis A 192.168.1.1 www A 192.168.1.1 zeus A 192.168.1.231 and # cat /var/named/external/dafaces.com.fw $ORIGIN . $TTL 3600 dafaces.com IN SOA ns.dafaces.com. postmaster.dafaces.com. ( 2011032405; serial 28800; refresh 7200; retry 2419200; expire 3600; minimum ) NS ns.dafaces.com. NS ns0.xname.org. NS ns1.xname.org. NS ns2.xname.org. A 89.135.129.37 MX 10 mail.dafaces.com. $ORIGIN dafaces.com. ;Szolgaltatasok _ssh._tcp SRV 0 5 22 tressis _http._tcp SRV 0 5 80 www ns A 89.135.129.37 hoth A 89.135.129.37 www A 89.135.129.37 mail A 89.135.129.37 db A 89.135.129.37 torrent A 89.135.129.37 tracker A 89.135.129.37 Edit: Ohh, hell I almost forgot. Since the node is connected to the internet via a residential connection, there is a possibility, that the public ipv4 address will change(but thank god, it is a very rare case), so I daily update the external IP address in the zone file with a shellscript: # cat /etc/cron.daily/dnsupdate #!/bin/sh FILE="/var/named/external/dafaces.com.fw" SERIAL=$(date +%Y%m%d05) PUBLIC_IP=$(ifconfig internet |sed -n "/inet addr:.*255.255.255.255/{s/.*inet addr://; s/ .*//; p}") cat $FILE | sed --posix 's/^.* serial$/\t\t\t\t\t'$SERIAL'; serial/' | sed --posix 's/[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*/'$PUBLIC_IP'/' > /tmp/ujzona mv /tmp/ujzona $FILE /etc/rc.d/named reload

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  • Windows Firewall Software to Filter Transit Traffic

    - by soonts
    I need to test my networking code for Nintendo Wii under the conditions when some specific Internet server is not available. Wii is connected to my PC with crossover ethernet cable. PC has 2 NICs. PC is connected to hardware router with ethernet cable. The hardware router serves as NAT and has an internet connected to its uplink. I set the Wii to be in the same lan as PC by using Windows XP Network bridge. I can observe the WII network traffic using e.g. Wireshark sniffer. Is there a software firewall that can selectively filter out transit traffic? (e.g. block outgoing TCP connections to 123.45.67.89 to port 443) I tried Outpost Pro 2009 and Comodo. Outpost firewall blocks all transit traffic with it's implicit "block transit packet" rule. If the transit traffic is explicitly allowed by creating the system-wide low level rule, then it's allowed completely and no other filter can selectively block it. Comodo firewall only process rules when the packet has localhost's IP as either source or destination, allowing the rest of the traffic. Any ideas? Thanks in advance! P.S. Platform is Windows XP 32 bit, no other OSes is allowed, Windows ICS (Internet Connection Sharing) doesnt work since the Wii is unable to connect, becides I don't like the idea of adding one more level of NAT.

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  • Unable to Connect to just Google Servers

    - by Akshat Mittal
    I am in an extremely strange problem. I am unable to connect to just Google Servers. I am not able to access any site related to Google, Google.com | YouTube | Google+ | Webmaster Tools | jQuery CDN, nothing is working. I am able to open any other website (as I am posting this question on SuperUser), even the Google DNS (8.8.8.8 and 8.8.4.4) are offline. Please Help!! Update 1: Google DNS are back online, YouTube is back online. But website on domain google.com is not working (ex: play.google.com, maps.google.com, google.com/search, etc). Update 2: I am able to access Google.com (only) with (one of) its IP addresss(s) listed below: 74.125.227.41 74.125.227.46 74.125.227.32 74.125.227.33 74.125.227.34 74.125.227.35 74.125.227.36 74.125.227.37 74.125.227.38 74.125.227.39 74.125.227.40 Update 3: I consulted my friends nearby and they said that they are also experiencing the same problem. Seams like this is a major problem in this area (or India !!) The Problem is Now Solved!! I am able to open Google.com

