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• Multicast Prblem in Linux Red Hat server

  - by Uma Kant Verma

  I am facing a very strange behavior on my server. I am using a linux cluster.On fail over server my broadcast application halts after 5 minutes.But it is working fine on Primary server. My application process listening on port and send broadcast.It is working 5 mins after that it wait on socket for further packets but it didn't receive anything. Same process is working fine at Primary server. Plz help me.

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• PHP application failed to connect after a network plugged back in

  - by tntu

  My data-center appears to have had some issues with their network and thus my server has suffered from on an off network connectivity for about an hour. After the connection has been completely re-established my code still kept reporting the same issue over and over until I have restarted the service. The code is a simple PHP code that loops forever checking the Apple feed-back server and then sleeps for a few minutes and then it begins all over again. Now I understand the error being generated if the network is down but once it got back up why did it continue until I have restarted the code? Does PHP have something that needs to be re-initialized or something?? Messges log: Dec 20 08:57:22 server kernel: r8169: eth0: link down Dec 20 08:57:28 server kernel: r8169 0000:06:00.0: eth0: link up Dec 20 08:57:29 server kernel: r8169: eth0: link down Dec 20 08:57:33 server kernel: r8169 0000:06:00.0: eth0: link up Dec 20 08:57:33 server kernel: r8169: eth0: link down Dec 20 08:57:37 server kernel: r8169 0000:06:00.0: eth0: link up Dec 20 08:57:38 server kernel: r8169: eth0: link down Dec 20 08:57:44 server kernel: r8169 0000:06:00.0: eth0: link up Dec 20 08:57:44 server kernel: r8169: eth0: link down Dec 20 08:57:52 server kernel: r8169 0000:06:00.0: eth0: link up Dec 20 08:57:52 server kernel: r8169: eth0: link down Dec 20 09:10:58 server kernel: r8169 0000:06:00.0: eth0: link up PHP Error: PHP Warning: stream_socket_client(): php_network_getaddresses: getaddrinfo failed: Name or service not known in /home/push/feedback.php on line 36 Code Line 36: $apns = stream_socket_client('ssl://feedback.sandbox.push.apple.com:2196', $errcode, $errstr, 60, STREAM_CLIENT_CONNECT, $stream_context);

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• My new SSD is causing issues. How can I solve them?

  - by Allan

  Computer specs 1 TB harddisc 120 GB 520intel SSD 8 GB DDR3 RAM Athlon Phenom II x64 955 3. 2ghz DK DFI Lanparty FX7900 M3H3 motherboard ASUS ATI RADEON HD6970 2 GB I have bought a new SSD (Intel 520, 120 GB), and wanted to use this as my system disc. I removed the other harddisc, and installed the SSD with the newest firmware. And then Windows 7 I updated Windows 7 with no problems and then put back my old harddrive. I formatted that old harddrive just to clean up at the same time... So at this stage everything was perfect. My new SSD was set as Master 0 Primary it boots on it and I have 1 TB emptyu harddrive I can use for whatever I want. So far no errors at all Now here is the problem, I installed a few games and everytime I tried to play the computer would say Windows must restart because DCOM server process launcher service terminated, or it says Windows must now restart because the Plug and Play service terminated unexpectedly Most commonly this error is caused by a rootkit virus, well I have tried formatting my entire computer, and running every antivirus I could find, so that shouldn't be it. I've also read somewhere it might happen when there are hardware issues. That on the otherhand would make sense, as I just put in a new SSD. I don't expect you to know this error. I haven't found anyone who knew it yet. maybe you can me guide through what might have gone wrong when I placed in the SSD? What have I checked regarding the SSD? It displays the right name when the computer starts up It has the newest firmware Did a 'sfc /scannow' which told me everything was fine I don't know what to do from here. Everything seems to work great with the drive. when I start playing games my computer crashes.

