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• Very Large number of connections in TIME_WAIT state; Server is slow, ipconntrac

  - by Sparsh Gupta

  I have a nginx server with load balancing and reverse proxy. Right now its behing another nginx but very soon I plan to make it front, where it will receive TCP connections from clients directly at a rate of 500req/second I am having some big troubles with the server. I have pasted my configurations here and I am kinda sure that the problem is with ipconntrac and similar things which are alient to me http://paste.org/pastebin/view/28543 root@load_balancer:/proc/sys/net/ipv4# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c 67 CLOSING 727 ESTABLISHED 173 FIN_WAIT1 183 FIN_WAIT2 19 LAST_ACK 5 LISTEN 447 SYN_RECV 1 SYN_SENT 27970 TIME_WAIT Its a ubuntu machine with mainly nginx (load balancer and reverse proxy) installed. It surely isnt great. Can you help me understand whats going on and how can I fix it. This is my live server and I am sure its in a bad shape right now. Any document or commands to fix this, or settings I should make to make this better and reduce time wait and fin_wait1/2 better would be awesome.

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• how to disable isight auto adjustments ?

  - by George Profenza

  The built-in isight cam on my macbook machine keeps re-adjusting the lighting (and focus I think). I need to manually set those, but I found nothing of any use in System Preferences or System Profiler. Any way to access the settings ? Any magic terminal commands that allows access to the camera ? Anyone has a driver that allows for any camera access ? 'mac - it just works'...sure, if you want to use it like a kid. the second you actually want to do something with you mac other than the basic things, you can do on ANY regular machine anyway, your 'rights' are done with, as apple seems to only encourage dumb clients. I'm not saying saying this applies to all mac users, but the 'typical/average' one in my view is only going to use it for media(music,video) and web(facebook,blogging, all that) and maybe podcasting,webcasting,etc....ok this is turning into a rant, so I will finish here.

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• Wrong source IP when accessing internet directly from TMG server

  - by jarod1701

  Hi everyone, after implementing a ForeFront TMG server I'm facing only one problem: After I added a second IP to the external adapter I had to manually set "NAT Address Selection" inside the network rule "Internet Access" to the first IP since all others would get blocked by the CISCO firewall. This configuration works as long as traffic comes from the internal network (e.g. browser on clients). Traffic from the TMG directed to the internet always carries the second IP as it's source address and gets blocked. All our other TMGs/ISAs are running fine and I never came across this problem- Does anybody have a clue, coz I don't?! Kevin

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• Can not search my company howto blog site anylonger in Sharepoint

  - by Worldunix

  I have a Howto company Blog site that i post to for my clients to access for help. For some reason it has stopped letting anyone search on it. I can search for Mysites or users. But when you drop down the tab to search: This Site: "blog site name" you get the following reply: No results matching your search were found. Check your spelling. Are the words in your query spelled correctly? Try using synonyms. Maybe what you're looking for uses slightly different words. Make your search more general. Try more general terms in place of specific ones. Try your search in a different scope. Different scopes can have different results. I have tried the following command: from the Index server net stop osearch net start osearch iisreset /noforce But still not able to search a local blog site I can only search for users and Sites. please help Don

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• Can not search my company howto blog site anylonger in Sharepoint

  - by Worldunix

  I have a Howto company Blog site that i post to for my clients to access for help. For some reason it has stopped letting anyone search on it. I can search for Mysites or users. But when you drop down the tab to search: This Site: "blog site name" you get the following reply: No results matching your search were found. Check your spelling. Are the words in your query spelled correctly? Try using synonyms. Maybe what you're looking for uses slightly different words. Make your search more general. Try more general terms in place of specific ones. Try your search in a different scope. Different scopes can have different results. I have tried the following command: from the Index server net stop osearch net start osearch iisreset /noforce But still not able to search a local blog site I can only search for users and Sites. please help Don

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• Is there a VNC server for mac with decent international keyboard support?

  - by Stephan

  Hi, I'm having trouble finding a VNC server for Mac OS X that allows me to connect from a Windows box with German keyboard layout. I've tried the built-in desktop sharing and several versions of Vine but all of them had problems with several keys. Does maybe anyone know about a working combination of a Mac OS X VNC server and Windows VNC client which properly supports a German keyboard layout on the client? Update: I don't think the Windows client is the problem, because I have no issues connecting to Linux boxes. And I've tried several different clients.