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  • virtualbox instances dedicated-server with custom dnsmasq

    - by ovanes
    I have dedicated server where I planned to run virtualbox virtual machines. Since the VMs are managed with vagrant/chef I may end up with many different ones. I thought it would be a great idea to deploy a dnsmasq on the server, which is going to dynamically assign the ip addresses to the VMs. Since each Vagrant/Chef recipe is configured to set the VM's host name I can find/reference the appropriate VM by the host name. Finally, the entire infrastructure is not directly accessible via internet, so the dedicated Server is the OpenVPN host. So the entire infrastructure may be seen as: +-------------------------------------+ | Dedicated Server | | | | +-------------+ +------------+ | +------------------+ | | DNSMasq | | OpenVPN |<==========>| Client | | +-------------+ +------------+ | | | | ^ ^ | +------------------+ | | | | | +--+ | | | | +-------+ | | | | VM1 | | | | +-------+ | | | ... | | | +-------+ | | +-| VM2 | | | +-------+ | +-------------------------------------+ Now some questions which I am struggling with: Are there any other suggestions to access private infrastructure, because I don't want to reinvent the wheel. On the Dedicated Server I don't see the vboxnet0 interface but VirtualBox is installed without GUI. Accessing of virtual boxes via ssh works fine. Did I miss smth? DNSMasq must serve the local VMs only, otherwise there is a chance that local DNSMasq start to serve other server's on the network, what I don't want. Because I don't see vboxnet0 I tend to use no-dhcp-interface=eth0 config option. Are there any thoughts on that despite, the fact that a second NW-card (which is not the case), might start serving DHCP-Requests? How should I config the VM's network interface that I am able to access it via OpenVPN and resolve the hostnames using the DNSMasq. I think it should be the host-only network card. Should I do bridging in the OpenVPN config or is it sufficient to use routing.

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  • Bad Mumble control channel performance in KVM guest

    - by aef
    I'm running a Mumble server (Murmur) on a Debian Wheezy Beta 4 KVM guest which runs on a Debian Wheezy Beta 4 KVM hypervisor. The guest machines are attached to a bridge device on the hypervisor system through Virtio network interfaces. The Hypervisor is attached to a 100Mbit/s uplink and does IP-routing between the guest machines and the remaining Internet. In this setup we're experiencing a clearly recognizable lag between double-clicking a channel in the client and the channel joining action happening. This happens with a lot of different clients between 1.2.3 and 1.2.4 on Linux and Windows systems. Voice quality and latency seems to be completely unaffected by this. Most of the times the client's information dialog states a 16ms latency for both the voice and control channel. The deviation for the control channels mostly is a lot higher than the one of the voice channels. In some situations the control channel is displayed with a 100ms ping and about 1000 deviation. It seems the TCP performance is a problem here. We had no problems on an earlier setup which was in principle quite like the new one. We used Debian Lenny based Xen hypervisor and a soft-virtualised guest machine instead and an earlier version of the Mumble 1.2.3 series. The current murmurd --version says: 1.2.3-349-g315b5f5-2.1

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  • VNC from Windows to OS X Lion: App stuck in fullscreen mode

    - by Jonny
    I'm connecting to a remote Mac through a Windows. ahh it gets more complicated than that. I'm sitting by my iMac. I use Virtual Box in it to launch Windows 7. In it I have a VPN connection to a remote Windows network, which allows me to use Remote Desktop to one of the Windows (Vista!) boxes over there. From that Vista box I VNC into a Mac OS X Lion. (Don't ask me why, but that Mac doesn't have a public ip which prevents me from accessing it in the first place.) So: OSXLion - (virtual)Windows7 - Windows Vista - OSX Lion That last Mac was recently upgraded from Snow Leopard. Now with Lion, sometimes apps run in fullscreen. Somehow I can't get out of that fullscreen. Normally you'd move the mouse pointer to the top of screen and a menu list bar drops down allowing you to reach the fullscreen button top right. Now, in my current setup that menu list bar never drops down on the remote Mac at the end of the line. Any ideas?

