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• Mark packets across computers?

  - by eudemo

  I use Transmission on Ubuntu and I'm having this issue, which basically says that QoS is broken because there is no way to limit which outgoing ports uses. I was thinking of doing a dirty and ugly hack and create an interface alias and define QoS based on source address, but was wondering if is there another way. Is it possible to mark the packets on the original machine in some way, using the owner and mark modules of iptables and sending this to the router who does the QoS? From what I understand, mark on iptables only applies to the local machine, so this will not work, but is there another way?

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• mod hosts file, connect to joomla on remote server

  - by Kate

  I've just acquired an account on a remote server with Joomla installed. I was instructed to add xxx.xx.xxx.xx name.ca www.name.ca to the hosts file which I found in /private/etc/ . I had to su to my admin account and use sudo to mod file and found that hosts is also found in /etc/ though it is apparently the same file. I attempted to flush the the DNS cache using dscacheutil -flushcache and then launched Safari and entered address xxx.xx.xxx.xx/administrator but got a 404 error. Joomla was set up for me by the server owner and accessed from his Windows laptop to demonstrate so I know it should work but no go here. Can anyone suggest what the problem might be?

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• Created a new zone in DNS manager - can't get site bindings to work in iis 7

  - by nick gowdy

  Firstly I would like to say that I am a noob when it comes to DNS, I am a web developer and I am trying to setup an intranet site for a charity. I have windows server 2008 and I installed both iis 7 and dns manager. In IIS I have this binding that works - Type: http:// IP Address: 192.168.1.9 Port: 80 Host name: My host name is empty and when I try to navigate to this website on the network, the http code is 200 and the page renders. Now if I try Host name of test.organization.intranet Internet explorer says "Internet Explorer cannot display the webpage" and the server response is aborted. In DNS manager I created a new forward lookup zone of organization.intranet I did this through the configure a dns server wizard and I created a host (A) with the same IP as the one being used in IIS. The full Host name is test.organization.intranet but it doesn't work. Maybe I am missing something obvious because it's not an area of IT that I know very well, but I am stuck for why I can't get it to work.

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• Bad password when logging in via Remote Desktop

  - by Shiraz Bhaiji

  I have just setup a windows 2003 server running in hyper-V. When I log in via Hyper-V it works fine. When I try to login via remote desktop I get a bad user name or password error. I have: Disabled the firewall Enabled remote connections Before I did the above I did not get to the login screen. I can ping the ip address of the image. I am trying to login as Administrator. Anyone have an idea about how to fix this? Edit I have now managed to fix this by changing the password to something without special characters. Strange thing is the I could not see any problems with the passord, had tried typing it into the user name field to check it.

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• Can't browse computer via nlb cluster name

  - by peg_leg

  I have a fileserver nlb cluster, currently set to single affinity, made up of 2 2008R2 servers. We switched the primary node today. Now our Windows XP workstations can't browse to the cluster name (i.e. \fileserver) but can browse to the cluster ip address (i.e. \192.168.1.1) and can browse the member server by name (i.e. \filesvr1). I remember having a similar issue when we had to change a registry setting to allow Windows XP boxes to see another file server that was in a failover cluster but had to be referred to by another name (\thisfileserver instead of \fileserver). Convoluted, for sure, but it helped to prevent any code changes from happening. Well all of the programmers have their code on \fileserver and we can't have them switch their links every time \filesvr1 supercedes \filesvr2 or vice versa. I can't remember that registry setting that allowed the file server to ignore that it's being called by the wrong name. HELP!

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• How to access vm inside a vm via VNC?

  - by can.

  For some reasons I installed virtual machines inside a virtual machine, like this: A( B( C )) where A is the physical machine, B is a vm and the network type is NAT. And C is also a virtual machine and the network type is bridged. The OSes are Ubuntu 12.04 and the hypervisors are kvm. I can access B via VNC and via ssh from A, but for C I can't use ssh because C has no IP address at the start. And I assume I can only access C via VNC. I tried something like(on A): iptables -t nat -A PREROUTING -d $ip-of-A -p tcp --dport 6500 -j DNAT --to-destination $ip-of-B:5900 (I referred to this) But it doesn't work. And I'm reading the man pages of iptables and hope someone could help :)

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• ssh can't connect after server ip changed

  - by Kery

  I have a server with ubuntu installed. After I change the network configuration and restart server, ssh client can't connect server any more. But in the server I can use ssh client to connect itself and the netstat command shows that sshd is listening port 22. And in my computer (win7) ping command is OK to server's new IP. The configuration in /etc/network/interfaces is: auto eth0 iface eth0 inet static address 10.80.x.x netmask 255.255.255.0 gateway 10.80.x.1 I'm very confused about this. Hope somebody can give me some idea. Thank you in advance!!!

