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• Proxy between data centers [closed]

  - by dstarh

  Possible Duplicate: Can IIS be configure to forward request to another web server? We are switching data centers (actually datac-center to EC2 to be specific) and some customers have not yet made DNS changes to point the domains to the new load balancers. We are thinking of leaving the existing servers up and just using a proxy server to forward the request to the new load balancer. Can anyone recommend a good proxy server for doing this I've got squid installed but it seems it's fairly easy to just have a fairly wide open proxy server and we don't want this. I want all requests coming in on port 80 to be sent to port 80 at a specific domain (elastic load balancer) the data center env is windows 2k3 and the EC2 env will all be linux but the ec2 env should be irrelevant

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• Uptime concerns in case of AWS outage

  - by Aditya Patawari

  I am running an Elastic Load Balancer backup by 2 instances in different Availability Zones in US East. I am using Multi-AZ RDS as well. Ideally this should ensure that if one AZ goes down, it should not effect the app because everything is spread across multiple AZs. But the recent AWS outage took the app down for a long time. I am not sure how this can happen. It would be great if someone can point out what went wrong. Major question here I have is how can I avoid this in future? I can setup app servers across different regions or even providers and use DNS for load balancing but what do I do with MySQL? Read Replicas will introduce some lag which I would want to avoid.

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• Subdomain returns error when restarting Apache

  - by xXx

  I try to install a subdomain on my dedicated server. I made a new DNS rules to point my sub domain to the IP of my serv. After reading this Subdomain on apache i tried to add new rules on Apache : NameVirtualHost *:80 <VirtualHost *:80> ServerName tb.mysite.org DocumentRoot /home/mysite/wwww/tb/ <Directory "/home/mysite/wwww/tb/"> AllowOverride All Allow from all </Directory> </VirtualHost> Then i restart Apache but it returns sudo /etc/init.d/apache2 restart * Restarting web server apache2 Warning: DocumentRoot [/home/mysite/wwww/tb/] does not exist [Wed Jun 27 10:32:58 2012] [warn] NameVirtualHost *:80 has no VirtualHosts ... waiting Warning: DocumentRoot [/home/mysite/wwww/tb/] does not exist [Wed Jun 27 10:32:59 2012] [warn] NameVirtualHost *:80 has no VirtualHosts the tb/ folder is existing, don't why Apache can't find it... And it says that NameVirtualHost:80 has no VirtualHosts...

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• can't enable share on clients in my network

  - by nahman

  i installed on my subnet a win 2003 server as the domain controller, with dhcp and dns options too. the clients, win xp pro and and win 2003 server. in my clients when i log in via the domain, i don't have the option to share folders in the netwrok! i want to share folders this way: right lcick on the fodler Properties Sharing Share how can i make it appear? (if i log in to the computer as the administrator i do have this option) p.s. please be specific for how to enable it, thanks a lot :) nahman.

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• Junk host name while using nslookup, How to change it?

  - by Jayachandran

  Hi, My question is regarding the host name mapped to a machine's IP. I am new to Linux, I have a machine to test whether our j2ee based web application runs fine in linux box. we are able to deploy our application and successfully and even able to access the same in that machine. But when I tried accessing it through another machine in the same network, I am not able to access the URL using the hostname specified, instead I am able to access if I provide the ipaddress. I tried putting nslookup MyIP# command to know the name of the ip in the DNS server, where I got some junk value.com; when I tried to access with that name I am able to access the machine. Kindly provide me inputs to change the hostname of this machine in that domain server. Thanks in Advance!! Jay

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• SMTP 25 blocked externally

  - by Jeff

  not sure how to title this question... we run an exchange server with around 80 internal users, all outgoing mail is relayed off a smart host (ISP smtp server) so nothing is actually sent to the world via our server. i wanted to check the server, locally i can telnet to port 25 with no issues and receive the esmtp service ready reply. whenever i do it from an external address (off our local network) i receive unable to connect error 10060. can this cause problems with SPF records, and reverse DNS ? should my exchange server be able to accept smtp requests, requiring authentication before i am able to send from external addresses? if so how... also the exchange server is behind a NAT (asa) device, more than likely thinking that the nat is not configured to route the smtp 25 request to the exchange server.. thanks

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• Redirect subdomain.example.org to somethingelse.com hidden to the user?

  - by moontear

  I'm not knowledgeable at all about C-NAMES, A-RECORDS, name servers and the like, so just bear with me on this one: I want to redirect subdomain.example.org to another domain somethingelse.com. I do own both domains and both domains run on shared hosting. When creating a subdomain, all I can do out-of-the-box is do a HTTP redirect (302, yuck!) or a frame redirect. I also can set the DNS records on one host like nameserver, CNAME - but I would have know clue what I am doing. Please explain to me how routing with nameservers works and how I should (even if not possible with my current host) redirect subdomain.example.org to somethingelse.com with the user-visible URL staying at "subdomain.example.org"

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• Redirect subdomain.example.org to somethingelse.com hidden to the user?