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  • Juniper SSG 5 VPN

    - by Ethabelle
    I have a host who set up our Juniper SSG 5 VPN with Firmware version-6.2.0r5.0 I've been trying to set up VPN on it using this guide: http://kb.juniper.net/InfoCenter/index?page=content&id=KB4094 I've followed the steps and on my Mac, whenever I try to connect using L2TP over IPSec I get the following error; Summary of Steps: Create User (give them L2TP auth ability), Create Group, Place User in Group, Create VPN Gateway, Create VPN, create IP Pool, change default L2TP settings, create Untrust Trust Policy. The L2TP-VPN server did not respond. Try reconnecting. If the problem continues, verify your settings and contact your Administrator. I looked in my Firewall's logs, but I don't even see anything under Reports Logs Events. I'm.. obviously missing something, I just don't know what I'm missing at this point. I'm just starting networking and this is sort of Step 101 and I'm getting annoyed and just want to throw up OpenVPN, but I've read that has problems with Juniper Firewalls. Hooray.

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  • IPtables: DNAT not working

    - by GetFree
    In a CentOS server I have, I want to forward port 8080 to a third-party webserver. So I added this rule: iptables -t nat -A PREROUTING -p tcp --dport 8080 -j DNAT --to-destination thirdparty_server_ip:80 But it doesn't seem to work. In an effort to debug the process, I added these two LOG rules: iptables -t mangle -A PREROUTING -p tcp --src my_laptop_ip --dport ! 22 -j LOG --log-level warning --log-prefix "[_REQUEST_COMING_FROM_CLIENT_] " iptables -t nat -A POSTROUTING -p tcp --dst thirdparty_server_ip -j LOG --log-level warning --log-prefix "[_REQUEST_BEING_FORWARDED_] " (the --dport ! 22 part is there just to filter out the SSH traffic so that my log file doesn't get flooded) According to this page the mangle/PREROUTING chain is the first one to process incomming packets and the nat/POSTROUTING chain is the last one to process outgoing packets. And since the nat/PREROUTING chain comes in the middle of the other two, the three rules should do this: the rule in mangle/PREROUTING logs the incomming packets the rule in nat/PREROUTING modifies the packets (it changes the dest IP and port) the rule in nat/POSTROUTING logs the modified packets about to be forwarded Although the first rule does log incomming packets comming from my laptop, the third rule doesn't log the packets which are supposed to be modified by the second rule. It does log, however, packets that are produced in the server, hence I know the two LOG rules are working properly. Why are the packets not being forwarded, or at least why are they not being logged by the third rule? PS: there are no more rules than those three. All other chains in all tables are empty and with policy ACCEPT.

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  • Connecting to my home router web interface from work

    - by Joe
    Hi, I'm trying to connect to my home router web interface from work. I use dyndns, because I don't have a static IP at home, and it works perfectly from any other place except my workplace (update: I made a mistake, see edit below). When trying to access the web interface from work I get a "500 Server Error" with the code: SERVER_RESPONSE_RESET. I'm not trying to use any protocols such as remote desktop, I'm only trying to access the web interface. I can access any other web page from my workplace with no problems, and I think my router web interface is like any other web page, isn't it? I thought maybe my work place proxy blocks addresses of services like dyndns, so I also applied another trick. Since I have a web page on my own domain (say www.mydomain.com) which I can access from work, I tried adding a CNAME to my domain which is linked to the dyndns address (router.mydomain.com). This way if anyone enters the address router.mydomain.com from anywhere, they reach my home router web interface, and there's no way of knowing it's a dyndns address (or is there?). However, it still doesn't work from my workplace (I get the same error message). Any ides? Edit: I'm sorry to say I made a mistake earlier. I used to be able to access my home router web interface from my old workplace, and I thought it was still possible since I don't recall making any configuration changes. However, after reading the replies, I went over to my old workplace and checked, and it doesn't work from there either. I'm very sorry for giving out wrong and misleading information about my problem. So to summarize: my problem is that I can't access my home router web interface from anywhere.

