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• GNS3 Cannot ping/resolve DNS record

  - by Eldad Cohen

  I set up an internet lab with GNS3, which has 3 routers, in each node there is a computer directly connected. One of the hosts is a DNS server, Windows 2003 Server. The other one is a Windows XP machine. Ping is good between routers and machines but no ability to ping domain.com record on DNS server 2003. I set a static nat on the router to route all traffic from gateway to the DNS server internal ip address, still no answer for the dns request. Any ideas or thoughts will be most welcome.

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• Why doesn't Linode ever have to shut down for updates?

  - by Tom Marthenal

  I've been using Linode for over a year now, and, unlike some lesser-known VPS hosts I've used, I've never been required to shut down my VPS by Linode. The only restarts have been ones I've initiated. How do they go for years on end without requiring restarts and with no downtime? Isn't downtime inevitable when upgrading some parts of the host system? Do they simply perform as few updates as possible? This isn't meant to be a Linode-specific question; I am only using them as an example because I have experience with them.

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• Apache Serving 403 Forbidden after OS X Snow Leopard Upgrade to Version 10.6.6

  - by Ian Oxley

  I've just upgraded my MacBook Pro to OS X Snow Leopard version 10.6.6 and now Apache is misbehaving: requests to http://localhost/ generate a 403 Forbidden response -- FIXED requests to any of my virtual hosts seem to generate a 200 Ok response, but contain zero bytes Some further info that might be useful: I'm using the Apache that comes bundled with OS X. I'm using PHP from http://www.entropy.ch/software/macosx/php/ (which is in /usr/local/bin) I've had look at the Apache error log and the only error seems to be the following: [notice] child pid 744 exit signal Segmentation fault (11) I'm completely stumped by this. Any help would be much appreciated. UPDATE Ok, I've managed to resolve the 403 Forbidden error thanks to http://techtrouts.com/mac-os-x-105-web-sharing-forbidden-403-on-httplocalhostusername/ I'm still having the second problem though for any request e.g. this now happens when I request http://localhost

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• Wrong DNS for just one site on development machine

  - by Patrick

  www.superyoink.de is my clients' website. I can access it from any machine except my development one. If I ping it on my development machine, I get 80.67.28.107 - this is wrong. My laptop, next to me, is able to resolve it correctly. I have tried putting correct address into hosts like so: 93.187.232.191 www.superyoink.de Still resolves to wrong address. I can enter bogus DNS server addresses so nothing works. But www.superyoink.de still resolves to 80.67.28.107. Rebooted, did ipconfig /flushdns nothing seems to work. I run 32 bit Vista. My impression is that it has stored the wrong dns resolution somewhere and is not even trying the DNS servers. But where? Help please!

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• Redirecting to a folder

  - by RN

  Apache2 Plesk 9.x I have a website www.example.com and my blog is on www.example.com/blog I have no content on www.example.com as of now So I want all requests for example.com to be redirected to www.example.com/blog How should I do that ? Is this something I can do in Apache? I am using the GoDaddy DNS server. Not sure if it matters- but I have multiple domains hosted n the same server. And I am using Plesk to manage my virtual hosts.

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• How to fill in the network line in the ubuntu interfaces config file?

  - by matnagel

  I have to configure an ubuntu hardy server network interface. The service hoster told me that this is the network data for the machine: IP Range: 111.111.200.74 to 111.111.200.78 Netmask: 255.255.255.248 Broadcast: 111.111.200.79 Gateway: 111.111.200.73 Subnet: 111.111.200.72/29 I am only using the first IP address. I will update the /etc/hosts file with 111.111.200.74, but I am still unsure how the /etc/network/interfaces file should be. This is my plan: auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 111.111.200.74 netmask 255.255.255.248 network 111.111.200.??? broadcast 111.111.200.79 gateway 111.111.200.73 As you can see I don't know how to build the network line. How would I calculate the data for the network line and what is the result? (I changed the first 2 octets of the subnet, they are not "111.111" in the real setup.)