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• problems establishing ssh connection

  - by Superbyte

  since two days I am facing a really weird problem. I have receantly installed ubuntu server 14.04 LTS on a workstation. It has a fix IP address, which I can successfully ping from other computers in the network. But when I try to establish a ssh connection from a windows computer via putty I get some strange errors, which I cannot fix. The Problem is that putty takes a really long time trying to establish a connection. After about 10 seconds I get the following error: Network error: Software caused connection abort But when I click the Restart Session option a several times after putty shows the error message, I can login in. But now comes the other problem. When the login appears on the putty console I type in the user, but it really takes a long time until I can type in the password to login. This is what I already tried: sshd: ALL in etc/hosts.allow commented line session optional pam_motd.so in etc/pam.d/login and etc/pam.d/sshd configured the firewall with: sudo iptables -A INPUT -p tcp --dport ssh -j ACCEPT checked if ssh server is listening on port 22 UseDNS no in etc/ssh/sshd_config I hope someone can help me, because this problem is really annoying. Thanks in regard

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• Help with DB Structure, vOD site

  - by Chud37

  I have a video on demand style site that hosts series of videos under different modules. However with the way I have designed the database it is proving to be very slow. I have asked this question before and someone suggested indexing, but i cannot seem to get my head around it. But I would like someone to help with the structure of the database here to see if it can be improved. The core table is Videos: ID bigint(20) (primary key, auto-increment) pID text airdate text title text subject mediumtext url mediumtext mID int(11) vID int(11) sID int(11) pID is a unique 5 digit string to each video that is a shorthand identifier. Airdate is the TS, (stored in text format, right there maybe I should change that to TIMESTAMP AUTO UPDATE), title is self explanatory, subject is self explanatory, url is the hard link on the site to the video, mID is joined to another table for the module title, vID is joined to another table for the language of the video, (english, russian, etc) and sID is the summary for the module, a paragraph stored in an external database. The slowest part of the website is the logging part of it. I store the data in another table called 'Hits': id mediumint(10) (primary key, auto-increment) progID text ts int(10) Again, here (this was all made a while ago) but my Timestamp (ts) is an INT instead of ON UPDATE CURRENT TIMESTAMP, which I guess it should be. However This table is now 47,492 rows long and the script that I wrote to process it is very very slow, so slow in fact that it times out. A row is added to this table each time a user clicks 'Play' on the website and then so the progID is the same as the pID, and it logs the php time() timestamp in ts. Basically I load the entire database of 'Hits' into an array and count the hits in each day using the TS column. I am guessing (i'm quite slow at all this, but I had no idea this would happen when I built the thing) that this is possibly the worst way to go about this. So my questions are as follows: Is there a better way of structuring the 'Videos' table, is so, what do you suggest? Is there a better way of structuring 'hits', if so, please help/tell me! Or is it the fact that my tables are fine and the PHP coding is crappy?

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• Why is my system using port 4?

  - by Kathleen

  I have Windows 7 and have noticed that my system is using port 4 to connect to a lot of different IP addresses. When it connects to them it is not for very long before it moves to another IP address. One night I sat and wrote down as many as I could and started checking whois to see where they were and they were from all over the world. I don't understand this. When I did a search on the net with this question. The only info I could come up with was, that port 4 is used by the US Army and a list of port assignments listed it as "unassigned". If anyone has any clues to what is going on... I would greatly appreciate any info I could get.