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  • Can I get a domain controller not to act as DNS for the members?

    - by rsw
    Hi, Let me try to explain my current setup. I have one linux machine acting as DHCP and DNS (dhcpd3 and bind) in my network. This works fine, all computers I hook up to the network gets an IP address and proper DNS servers set. Let's call it 10.12.0.10 However, we also have a Windows Server 2003 Domain Controller in our network to which we add our Windows computers (running XP), let's call it 10.12.0.20. I noticed that when I run 'nslookup' on one of the windows machines, it says that the primary DNS is 10.12.0.20. This have not been much of a problem since: The Windows clients are stationary The Windows server in itself point out my real DHCP/DNS, since I can reach everything specified in it However, this turns out to be a problem when we use Laptops. They connect to the domain here and gets a DNS server, but when the user travels or connect the computer from home, we hit a problem. They are connected to their internet, but their DNS is 10.12.0.20 which they can't reach since they're at home and not at the office network. I solved this by removing the register key called "NameServer" with the value 10.12.0.20, but it gets set again whenever they logon to the domain the next time (when they get back to the office). Can I somehow make the computers take whatever DNS server they are handed when connecting to the internet or a home network, instead of always trying to reach the Domain Controller?

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  • AWS VPC ELB vs. Custom Load Balancing

    - by CP510
    So I'm wondering if this is a good idea. I have a Amazon AWS VPC setup with a public and private subnets. So I all ready get the Internet Gateway and NAT. I was going to setup all my web servers (Apache2 isntances) and DB servers in the private subnet and use a Load Balancer/Reverse Proxy to pick up requests and send them into the private subnets cluster of servers. My question then, is Amazons ELB's a good use for these, or is it better to setup my own custom instance to handle the public requests and run them through the NAT using nginx or pound? I like the second option just for the sake of having a instance I can log into and check. As well as taking advantage of caching and fail2ban ddos prevention, as well as possibly using fail safes to redirect traffic. But I have no experience with their ELB's, so I thought I'd ask your opinions. Also, if you guys have an opinion on this as well, would using the second option allow me to only have 1 public IP address and be able to route SSH connections through port numbers to respective instances? Thanks in advance!

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  • Windows : Map-a-network-drive to a remote Shared-Folder (on QNAP NAS) using OpenVPN

    - by spelltox
    Provided my lack of networking knowledge, I've been struggling with this issue for quite a few days now : I have a QNAP-TS212 NAS on which i've created a shared-folder (mostly excel files). All the computers in the local network (windows) are able to access it without any problem. Now, i want to access that shared-folder remotely (windows client), so : I enabled OpenVPN (and PPTP) in QNAP admin. Installed OpenVPN on the remote client. Applied the configuration file that the QNAP generated - Configuration (openvpn.ovpn) : client dev tun script-security 3 proto udp remote ***MY_WAN_IP*** 1194 resolv-retry infinite nobind ca ca.crt auth-user-pass reneg-sec 0 cipher AES-128-CBC comp-lzo OpenVPN connect successfully from the remote client. Now, here's my problem : I can ping the NAS (got IP 10.8.0.1) from the remote client, But when i try to map-a-network-drive, i don't see the shared folder or the NAS or any of the other computers in the network... I checked - all computers are in "WORKGROUP" workgroup. I'm probably missing some basic knowledge, So - any help would be greatly appreciated ! Many thanks.

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  • How do I secure Sql Server 2008 R2