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• Connecting a client to Windows Home Server across the internet

  - by Guy

  I have just added a Windows Home Server (WHS) to my home network and a few of my computers are now connected to it and, using the client software, back themselves up each evening. I want to connect a computer that's outside of my home network (in someone else's house) to do the WHS via the internet. How do I do this? (i.e. There must be a way to hack the client software and tell give it an IP/port that you can expose from the WHS.)

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• iptables: Allow only HTTP access for web browsing

  - by user1448260

  Have a linux box, want it locked down but just be able to surf internet on it. Why is this script blocking http too? #!/bin/sh # # iptables -F # #Set default policies for INPUT, FORWARD and OUTPUT chains # iptables -P INPUT DROP iptables -P FORWARD DROP iptables -P OUTPUT DROP # # Allow TCP connections on tcp port 80 # iptables -A INPUT -i eth0 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT # # Set access for localhost # iptables -A INPUT -i lo -j ACCEPT # # List rules # iptables -L -v

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• solr Security help

  - by Camran

  I have solr setup with Jetty on my Ubuntu server. On any computer now, I can type my_ip:8983/solr/ and the page will show upp to anybody. How can I disable this so that only I can access that port and the solr admin? Thanks

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• How to quickly check if two columns in Excel are equivalent in value?

  - by mindless.panda

  I am interested in taking two columns and getting a quick answer on whether they are equivalent in value or not. Let me show you what I mean: So its trivial to make another column (EQUAL) that does a simple compare for each pair of cells in the two columns. It's also trivial to use conditional formatting on one of the two, checking its value against the other. The problem is both of these methods require scanning the third column or the color of one of the columns. Often I am doing this for columns that are very, very long, and visual verification would take too long and neither do I trust my eyes. I could use a pivot table to summarize the EQUAL column and see if any FALSE entries occur. I could also enable filtering and click on the filter on EQUAL and see what entries are shown. Again, all of these methods are time consuming for what seems to be such a simple computational task. What I'm interested in finding out is if there is a single cell formula that answers the question. I attempted one above in the screenshot, but clearly it doesn't do what I expected, since A10 does not equal B10. Anyone know of one that works or some other method that accomplishes this?

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• Can't login to Debian (OpenVZ guest) server after setting up IPTables. How to Fix it?

  - by EApubs

  I have an OpenVZ VPS server with Debian. I just setup IPTables to allow the SSH port rebooted it. (Also set the rules to auto load on startup). Now I can't login to the server! How to fix this? Here are the rules : Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT tcp -- anywhere anywhere tcp dpt:325 DROP all -- anywhere anywhere Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination

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• Does a USB hub affect performance?

  - by user1018733

  I have two devices I want maximum throughput and latency with. (Midi drums and midi keyboard for example) Would connecting both to the same USB port via a hub effectively limit the maximum data transfer rate to 1/2 to each of them? I am assuming yes, but I didn't know if USB hubs had a handshaking and priority giving protocol available (e.g. let the device with the longer built up buffer of data communicate first) Thanks

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• MongoDB and GrifFS. What are the best storage options in the range of 1 TB?

  - by Nerian

  We are going to launch a service that will require between 1 and 2 GB for file storage per paid user. I am going to use GridFS for storing files. I am pondering the different options for storing the database. But since I am unexperienced at deployment and it is my first time with Mongodb I need your experience. Criteria: I want to spend my time developing my core business, that is, my own application. I am a Ruby on Rails developer. I do not like to mess with server configuration. Hence, I would like a fully managed hosting solution. But I would like to know about any other option, if you think it is worth it. It should be able to scale. Cloud style. Pay as you go. The lower the price, the better. So far I known of these services: https://mongohq.com/pricing https://mongomachine.com/pricing https://mongolab.com/about/pricing/ http://cloudcontrol.com/add-ons/mongodb/ And they seem to be OK for common needs, that is no file storage. But I am going to use GridFS, so the size matters. These services seems to scale, in price, quite poorly. MongoHQ: The larger plan max storage is 20 GB. Seems like a very little storage, for GridFS. MongoMachine: Flat price, 2.5$ per GB. I didn't found the limit. Seems like a good price, comparing the others. MongoLab: 3.984 GB max, which I don't think I will hit, so perfect. 8$ per GB, quite costly. CloudControl: The larger plan is 20 Gb. The custom service starts at 250€ plus some unspecified charge per GB. What is your experience with these services? Any downtimes? Other possibilities?