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• Bacula vs. BackupPC [closed]

  - by ujjain

  I have been googling about the differences between them. Bacula has lots of roles BackupPC is easier to configure Bacula works with agent, not rsync (great for Windows backups) It seems that Bacula is most often compared to Amanda though, while BackupPC seems a perfectly lovely and popular backup distribution to. I currently backup my servers with rsnapshot, but I am looking for a professional scalable solution that could also back-up 50 hosts without problems. Preferably a solution that can offer bare metal restores for my Linux servers. I am not looking to reinstall the exact same version of Plesk, the software, etc... Update: I see this ranks high in Google, I found a good article: http://www.serverfocus.org/backuppc-vs-bacula-vs-amanda. I personally think that BackupPC is good for smaller environment, but Bacula, despite the high learning curve, is better for environments that requilre scaling.

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• DKIM for email through Google Apps domain with external outbound relay

  - by David Gardiner

  I'd like to enable the new Domain Keys DKIM email authentication feature for a domain hosted in Google Apps. Some of my users use an external SMTP gateway (such that when they send email, it doesn't go through smtp.gmail.com). I have an SPF record configured for the domain, and this allows the external SMTP gateways as valid SMTP hosts. (I realise SPF is different to DKIM) Will enabling DKIM adversely affect the external gateway email? eg. Are the externally sent emails at risk of being marked as spam because they would not have the DKIM signature, or will DKIM only positively benefit emails sent through Google's SMTP server?

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• How can I make gitosis distinguish between two users with the same username

  - by bryan kennedy

  I have a gitosis system that seems to be working correctly except for a common problem we run into where I can't distingush permissions between two users who have the same username, but different hosts. For example: [email protected] 's SSH key is in the key folder. And so is [email protected] 's SSH is also in the key folder. These two jsmith's are two different people on two different computers. However, when I configure them in the gitosis.conf file with the usernames jsmith@computer or jsmith@machine, it seems like each user just gets the same permission. Can gitosis not distinguish the full username (name and host)? If not, how do I deal with multiple users accessing our system with common usernames? Thanks for any help.

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• Single Exchange 2007 server - two AD domains

  - by TheCleaner

  CURRENT: single domain, single Exchange 2007 NEW: two domains, single Exchange 2007 Can this be done? Details: Current setup is a single W2k3 domain with a single Exchange 2007 server. We are merging with another company that currently hosts their email with their ISP via POP3. We'd like to start hosting their email on our Exchange server using their existing domain SMTP addresses. They don't have an AD domain at all at the moment. Recommendations? Can I do this with a trust between the 2 domains? Requirements: They can't have multiple SMTP addresses on both domains...such as I've seen with articles pointing to "hosting multiple domains". I want companyA to have the same account settings they've always had...companyB to have the same SMTP address they've had and not an additional one on the current companyA Exchange domain. They should be able to collaborate (calendar, contacts, GALs) but should still be distinguishable based on which company they "work for". Please help...thanks!

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• Why is my vhosts file interfering with my apache deployment?

  - by Avery Chan

  When I enable my vhosts file (i.e. uncomment this line: Include /private/etc/apache2/extra/httpd-vhosts.conf) I am unable to reach localhost. I /am/ able to reach the last virtual host listed in my vhosts file: <VirtualHost *:80> DocumentRoot "/Users/achan/Sites/epwbst" ServerName epwbst </VirtualHost> <VirtualHost *:80> DocumentRoot "/Users/achan/Sites/pxproj" ServerName pxproj </VirtualHost> Typing pxproj in my browser brings up the expected web content. But I am unable to reach epwbst or localhost. If I re-comment the vhost line in my httpd.conf, I am able to reach local host (i.e. "It works!") but obviously am unable to reach my virtual hosts. I don't know how to continue troubleshooting this. Why can't I reach localhost when I've got my vhosts turned on? OS: Mac OS X 10.7 Server version: Apache/2.2.21 (Unix)

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• Tomcat 5.5 - multiple contexts using same path

  - by ctn8iv

  Is it possible to set up multiple contexts using the same path? For example: <Context docBase="/www/websites/site1/java/base" path="/base" reloadable="true"/> <Context docBase="/www/websites/site2/java/base" path="/base" reloadable="true"/> I have two sites that use the same path both running on the same server/IP. The sites use different virtual hosts and different ServerNames, but I have no control over the directory structure of the sites because they are maintained by a client. Until now, they have been content with only allowing one site to run at a time, but this is a major hassle, so I need to know if there's a workaround.