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• How to integrate Windows Server 2008 R2's NPS with Cisco switches?

  - by Massimo

  I need to evaluate in a lab environment the use of Windows Server 2008 R2's NPS for 802.1x authentication with Cisco Catalyst 3750 switches; the general idea is to only let clients connect to the company network if they can provide valid domain logon credentials, placing them in a restricted VLAN instead if they can't. NAP would also be a bonus, but it can be evaluated later; the main point now is only 802.1x authentication. Although I have very good knowledge of Windows and Active Directory (on the Microsoft side) and quite good knowledge of Catalyst switches (on the Cisco side), I'm totally new to 802.1x; I'd really like some general guidelines and help here, and some sort of implementation guide would also be very useful.

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• FTP error 424 failed to establish connection

  - by cKK

  Getting "ftp error 425 failed to establish connection" when trying to connect to ftp server. Tried 2 ftp clients on 3 machines on same network and none work. However FTP works from home / mobile broadband. No ip blocks on ftp sever. Other ftp servers(differrent ip/hosts) work okay. firewall setup correct, no ports blocked. Is it possible to use a proxy for ftp a i think it's something with the ISP but taking too long to fix?

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• Active Directory Domain Services on remote VPS

  - by Rob Angelier

  I really need help with configuring Active Directory Domain Services on a remote VPS. Situation we have a remote Windows Server 2008R2 VPS and i just installed the Active Directory Domain Services Role. A DNS Server was also configured by default at the end of the Active Directory installation. Problem I can't get my Windows 7 machine to register itself to the domain i have just created Question What are the steps i have to take to test my Active Directory configuration, and how do i connect clients to this Domain? I can provide screenshots and more information if neccesary. looking forward to your replies! best regards, Rob Angelier

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• Forward Windows Events Logs to Rsyslog

  - by SamCulley

  Thanks for taking time to read this post. Basically I would like to forward Windows Events Logs from all my desktop clients to a linux box with rsyslog on. Rsyslog provide a Windows agent to do just that but its 40 euros per license and when you have x amount of machines that cost adds up. I was wondering if there is a FOSS alternative available I have tried searching the Google but haven't managed to find anything. Hopefully someone might already faced this same problem and are using an alternative that they could recommend. Again thanks for reading, Kind Regards Sam

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• High Availability Configuration using Heartbeat and Pacemaker

  - by pradeepchhetri

  I have the following setup: I have configured high availability between two load balancers (HAProxy) so that if HAProxy1 get down, the floating IP gets transferred to the other load balancer HAProxy2, hence all the clients will get the response from HAProxy2, which at the back-end is doing LB among the sme two webserver. This is for removing the single point of failure in case of only one HAProxy. Whenever I stops the hearbeat in HAProxy1, the floating IP goes to HAProxy2. But I want to configure such that whenever the process haproxy goes down, the floating IP should get assigned to HAProxy2. Can someone tell me how to implement it ?

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• exim greylisting non-auth SMTP mail?

  - by artfulrobot

  I have smtp auth set up on my exim4 Dqueeze server so that only auth'ed clients can use it as a mail relay. I believe this is working, e.g. thunderbird (w/out password) reports that I am "not yet authorised to send mail for X from Y". I also have greylistd installed, which I also see to be working. But I've noticed that when an unauthorised connection is made the error is temporarily rejected RCPT <[email protected]>: greylisted Should greylisting be taking effect here? Surely it should just be saying "go away, you're not authorised" rather than filling up a greylist queue?

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• Can't connect using Jail SFTP account

  - by Fazal

  I've been following this tutorial "Limiting Access with SFTP Jails on Debian and Ubuntu" and whilst I've had no errors setting it up, I've had issues on Ubuntu 10.04LTS logging in as a user on a virtualhost. I've changed my SSH port to 22022, and enter all the credentials when attempting to login. I ran these commands to add a user to the virtualhost: # useradd -d /srv/www/[domain] [username] # passwd [username] # usermod -G filetransfer [username] # chown [username]:[username] /srv/www/[domain]/public_html I should add that this is the only time I've setup the user they have no other /home directories or such. The directory that does exist is at /srv/www/example.com/public_html When I try using a desktop package such as cyberduck to login to the site, I keep getting a "Login failed with this username or password". I am completely lost as what to do next... The reason why I'm trying this method is because I want my clients to use SFTP and not FTP to upload files to their websites. Any help or direction is appreciated.