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• Cisco 1841 and routing /29 address

  - by Jonathan

  Could someone please explain in general terms how I'd configure a Cisco 1841 (2x ethernet ports) to route a public /29 address block (6 hosts) to my internal network. I wish to give the Cisco router one public IP and then several of my internal Windows servers will receive the other public IP addresses. Other hosts behind the router will access Internet via NAT. I'm a bit confused as I've only ever setup routers/firewalls that had a single public IP address with NAT and port forwarding to internal servers.

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• Slow DB Performance. Seems to be memory related.

  - by David

  I am seeing a pooorly performing web app with a SQL 2005 backend. The db is on a w2k3 machine with 4GB RAM. When I run perfmon on it I see the following. Page life expectancy is low. Consistently under 300 while the Buffer cache hit ratio is always 99% +. The target server memory is always 1618304 and the total server memory is always a number just below that. So it seems that it isn't grabbing enough of the available memory. I have AWE enabled, with the lock pages right for the SQL service account and have set a maximum of 2.25Gb... but it doesn't go near that. When I restart the SQL service the page life expectancy goes much higher, 1000+, and the total target memory starts at 0 and slowly works its way back up to the previous limit. Then it hits the limit and the page life expectancy goes back down massively to <300. So I'm guessing there is something limiting the amount of memory. Any ideas on what that would be and how I can fix it?

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• What options can be put into a SSH authorized_keys file?

  - by mozillalives

  I found this article on options that can be put before a key in the authorized_keys file. I was wondering though, are there more? Options listed in the article are from="domain" command="commandtorun" no-port-forwarding no-X11-forwarding no-agent-forwarding no-pty

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• Make website reachable through domain?

  - by Msmit1993

  I'm learning to use IIS 7 but I don't understand how I can make my website available through a domain. I have a domain as example I will call it www.test.com I have made a website in IIS, running on port 80 and can be viewed by typing the IP of the server in the address bar of my browser. So if I type www.test.com in the address bar how do I make my IIS website show up, without a redirect of course, I don't want users to see the IP in the address bar.

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• RabbitMQ Management console not working

  - by rrejc

  I have started with RabbitMQ. I have a (windows) machine on which I installed two RabbitMQ nodes as a service - I have choose the nodename, port and service name for each of them. The services are running normally (i see that they are listening in a netstat-a). I have also installed management plugin with "rabbitmq-plugins enable rabbitmq_management" and restarted both services. But the plugin isn't running - I dont see it listening in a netstat and I can't connect to the management console via browser. Any idea what could be wrong? Is there any log to see what is goind on? Updated: when I do rabbitmq-plugins list i get: c:\RabbitMq\sbin>rabbitmq-plugins list [e] amqp_client 3.0.1 [ ] cowboy 0.5.0-rmq3.0.1-git4b93c2d [ ] eldap 3.0.1-gite309de4 [e] mochiweb 2.3.1-rmq3.0.1-gitd541e9a [ ] rabbitmq_auth_backend_ldap 3.0.1 [ ] rabbitmq_auth_mechanism_ssl 3.0.1 [ ] rabbitmq_consistent_hash_exchange 3.0.1 [ ] rabbitmq_federation 3.0.1 [ ] rabbitmq_federation_management 3.0.1 [ ] rabbitmq_jsonrpc 3.0.1 [ ] rabbitmq_jsonrpc_channel 3.0.1 [ ] rabbitmq_jsonrpc_channel_examples 3.0.1 [E] rabbitmq_management 3.0.1 [e] rabbitmq_management_agent 3.0.1 [ ] rabbitmq_management_visualiser 3.0.1 [e] rabbitmq_mochiweb 3.0.1 [ ] rabbitmq_mqtt 3.0.1 [ ] rabbitmq_old_federation 3.0.1 [ ] rabbitmq_shovel 3.0.1 [ ] rabbitmq_shovel_management 3.0.1 [ ] rabbitmq_stomp 3.0.1 [ ] rabbitmq_tracing 3.0.1 [ ] rabbitmq_web_stomp 3.0.1 [ ] rabbitmq_web_stomp_examples 3.0.1 [ ] rfc4627_jsonrpc 3.0.1-git7ab174b [ ] sockjs 0.3.3-rmq3.0.1-git92d4ba4 [e] webmachine 1.9.1-rmq3.0.1-git52e62bc