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• DNS problems : correct nameserver, namserver working, but not resolving

  - by user1719624

  My problem is as follows. Any suggestions are welcome. [domain].org is not resolving whois and checking the registry information shows that the correct nameserver is set. The primary nameserver is also the server on which domain.org is hosted. The primary nameserver is also used for a number of other domains, and is working fine for those. Logging into the server, I can ping [domain].org and it resolves correctly. Setting the nameserver as my own DNS server on my laptop, and the URL resolves correctly. If the domain has the correct nameserver set, and the nameserver can resolve the URL to the correct IP address, and if I use the nameserver as my DNS then it resolves correctly, AND the nameserver is used for other domains which are resolving correctly, then why isn't it working? NB : this is a new domain registration and has been set up for around 10 days now, so it's not simple slow propagation. Any ideas? thanks

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• Able to send, but not receive from gmail.com within Outlook 2003 (0x800CCC0F)

  - by matt_tm

  In my home network, I'm able to access my @gmail.com and @otherdomain.com accounts via POP3 from Outlook 2003. When accessing from my office network, I'm not able to receive, but am able to send. I get the following error: Task '[email protected] - Receiving' reported error (0x800CCC0F) : 'The connection to the server was interrupted. If this problem continues, contact your server administrator or Internet service provider (ISP).' The POP3 is set to 995 (using SSL), SMTP to 465 (using SSL), Logon using SPA is NOT enabled. There is NO change I make on my system from the office to home network, except my local, internal IP address changes.

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• Wifi Hotspot not created in ubuntu 12.04

  - by user2406568

  I am using Hp Pavillion g4 with braodcom wireledd adpater. I have the following hardware configuration, for lan and wifi eth0 Link encap:Ethernet HWaddr 10:1f:74:b2:61:cc inet addr:10.3.10.45 Bcast:10.3.11.255 Mask:255.255.252.0 inet6 addr: fe80::121f:74ff:feb2:61cc/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:190855 errors:0 dropped:0 overruns:0 frame:0 TX packets:133209 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:77642990 (77.6 MB) TX bytes:25290447 (25.2 MB) Interrupt:44 Base address:0x6000 eth1 Link encap:Ethernet HWaddr 38:59:f9:7d:d6:b2 inet addr:10.3.9.180 Bcast:10.3.11.255 Mask:255.255.252.0 inet6 addr: fe80::3a59:f9ff:fe7d:d6b2/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:245562 errors:82 dropped:0 overruns:0 frame:408011 TX packets:90383 errors:260 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:140772881 (140.7 MB) TX bytes:13041542 (13.0 MB) Interrupt:16 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:3230 errors:0 dropped:0 overruns:0 frame:0 TX packets:3230 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:435198 (435.1 KB) TX bytes:435198 (435.1 KB) whenever I click on create hotspot nothing happens. Any solution???

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• Image mapping using lookup tables [on hold]

  - by jblasius

  I have an optimization problem. I'm using a look-up table to map a pixel in an image: for (uint32_t index = 0u; index < imgSize; index++) { img[ lt[ index ] ] = val; } Is there a faster way to do this, perhaps using a reinterpret_cast or something like that? I am accessing two different memory addresses, so what is the compiler doing? One solution is to do a set of reads to access adjacent memory addresses. struct mblock { uint32_t buf[10u]; }; mblock mb; for (uint32_t index = 0u; index < imgSize; index += 10u) { mb = *reinterpret_cast<mblock*>(lt + index)); for (uint8_t i = 0u; i < 10u; i ++) { mb.buf[i] += img; } for (uint8_t i = 0u; i < 10u; i ++) { *( mb.buf[i] ) = val; } } This speeds up the code because I'm separating the image access from the table look-up; the positions in the look-up table are adjacent. I still get the image access problem as it is accessing random address positions.

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• Best language on Linux to replace manual tasks that use SSH/Telnet? [on hold]

  - by Calab

  I've been tasked to create and maintain a web browser based interface to replace several of the manual tasks that we perform now. I currently have a "shakey" but working program written in Perl (2779 lines) that uses basic Expect coding, but it has some limitations that require a great deal of coding to get around. Because of this I am going to do a complete rewrite and want to do it "right" this time. My question is this... What would be the best language to use to create a web based interface to perform SSH/Telnet tasks that we would normally do manually? Keep in mind the following requirements: Runs on a CentOS Linux system v5.10 Http will be served by Apache2 This is an INTRANET site and only accessible within our organization. User load will be light. No more that 5 users accessing it at one time. perl 5.8.8, php 5.3.3, python 2.7.2 are available... Not sure what other languages to check for, or what modules might be installed in each language. The web interface will need to provide progress indicators and text output produced by the remote connection, in real time as it is generated. If we are running our process on multiple hosts, they should be in individual threads so that they can run side by side, not sequentially. I want the ability to "trap" on specific text generated by the remote host and display an alert to the user - such as when the remote host generates an error message. I would like to avoid as much client side scripting (javascript/vbscript) as I can. Most users will be on Windows PC's using Chrome or IE as a browser. Users will be downloading the resulting output so they can process it as they see fit. I currently have no experience with "Ajax" or the like. Most of my coding experience is old 6809 assembly, Visual Basic 6, and whatever I can cut/paste from online examples in various languages (hence my "shaky" Perl program) My coding environment is Eclipse for remote code editing, but I prefer stuff like UltraEdit if I can get a decent syntax file for the language I'm using. I do have su access on the server, but I'm not the only one using this server so I can't just upgrade/install blindly as I might impact other software currently running on the machine. One reason that I'm asking here, instead of searching (which I did) is that most replies were, "use language 'xyz', but you need to use an external SSH connection" - like I'm using Expect in my Perl script. Most also did not agree on what language that 'xyz' should be. ...so, after this long posting, can someone offer some advice?