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• Is there such thing as hardware encrypted raid disk?

  - by Dumitrescu Bogdan

  I have a server for which I want to protect the content. The server is located on a clients premises. Is there a way to encrypt the content of a RAID DISK (at hardware level) ? What I need is that the server will not be able to start as long as the required password is not provided (the encryption key) I will give the best answer to Miles, though the answer was not exactly to my question. But from all the comments, it seems that it cannot be done hardware or .. it cannot be done as I would like to.

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• Can I force NFS automounts to use NFSv3?

  - by Steve

  I have a linux server that is exporting NFSv4 as well as NFSv3. I have a Fedora14 client that is defaulting to NFSv4 when automounting NFS shares off of the linux server, and it seems to be causing some problems. All my other linux clients on the network are mounting via NFSv3 without issue, so is there a way I can tell automount to mount the share via v3? I am pulling my automount maps via LDAP, with an entry in my /etc/auto.master file like so: +auto_master, so I assume it's a bit different than listing options with a regular automount map? (.i.e. /home --nfsvers=3 fileserver:/DATA)

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• Dovecot ignoring maximum number of IMAP connections

  - by Michelle

  I have a single mailbox mail server running Dovecot/Postfix and I have two IMAP clients, Thunderbird on the PC and K9 on Android. I keep on receiving this error in my logs even after I change the 'mail_max_userip_connections' variable to 50. puppet dovecot: imap-login: Maximum number of connections from user+IP exceeded (mail_max_userip_connections=10): user=<[email protected]>, method=PLAIN, rip=62.242.90.2, lip=198.29.31.229, TLS Why does it say that it is set to 10 in the log? Is that hardcoded? grep -r "mail_max_userip_connections" /etc/dovecot /etc/dovecot/conf.d/20-managesieve.conf: #mail_max_userip_connections = 10 /etc/dovecot/conf.d/20-pop3.conf: #mail_max_userip_connections = 3 /etc/dovecot/conf.d/20-imap.conf: mail_max_userip_connections = 50 I've restarted dovecot after making the changes but this error is still logged and I can't access the mailbox. Can anyone help me understand why I can't seem to raise the maximum limit?

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• Setup dhcpd without gateway on purpose

  - by MBober

  I have an XP machine with two network interfaces. One is connected to my company's network (and the Internet). The other is a very local network which connects some hardware with my PC. Both the hardware and my XP machine's second network interface obtain configuration from a dhcpd running on Ubuntu in a virtual machine on my XP machine. I entered some dummy gateway in /etc/dhcp3/dhcpd.conf like 192.168.3.1 which does not match any existing device just to get dhcpd started. The problem is that my XP machine now tries to route Internet traffic through 192.168.3.1 in most of the cases which, of course, results in an error. Is there any way to set up dhcpd in a way that the clients know that there is no gateway in this network? By the way: setting the gateway manually in XP is off the table because this needs administrator privileges which I don't have.

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• Caching DNS server (bind9.2) CPU usage is so so so high.

  - by Gk

  Hi, I have a caching-only dns server which get ~3k queries per second. Here is specs: Xeon dual-core 2,8GHz 4GB of RAM Centos 5x (kernel 2.6.18-164.15.1.el5PAE) bind 9.4.2 rndc status: recursive clients: 666/4900/5000 About 300 new queries (not in cache) per second. Bind always uses 100% on one core on single-thread config. After I recompiled it to multi-thread, it uses nearly 200% on two core :( No iowait, only sys and user. I searched around but didn't see any info about how bind use CPU. Why does it become bottleneck? One more thing, here is RAM usage: cat /proc/meminfo MemTotal: 4147876 kB MemFree: 1863972 kB Buffers: 143632 kB Cached: 372792 kB SwapCached: 0 kB Active: 1916804 kB Inactive: 276056 kB I've set max-cache-size to 0 to make sure bind can use as much RAM as it want, but it always stop at ~2GB. Since every second we got not cached queries so theoretically RAM must be exhausted but it wasn't. Do you have any idea? TIA, -Gk

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• prevent search engines indexing depending on domain

  - by Javier

  We have a dedicated server with a hosting company with a couple of dozens of webs in it. It happens that the nameservers (EG: ns1.domain.com, ns2.domain.com) ip's are coincident with some client webs, let's say webclient1.com and webclient2.com Problem is that for a certain searches in google, some results are showing up like ns1.domain.com/result instead of webclient1.com/result which is pretty wrong and annoying for our clients. Actually if you type in the browser ns1.domain.com or ns2.domain.com it will load some pageclients instead. Is there any way to prevent google to track those results only in case the robots are coming to check ns domains? It may be not correct to ask this as well, but why is it happening? is it a result of a bad server configuration? I'm pretty new on these matters, so thank you in advance for any help!