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• IIS6 Log time recording problems

  - by Hafthor

  On three separate occasions on two separate servers at nearly the same times, 6.9 hours seemingly went by without any data being written to the IIS logs, but, on closer inspection, it appears that it was all recorded all at once. Here's the facts as I know them: Windows Server 2003 R2 w/ IIS6 Logging using GMT, server local time GMT-7. Application was still operating and I have SQL data to prove that Time gaps appear in log file, not across two # headers appear at gap Load balancer pings every 30 seconds No caching Here's info on a particular case: an entry appears for 2009-09-21 18:09:27 then #headers the next entry is for 2009-09-22 01:21:54, and so are the next 1600 entries in this log file and 370 in the next log file. about half of the ~2000 entries on 2009-09-22 01:21:54 are load balancer pings (est. at 2/min for 6.9hrs = 828 pings) then entries are recorded as normal. I believe that these events may coincide with me deploying an ASP.NET application update into those machines. Here's some relevant content from the logs in question: ex090921.log line 3684 2009-09-21 17:54:40 GET /ping.aspx - 80 404 0 0 3733 122 0 2009-09-21 17:55:11 GET /ping.aspx - 80 404 0 0 3733 122 0 2009-09-21 17:55:42 GET /ping.aspx - 80 404 0 0 3733 122 0 2009-09-21 17:56:13 GET /ping.aspx - 80 404 0 0 3733 122 0 2009-09-21 17:56:45 GET /ping.aspx - 80 404 0 0 3733 122 0 #Software: Microsoft Internet Information Services 6.0 #Version: 1.0 #Date: 2009-09-21 18:04:37 #Fields: date time cs-method cs-uri-stem cs-uri-query s-port sc-status sc-substatus sc-win32-status sc-bytes cs-bytes time-taken 2009-09-22 01:04:06 GET /ping.aspx - 80 404 0 0 3733 122 3078 2009-09-22 01:04:06 GET /ping.aspx - 80 404 0 0 3733 122 109 2009-09-22 01:04:06 GET /ping.aspx - 80 200 0 0 278 122 3828 2009-09-22 01:04:06 GET /ping.aspx - 80 200 0 0 278 122 0 2009-09-22 01:04:06 GET /ping.aspx - 80 200 0 0 278 122 0 ... continues until line 5449 2009-09-22 01:04:06 GET /ping.aspx - 80 200 0 0 277 122 0 <eof> ex090922.log #Software: Microsoft Internet Information Services 6.0 #Version: 1.0 #Date: 2009-09-22 00:00:16 #Fields: date time cs-method cs-uri-stem cs-uri-query s-port sc-status sc-substatus sc-win32-status sc-bytes cs-bytes time-taken 2009-09-22 01:04:06 GET /ping.aspx - 80 200 0 0 277 122 0 2009-09-22 01:04:06 GET /ping.aspx - 80 200 0 0 277 122 0 ... continues until line 367 2009-09-22 01:04:06 GET /ping.aspx - 80 200 0 0 277 122 0 2009-09-22 01:04:30 GET /ping.aspx - 80 200 0 0 277 122 0 ... back to normal behavior Note the seemingly correct date/time written to the #header of the new log file. Also note that /ping.aspx returned 404 then switched to 200 just as the problem started. I rename the "I'm alive page" so the load balancer stops sending requests to the server while I'm working on it. What you see here is me renaming it back so the load balancer will use the server. So, this problem definitely coincides with me re-enabling the server. Any ideas?