    - by Mark Tait
    I have both a dedicated and a VPS (from Fasthosts) virtual server - the web sites/applications I run on these, access Sql Server stored on the same web server. Until now, I have logged onto Sql Server on both the deidicated and VPS server, from Sql Server Management Studio - until I noticed in my server application logs, multiple attempts to logon to Sql Server using the 'sa' username, but failed password. So someone/bot is trying hard (repeatedly every couple of hours, for approx 20 attempts during each instance) to log on... so obviously I have to lock down access to Sql Sever remotely. What I have done is gone into Configuration Manager, and in Sql Server Network Configuration - Protocols for Sql2008 and also in Sql Native Client 10.0 Configuration - Client Protocols - I have diabled Named Pipes, TCP/IP (and VIA by default). I have left Shared Memory enabled. I also disabled in Sql Server Services, the Sql Server Browser. Now the only way I can manage the databases on these servers, is by logging on to them via Remote Desktop. Can anyone confirm if this is the correct way of stopping anyone maliciously logging on to Sql Server? (I'm not a DBA or security expert - and there are hundreds of articles advising all different ways - but I was hoping for the experts here to confirm, or otherwise, if what I've done is correct) Thank you, Mark

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  • will heavy network traffic affect other connections on HP ProCurve V1810-48G?

    - by nn4l
    I have a HP ProCurve V1810-48G switch with a few servers connected to it (everything in one rack). The switch is practically in its default configuration. During copying of a few hundred GByte of data from server_a to server_b (using tar cf - data | ssh server_b 'cd myhome; tar xf -'), essentially saturating the network capacity between those two servers, I noticed network related error messages on the console of server_c - as if server_c is no longer able to send/receive traffic to server_d. After canceling the copy command everything was normal again. I would understand this if the network connection would use a shared resource, for example if server_a and server_c are in one datacenter, server_b and server_d are in another datacenter and both datacenters are connected with a 100 MBit line. But all of the mentioned servers are connected to the same switch and are located in the same IP network. I always thought that a connection between two servers on one switch will not affect any other server connected to the switch. It is also possible that the network related error messages are caused by something else - but I can't risk a network problem for any other system on this switch. Please advise.

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  • Router startup problems

    - by gfmoz
    I have problems with my Tilgin Vood Router. As I try to start my router by turning the power on (captain obvious), it generally doesn't work the first 3-4 times. This is getting very annoying. Five minutes after turning the power on the router's signal LEDs don't blink in the way they should do in a connected state. I can connect to my routers web configuration interface through my PC connected to it via LAN though I can't access the internet. It usually takes the router five minutes to get to the point where it should be connected to the internet but as it doesn't work the first times. So I turn on my router 3-5 times, let him work 5 minutes and then suddenly, after turning the power off and on again it all works. I also have to restart my PC too in order for everything to work. How can I solve this problem? Just leave the router turned on all time? I prefer a daily IP switch, though. May the problem have something to do with my PC? There is another one connected to the router too and it doesn't work there either.

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  • Router startup problems

    - by gfmoz
    I have problems with my Tilgin Vood Router. As I try to start my router by turning the power on (captain obvious), it generally doesn't work the first 3-4 times. This is getting very annoying. Five minutes after turning the power on the router's signal LEDs don't blink in the way they should do in a connected state. I can connect to my routers web configuration interface through my PC connected to it via LAN though I can't access the internet. It usually takes the router five minutes to get to the point where it should be connected to the internet but as it doesn't work the first times. So I turn on my router 3-5 times, let him work 5 minutes and then suddenly, after turning the power off and on again it all works. I also have to restart my PC too in order for everything to work. How can I solve this problem? Just leave the router turned on all time? I prefer a daily IP switch, though. May the problem have something to do with my PC? There is another one connected to the router too and it doesn't work there either.

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  • Nexus One WiFi connection problems.

    - by sunocky
    I have two new Nexus One for a research project. For the projects I need to keep a server running on the phone. But soon I found out that both the phones have inconsistent WiFi connection problems at my home. It can connect to my WiFi network, but will drop off in a random time. And in order to reconnect to my WiFi, I may need to reboot my router, or the phone will say "obtaining IP address" and then "Unsuccessful". I also own a G1 with firmware version 1.6, it has no such connection problems. Well, to my surprise, the two Nexus One works fine with connecting to the WiFi network at my work place, which is a WEP type WiFi connection. By the way, it is a WPA type connection at my home. Anyone knows what's the problems with the Nexus One? Any suggestions on what should I do if I want to keep the WiFi connection live all the time at my home? Thanks very much!

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