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• Is there a way to get Postfix to both forward an e-mail *and* reject it via recipient_address_rejected

  - by Mac

  In postfix, I'd like a way to deal with e-mail accounts that are no longer active by having postfix send the standard "Recipient address rejected" type message, but still forwarding the e-mail to another user. Thus, if someone sends an e-mail to [email protected], it will bounce the message back to the sender for future reference, but the mail will still get forwarded to [email protected] to deal with. .vacation and / or .forward files let me down because they will either reply or forward, but not both. Any tips?

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• Empty AAAA DNS Record with long TTL?

  - by Joel K

  I pay for a DNS service based on queries per second. We are not using IPv6, but a large number of queries (that I pay for) are coming in for AAAA records. I understand that most DNS stacks will now ask for A and AAAAs at the same time, and that I can't change that. What I /would/ like to do is put something in the AAAA records with a long TTL. (decreasing my hit rate) Is there anything I can put? Null? The equivalent IPv4 Address? Any guidance would be appreciated.

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• SSH Tunnel doesn't work in China

  - by Martin

  Last year I was working in China for a few months. I never bothered setting up a real VPN, but just created a SSH tunnel, and changed my browsers proxy settings to connect through it. Everything worked great (except flash of course) but that was fine. However, now I'm back in China but I'm having problems with this approach. I do the same thing as last time, and according to https://ipcheckit.com/ my IP address is indeed the IP of my (private) server in the US, and I'm logging in to my server using a fingerprint I created long before going to China so no MITM should be possible. Furthermore the certificate from ipcheckit.com is from GeoTrust - so everything should be OK However, I still can't access sites which are blocked in China. Any idea how this could be possible?

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• Authenticating SSL in Paros Proxy

  - by Chevi

  I need to inspect some traffic from my iPhone to debug an application, which is going and coming from an https address. Since I don't have a Mac at the moment, I tried with Paros proxy, which I had used before. It's working fine with http connections, but whenever I try to open a website with SSL encryption in Mobile Safari it says that the certificate is not trusted. I can "Continue" and it would work, but not on Applications. How can I set up a trusted certificate with Paros and the iPhone? Thanks in advance, Alex UPDATE: I'm going to try and create my own SSL certificate for testing with Windows' MakeCert UPDATE 2: For some reason I could get Windows SDK to install, so I haven't tried this yet...

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• lshw not showing network

  - by triunenature

  Output: {User}@{Computer}:~$ sudo lshw -class network {User}@{Computer}:~$ Another Test: {User}@{Computer}:~$ lspci 00:00.0 RAM memory: NVIDIA Corporation MCP61 Memory Controller (rev a1) 00:01.0 ISA bridge: NVIDIA Corporation MCP61 LPC Bridge (rev a2) 00:01.1 SMBus: NVIDIA Corporation MCP61 SMBus (rev a2) 00:01.2 RAM memory: NVIDIA Corporation MCP61 Memory Controller (rev a2) 00:02.0 USB controller: NVIDIA Corporation MCP61 USB 1.1 Controller (rev a3) 00:02.1 USB controller: NVIDIA Corporation MCP61 USB 2.0 Controller (rev a3) 00:04.0 PCI bridge: NVIDIA Corporation MCP61 PCI bridge (rev a1) 00:05.0 Audio device: NVIDIA Corporation MCP61 High Definition Audio (rev a2) 00:06.0 IDE interface: NVIDIA Corporation MCP61 IDE (rev a2) 00:07.0 Bridge: NVIDIA Corporation MCP61 Ethernet (rev a2) <<---- Network Card???? 00:08.0 IDE interface: NVIDIA Corporation MCP61 SATA Controller (rev a2) 00:08.1 IDE interface: NVIDIA Corporation MCP61 SATA Controller (rev a2) 00:09.0 PCI bridge: NVIDIA Corporation MCP61 PCI Express bridge (rev a2) 00:0b.0 PCI bridge: NVIDIA Corporation MCP61 PCI Express bridge (rev a2) 00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration 00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map 00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller 00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control 01:05.0 FireWire (IEEE 1394): LSI Corporation FW322/323 (rev 70) 02:00.0 VGA compatible controller: NVIDIA Corporation G96 [GeForce 9500 GT] (rev a1) If you look at 00:07.0 I believe that is the network card. However lshw doesnt show it. I mainly need information on network speed 10MBpS/100MBsP/1000MBpS Though knowing why my system isn't working would be nice.