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• Nagios DNX plugins

  - by danneh3826

  I'm toying with the idea of multiple Nagios instances setup to monitor our infrastructure. I've looked at all the various methods of distributed Nagios checks, and I think DNX comes out the closest. DNX handles failure of worker nodes, that's fine. What happens if the main DNX server fails though? Is there a way to replicate the server too? I'm using AWS EC2 primarily, so I can utilise Elastic Load Balancing for the web UI, but I need to be able to handle the AZ where the monitoring server is to fail over, and essentially for a second to pick up the checking load (active/passive, active/active, so long as it doesn't fail completely) The other thing I'm trying to solve is an issue with routing. What I'd like is to have multiple nodes report a fault before Nagios confirms it as critical. Not the NRPE checks, as they're pretty self explanitory, but things more like check_ping. I often have routing issues out of AWS to certain datacenters, so Nagios can often report bad/no ping/timeout as a critical issue, even though the machine in question is working fine. Would it be possible to have a setup where a worker complains a service check is critical, and have a second worker node (positioned in another datacenter/AZ) also report the service as critical before the Nagios central server issues a critical alert? I realise I might be asking a bit much (how far down the line do you go setting up failover systems before it starts to get ridiculous), however surely someone must have thought of this scenario when developing DNX?

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• Can joomla be configured to browser through a proxy server?

  - by Aseques

  In wordpress there are some simple variables that can be set to make the configuration of a navigation proxy server trivial. var $proxy_host = ""; // proxy host to use var $proxy_port = ""; // proxy port to use var $proxy_user = ""; // proxy user to use var $proxy_pass = ""; // proxy password to use Are there any equivalents to accomplish the same for joomla? I've been searching on internet and couldn't find anything. For the original wordpress source see here

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• How to optimally configure memcache running on 16 cores 144G ram server?

  - by Ivko Maksimovic

  Memcache is the only important app running on the server Server has 16 cores and 144G RAM Memcache is given 135G Memcache runs at 32 threads Gigabit network, test shows at least 300Mbit/s availability on network port 600 connections 3000 requests per second Say that memcache (memory) usage is at 50% - it's definitely not full As we increase number of requests towards server, requests slow down (from 8ms to 100ms per request) but server load remains 0.00. We suspect this can be solved by adjusting configuration but we don't understand many of the configuration parameters (besides, maybe, the number of threads). Any ideas?

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• Add second ip address to an existing SQl 2008 failover clustering

  - by Cédric Boivin

  Hello, I got actually a failover cluster on Windows Server 2008, with sql server 2008. On each server i got two network card, with two different network one are on 10.10.10.x and other are on 192.168.99.x I want my sqlserver cluster listen on the two network. Is it possible and how i add new ip address. When i add a new ip address directly in the cluster, and i do a telnet on the 1433 port with the new cluster ip address it's not working. Thanks

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• PC in POST loop

  - by Antony Scott

  Hi, I have a custom built PC using a Gigabyte GA-EP35-DS3P motherboard with a Q6600 CPU. For the last 2 days it has got itself stuck into a POST loop. Saying that, I don't think it actually got in to the BIOS. It repeatedly lit up the LEDs and then not much more. Sometimes I could see the CPU fan twitch. Today I re-seated the DIMMs and it powered up straight away. Could this be a sign of an impending hardware failure? The PC is hooked up to a UPS, so I don't think it's a power spike or anything like that, as I have 2 other PCs on the same UPS and they're both fine. Yesterday, the first time this happened, I was getting a message which I think said "Scanning BIOS image on hard drive". I've been building and using PCs for well over 25 years and that's a new one on me! I don't think it's an over heating problem, as when the PC does finally boot up the CPU is running at 35-40C. Any help or suggestions would be greatly appreciated.

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• Toggle-able USB hub with more than one input and output?

  - by user74757

  I recently came across this product: http://ppa-usa.com/shared-network-hub-4-port-usb.html The only problem is, this is nearly opposite of what I need. Ideally, I'm looking for a USB hub-like device that can accept at least two devices for input, and toggle those two devices between at least 2 PC's. The hub linked above appears to be only able to accept one device. Does anyone know of such a product?