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• tomcat dns forwarding to multiple applications

  - by basis vasis

  I recently installed business objects software on tomcat 6. I have 2 domains - domain1 and domain2. This software allows access to two of its applications via these URLS: ADDRESS:http://myservername.domain1:8080/BO/APP1 and ADDRESS:http://myservername.domain1:8080/BO/APP2. Instead of these urls, I would like the end users to access these apps via something like http://bobj.domain2.com:8080/BO/APP1 and http://bobj.domain2.com:8080/BO/APP2. I cannot figure out how to accomplish that. I have looked into the option of http redirect (not good because the destination address shows up in the address bar), domain forwarding (not sure if it would work with multiple applications and forwarding from one domain to another) and also using apache tomcat with mod_jk by using virtual hosts (not sure if it is possible when forwarding from one domain to a sub domain in another domain) ?? please advise as to what would be my best option and how to accomplish. thanks a bunch

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• nginx www.domain.com vs domain.com virtualhost

  - by m33lky

  I have an http block where I include virtual hosts for the different domains hosted on the same server. For each virtual host I do: listen domain.com:80; Now, domain2.com works fine. However, when I do www.domain2.com it shows the page for domain1.com! How to properly configure nginx? Does this have something to do whether www is a CNAME or an A record? Update: It looks like you can do the following: listen 80; server_name domain.com www.domain.com;

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• GF 3.0.1 + Virtual Server: www.myhost.com:8080/projectname-war => www.myhost.com. How?

  - by Harry Pham

  I need to change www.myhost.com:8080/myproject-war to www.myhost.com. This is what I try. In admin console in Glassfish 3.0.1, I create a http-listener-3 with port 9090 and address 0.0.0.0 (I want to have port 80, but got access-denied or some sort). I then create a virtual server call scholar, with Id=scholar, Hosts=${com.sun.aas.hostName}, Network Listeners: http-listener-3, Default Web Module=project#project-war.war(it is the only option from the drop down list since I only deploy 1 app). Then under Applications, I set the virtual server of the application to be scholar. Save and restart. I try localhost:9090, and expecting that it will load my project like as if I type localhost:9090/project-war. But it does not. I already set the Default Web Module, to be the project, why doesnt it load the project by default?

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• How to setup external mail addresses without external autodiscover tries?

  - by Tarnschaf

  We have a little Exchange/Outlook installation here that fetches the mails from our provider with POP3. Now to be able to send emails outside our organisation, I added another SMTP address to the Exchange User: [email protected] (Default / Reply Address) [email protected] Sending email works using the default address. But now there is an error message each time we start Outlook. Outlook tries to autodiscover using autodiscover.ourcompany.com which doesn't exist. Our autodiscover files are placed on our local server. I think all the servers are discovers, because everything works as expected. Everything except the error message on each Outlook start. (The error message is actually because of an invalid certificate but I don't see why Outlook should contact an external host at all!) So how can I solve this? Forcing Autodiscover on every Outlook client to use the local hosts? Or ist there an even better way?

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• Isn't NAT a MUST when a LAN uses rfc 1918 private IPs?

  - by aks

  Isn't NAT a MUST when a LAN uses rfc 1918 private IPs? Can an organization assign its hosts with private IPs and still communicate with the external world without NAT? how can an internal host with a private IP (say 10.1.1.1) communicate with external world without NAT? I mean, how can the reply/response packet from the external world reach the original source as the packet with Dest IP = 10.1.1.1 will get lost as it can not be routed as many organizations can use the same IP. Why doesn't rfc 1918 (Address Allocation for Private Internets) make any mention of NAT?

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• Why is it a bad idea to use multiple NAT layers or is it?

  - by iamrohitbanga

  The computer network of an organization has a NAT with 192.168/16 IP address range. There is a department with a server that has an IP address 192.168.x.y and this server handles hosts of this department with another NAT with the IP address range 172.16/16. Thus there are 2 layers of NAT. Why don't they have subnetting instead. This would allow easy routing. I feel multiple layers of NAT can cause performance losses. Could you please help me compare the two design strategies.

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• Cacti is not monitoring the correct host... How do I change SNMP target?