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• Redirecting and Remapping with mod_rewrite

  - by Droid646197

  First of all, am new to doing back-end server admin.. I have a main website being served on at certain IP. I have a blog address that lives on another IP, which was used on wordpress.com. When a user typed in blog.domain.com it would resolve to the Wordpress.com site. Since coming on board (two months) they wanted me to bring the blog in house. So, I set up a wordpress install at domain.com/blog. I would like blog.domain.com (different ip) to resolve to domain.com/blog but still using blog.domain.com is this possible with Apache and mod_rewrite?

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• Eliminate single point of failure for webservers?

  - by George Bailey

  I know in DNS, that each of the DNS servers will be tried to see if they will respond I know in email that in the event of a failure it will go to the next one in the list or it will hold the mail for a period of time As far as I know,, in webservers,, the browser will get one of the webserver IP addresses and try it and if it fails it will give up. Is this correct? If so,, then the only way to direct traffic away from a failed IP address would be with the DNS servers.. and even that would not update immediately?

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• Linux PHP web server horribly slow when accessed from any windows browser

  - by Ed Harcourt

  I have a Linux server (Ubuntu 10.04) running apache2 and PHP. Everything runs fine when accessing a page from any browser from another Linux machine or Mac. But when I try to access a page from any combination of Windows machine and browser I get about a 30 second delay before the page comes back. Accessing a plain old HTML file from the Windows browser runs lickity split. So it seems to be just PHP. MySQL is installed but a simple test page that uses no MySQL is still slow. I don't think it is DNS because if I hard code the IP address in the URL nothing changes. There doesn't seem to be anything in the log files that I can tell. What could be causing this behavior on Windows clients?

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• Publish database between two open database connections (Visual Studio 2005)

  - by danielswe

  I have two data locations, one to a local and one to a remote database. How do I copy the local database schema to the remote? The reason I don't use "Publish to provider" is that I'm not sure that I have all the information necessary to do so. I have the database name, server, username and pass but not "web service address" nor "web service password". I work in Visual Studio 2005. The server is a MSSQL 2005 server. I have tried using the queries but I only get errors doing so.

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• NFS mount of /var/www to OS X

  - by ploughguy

  I have spent 2 hours trying to create an NFS mount from my Ubuntu 10.04 LTS server to my OS X desktop system. Objective: three way file compare between the code base on the Mac, the development system on the local Linux test system, and the hosted website. The hosted service uses cpanel so I can mount a webdisk - easy as pie - took 10 seconds. The local Ubuntu box, on the other hand - nothing but pain and frustration. Here is what I have tried: In File Browser, navigate to /var/www/site and right-click. Select share this folder. Enter sharename wwwsite and a comment. Click button "Create Share". Message says - you can only share file systems you own. There is a message on how to fix this, but the killer is that this is sharing by SMB. It will change the LFs to CR-LFs which will affect the file comparison. So forget this option. In a terminal window, run shares-admin (I have not been able to convince it to give me the "Shared Folders" option in the System Administration window - Maybe it is somewhere else in the menu, but I cannot find it) define an NFS export. Enter the path /var/www/site, select NFS enter the ip address of the iMac and save. On the mac, try to mount the file system using the usual methods - finder, command line "mount" command - not found. Nothing. Tried restarting the linux box in case there is a daemon that needs restarting - nothing. So I have run out of stuff to do. I have tried searching the documentation - it is pretty basic. The man page documentation is as opaque as ever. Please, oh please, will someone help me to get this @38&@^# thing to work! Thanks for reading this far... PG.

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