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• Any ideas why Ettercap filters aren't seeing packet data?

  - by Bryan

  I'm using an Ettercap filter to detect a query response coming back from a particular service on a remote machine. When I see a response from the service, I'm searching through the data in the packet to see if an offset is a specific value, and if so I'm changing the value at another offset. Trouble is, when I try this on a new virtual machine I built my Ettercap filter's no longer getting any data in the DATA.data variable available to it. if(ip.proto == TCP && tcp.src == 17867) { msg("Response seen!\n"); if(DATA.data + 2 == "\0x01") { msg("Flag detected!\n"); DATA.data + 5 = 0x09; } } The filter's getting applied to the traffic because "Response seen!" messages get printed out by Ettercap. However, "Flag detected!" messages do not. I think DATA.data is indeed empty because if I change my second "if" statement to check for DATA.data == "" then the "Flag detected!" message gets printed. Any ideas why this may be happening?! Also, if this is the wrong site to be asking questions like this, please let me know. I wasn't sure if it fit better here or somewhere like superuser or serverfault. By the way, this is a cross-post from StackOverflow... I should have posted on this forum instead I think. :)

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• Recommendations for good Unix MTA / groupware solutions? [closed]

  - by Jez

  Possible Duplicate: Exchange server replacement that runs on Linux I'm setting up a Debian server, and one of the things I need on it is an MTA. I don't want to use something like Exim or Postfix because I want something that ties in SMTP, POP3, and IMAP all in one (a la Microsoft Exchange). Most MTAs also seem to be hellishly difficult to configure. Try and read the Exim documentation; you could do a university degree on it (I'm not kidding). When you can get an HTTP server like Cherokee which is easy to configure and has a nice web interface, do MTAs or groupware solutions need to be that hard? I'm aware that some people think "the Unix way" is to have lots of different interacting pieces of software (like maybe an SMTP MTA, POP3 service, webmail service, and overarching manager to tie them all together), but I think this is a situation where that just makes things a lot harder to deal with and one large software suite fits in much more nicely. So, I'm looking for good open source software suites that will run on Debian that: Combine (at least) SMTP, POP3, and IMAP Are easy(ish) to configure Have a nice configuration web interface or GUI Are not defunct projects I don't mind if it's groupware and offers calendaring too, but I would only be using the e-mail functionality for now. Another nice-to-have would be built-in webmail (if we're combining a bunch of functionality, why not?) Note however that I do NOT need Outlook support. I am not really looking for an "Exchange replacement drop-in". The suites I've found so far that seem to match the above criteria (and have appropriate licenses) are Citadel, Kolab, and Zimbra. I'd appreciate anyone who has experience with any of these giving me the pros and cons of them, such as how easy they are to configure and what their performance is like. I'd also appreciate any other suggestions for solutions that fulfil my criteria that I may have missed out.

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• Prevent Linux from processing incoming ICMP Host unreachable packets

  - by bbc

  I have a test setup with one host on a network (10.1.0.0/16) talking via TCP to another one on another network (10.2.0.0/16) and a gateway in the middle. Sometimes, the TCP connection is lost and while scanning the trace (pcap), I looks like it's because of just one ICMP Host unreachable message sent by the gateway to 10.1.0.1 at some point. 10.1.0.1 then sends a TCP RST to 10.2.0.1. In my opinion, the gateway (pfSense) is broken or not configured correctly but anyway, for testing purposes, I'd like to block this kind of ICMP on the host (10.1.0.1) before it has an influence on my TCP connection (or does it? I'm not even sure). I've tried iptables: iptables -I INPUT -i eth0 -p icmp --icmp-type host-unreachable -j DROP but while it does a good job at preventing userpace applications like ping from receiving these ICMP messages, my TCP connection still comes to an end when the alleged "killer ICMP packet" is sent by the gateway. Am I right about how it is processed? If yes, then what can I do to achieve my goal?

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