  - by wil

  I have been handed a Cacti server that monitors a few hosts. I noticed that three of the targets were displaying the exact same data - the cacti machine, machine a and machine b. After doing a bit of digging, I noticed that machine a and machine b had "Local Linux Machine" set under "Host Template". I have since changed the host template to "Generic SNMP-enabled Host", however, all the graphs still only display data from the local cacti machine (Updates every 5 minutes - I changed this yesterday - 12 hours). I can't think what else is wrong and was wondering if anyone knows/can recommend anything?

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• How to use ssl_verify_client=ON on one virtual server and ssl_verify_client=OFF on another?

  - by Alexander Artemenko

  I want to force ssl client verification for on of my virtual hosts. But get "No required SSL certificate was sent" error, trying to GET something from it. Here are my test configs: # defaults ssl_certificate /etc/certs/server.cer; ssl_certificate_key /etc/certs/privkey-server.pem; ssl_client_certificate /etc/certs/allcas.pem; server { listen 1443 ssl; server_name server1.example.com; root /tmp/root/server1; ssl_verify_client off; } server { listen 1443 ssl; server_name server2.example.com; root /tmp/root/server2; ssl_verify_client on; } First server replies with 200 http code, but second returns "400 Bad Request, No required SSL certificate was sent, nginx/1.0.4". Probably, it is implossible to use ssl_verify_client on the same IP? Should I bind these servers to different IPs, will it solve my problem?

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• Snow Leopard connecting to Unbuntu 10.04 through Samba failure -- need help fixing.

  - by Chris Altman

  I have a Ubuntu 10.04 web server. I want to connect to it with my OSX 10.6 machine and Finder. I have installed openSSH and Samba on the Ubuntu machine. In my smb.conf I have a Share Definition: [www] comment = Development Computer WWW path = /var/www writeable = yes browseable = yes allow hosts = 192.168.1. I can connect to the machine through Finder using a non-root user. When I attempt to add files thought Finder I get an "Insufficient Permissions" error. Please help. I am not sure if the issue is in the Samba configuration or OSX 10.6 Thank you

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• Hosting a site on amazon ec2

  - by Khalid Mushtaq

  I have recently bought an amazon ec2 instance. Now I want to host a website. I have googled and found some useful info but there is some confusion in my mind. Suppose domain name is "http://www.example.com" That's what I have done so far. I have configured my domain locally on amazon ec2 instance and it's working fine when I open that url in amazon ec2 instance's browser. I have used http://www.example.com in /etc/hosts file point it to 127.0.0.1 to open locally on instance. I have got one elastic ip address and associated it with the instance. I have changed http://www.example.com A's record with the elastic IP that I have got in above step. Now what should I do? When some user will open my website anywhere in the world, will it get pointed to my instanace's ip address? Have I done proper configurations for website on instance?

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• i am not able to connect to the application hosted on port 80

  - by shiva

  I am trying to access an application that is hosted on port 80. When i try the url from my personal computer , the site is not reachable but the same url on the server( which hosts the application) i am able to access the site. When i disable the firewall then i am able to access the site from my pc. So there is some rule which is blocking this port. How do i determine what windows firewall rule is blocking this port. I have disables IIS as well. Kindly point me in the right direction

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• Daemons die with bus error when their binaries live on NFS

  - by mbac32768

  We have some daemons executing on a number of hosts. The daemon executable images are these very large binaries that are hosted on NFS. When the binaries are updated on the NFS server, the previously running daemons sometimes drop dead with a Bus error. I'm assuming what's happening is the NFS server is replacing the binaries in a way that's invisible to the VFS layer on the NFS clients so they end up loading pages from the updated binary, which of course leads to madness. We tried moving the new binaries into place instead of cp, but that doesn't seem to fix it. I'm considering simply mlock()'ing the binary in the daemon startup script, but surely there's magic NFS options or semantics that we should be abusing. Is there a better way to fix this?

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• IP assignment in a /28 block

  - by mks

  Need help on setting up firewall router. My config is as below: Public static network ID: x.x.x.48/28 gateway: x.x.x.49 available IP for the hosts: x.x.x.52 to 62 gw_eth0 <-- fw_eth0 - fw_eth1 <-- dmz_switch Four servers are connected on dmz_switch (say s1, s2, s3, s4) all have to use public static IP address from the above block. Any recommendation on IP assignment and route setup? Do I need to subnet the above block further or simply use /32 netmask and point-to-point static routes in the above setup?

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