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• Modify HTML Content with Squid

  - by user38400

  We have setup our network as per the tutorial here: https://help.ubuntu.com/community/Upside-Down-TernetHowTo. Basically, we have a squid proxy that inverts images for pages that clients request. We're trying to modify the script so that we can edit the contents of the webpage before the webpage is sent to the client. We are not having any luck. I'm wondering if there is something different about .html files that makes this not possible. What is happening is that we do a wget on the URI that is requested, save it locally, modify it and then echo back the new URI. The page that the user gets is the unmodified page and not the one that we just changed.

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• Double VPN Network Authentication

  - by Pyromanci

  I have a project I'm working on and looking for some info. Right now I have a VPN network using Cisco Pix 501's for the vpn clients and a Cisco VPN Concentrator 3000 for the VPN Server. Since the Pix is constantly connected to the vpn, I want to add a extra level of authentication. Meaning when the user on the other end goes to access anything on the VPN they are asked for a username password before the connection is established. I've never done this sort of structure before. So I'm not even sure where to really being or even if my current hardware can do something like this, or if i need to through in some sort of radius/LDAP/Active Directory type server into the mix.

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• Should I upgrade Exchange 2003 or just upgrade the hardware?

  - by JohnyD

  My organization currently has a 4 y/o Exchange 2003 email server (32-bit, Intel Pentium D @ 3GHz, 3GB RAM). It's run very well over the past 4 years but it is time to upgrade its hardware. This server would handle email for approximately 30 clients, a few OWA users with iPhones. My (somewhat ambiguous) question is, when I receive the new hardware should I build out a new Exchange 2003 deployment or should I look at Exchange 2007 / 2010? I've heard that Exchange 2010 requires Sharepoint 2010 (which I am currently not running). Are there benefits that a small-medium sized business can or can't do without? Am I making a horrible mistake staying with antiquated software? Other details: Exchange 2003 (v6.5 + SP2) single front-end server All opinions and thoughts are very much appreciated.

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• Apache2 proxypass

  - by gatsby

  i'm trying to figure out why my apache2 reverse proxy doesn't work... hope someone can clarify. i'm using an apache server as a gateway with proxy pass: 10.184.1.2 is the IP. these are PP instructions i inserted in the 000-default config file. ProxyPass / http://192.168.102.31/ ProxyPassReverse / http://192.168.102.31/ the host 192.168.102.31 is an internal IP of a subnet wich is not reachable directly by clients, but only by the apache gateway. when i try to access such a address: http://apache_gateway_name/dir i see the client trying to reach 192.168.102.31 address and of course timeout occurs. can someone help? Best regards

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• Postgresql spawning a ridiculous number of postmaster processes

  - by Kevin Loney

  For some reason postgres is spawning 700 postmaster processes for handling database requests and the postgres log file if full of 'unexpected EOF on client connection', 'incomplete startup packet' and 'sorry, too many clients already'. netstat tells me that all the open connections are local and I'm pretty sure are coming from postgres internally. This particular instance has been running just fine for the last 230 days or so and nothing has changed configuration wise. Any thoughts on where I should be looking to try and resolve this issue? This is my first time diagnosing a problem like this so if there is any steps I can take to help narrow down the cause that would be helpful as well.

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• IIS 6.0 FTP Folder Permissions

  - by Beuy

  I have a IIS FTP website setup like this \ftp\users\domain\public\public Software that runs on clients computers logs into the FTP server by specifying domain\public and moving to public, it then uploads or downloads files / folders into that area. I want to restrict permissions on \ftp\users\domain\public so that nothing/nobody can write files or folders here, only to \ftp\users\domain\public\public. I setup the NTFS permissions of the folder to remove domain\users, public and server\users to not have modify right, yet I can still upload/modify files. I have disabled inheritance from the parent folder of \ftp\users\domain\public as well. Any ideas on what I'm missing here? P.S I know this is a stupid setup and makes no sense, it's some bizarre legacy application that I need to migrate to a safer environment until it can be replaced.

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