  - by moontear

  I'm not knowledgeable at all about C-NAMES, A-RECORDS, name servers and the like, so just bear with me on this one: I want to redirect subdomain.example.org to another domain somethingelse.com. I do own both domains and both domains run on shared hosting. When creating a subdomain, all I can do out-of-the-box is do a HTTP redirect (302, yuck!) or a frame redirect. I also can set the DNS records on one host like nameserver, CNAME - but I would have know clue what I am doing. Please explain to me how routing with nameservers works and how I should (even if not possible with my current host) redirect subdomain.example.org to somethingelse.com with the user-visible URL staying at "subdomain.example.org"

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• How to retrieve connection details of CheckPoint SSL Network Extender?

  - by amoe

  My workplace uses a Java-based VPN tool named CheckPoint SSL Network Extender. I would like to configure the VPN connection myself using stock OS tools, because I find the applet to be rather unstable. How would I go about getting all of the connection details needed to manually connect to the VPN? My workplace only supports the official client. When I am connected with the Java applet, if I run ipconfig /all I can see that a hidden network connection is created named Check Point Virtual Network Adapter For SSL Network Extender - Packet Scheduler Miniport. I can see the various IP and DNS details there as well. However, because I need to log in to the applet-based tool, I presume I need to export some kind of key in order to use OS tools to configure this. Is this even possible? Answers for any OS are great although I am using Windows XP to test, and also want to use Linux clients.

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• Windows failover cluster - virtual node with multiple Client Access Names

  - by mclaassen

  I recently encountered a customer environment in which they had failover cluster where one of the virtual nodes had more than one 'Client Access Name' (i.e. more than one IP address and DNS name for the single virtual node). Long story short we had to modify our software to deal with this situation, but we want to recreate the situation in house to test it before releasing. I have been unable to locate any information about how or why you would end up with a virtual node that has more than one access name. Does anyone know how I can set up a Windows failover cluster where a virtual node has more than one access name/IP?

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• Cannot access internal network on OSX 10.6.6

  - by cabuki

  Last week, I began having trouble connecting to our internal web servers. Usually, a refresh would take care of it or switching to a different wireless network, but as of yesterday, this wasn't enough. We have an internal DNS server using dnsmasq and a private internal host name (us.lcl). Once I started having more issues with the names not resolving, I tried pinging the server. Using the internal host name (s1.us.lcl), it failed. I tried using the IP address, but that also failed. I have no problems accessing external sites with the exception of it being a bit slower than normal. A reboot yesterday at lunch time after following the instructions here seemed to fix the issue, but when I came into the office this morning, it had stopped working. As of this posting, I cannot ping, ssh or access the web server using the internal host name or ip address. I'm the only one running 10.6 in my office and none of my colleagues has this issue.

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• For very beginning startup: home server or EC2?

  - by StCee

  The micro instance of Amazon EC2 only has ram of 613MB, my laptop got 8GB. And I suppose likewise the processing power of my computer would be better than the micro instance. My question is, what are the considerations in deciding to host yourself or on Amazon EC2, especially for a really baby startup? For example, would network speed be a problem? My computer broadband network is 100Mbs up to 1Gbs. What would Amazon compare to this? My site at these moment would just host some images and perform some php requests. I would probably also use cloudflare but seems it increases the dns lookup time considerably... And of course the overall objective is to make the best user experience.

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• Chrome sending of packets to random destinations upon reconnect/disconnect

  - by f0x

  Noticed an interesting thing whilst debugging one of my websocket applications that Google Chrome will push out 3 http requests upon a network connection status changing; Quite disconcerting and looks almost as if some malware is checking out to a random server. I don't quite understand the why though since they all return a 502 or have no response code at all since the destination does not exist. On Disconnect: Reconnect: I guess the main question is this normal and what the use is; howcome they wouldn't go for a dns lookup that actually exists?

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• Wired and Wireless Network Duplication

  - by Dave

  Howdy! Running into an issue when some of our client's have their laptop's connected via the wired ethernet network aswell as on the WLAN of the same network. There is know issues caused to the end clients.. BUT! Being a Managed Services Engineer i get pretty over the alerts that come through on our reports for machine's with the same hostname on the same network! We are not going to remove this monitoring because it does help a lot with detecting and stopping inferior users and things like that. So basically.. Question is, is there a way in Windows (third party programs welcome) to disable the wireless network when a wired network is connected and operational.. I know that Windows automticaly 'prefers' the wired network, however they are still both connected and therfore there is duplicate hostnames on the same network. Could also have stupid issues with DNS and things like that! Thanks!

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• Correct usage of Windows Server on network?

  - by Hobart Bosworth

  I have two routers, one with dhcp turned on and the other with it off. this is a functioning home network. Now, I am trying to integrate into it a windows server. Should the windows server be doing the dhcp and dns work? And if so, what will this mean for the existing network? Will I need to reconfigure this? I am currently installing server 2003 onto my server machine. It is connected up to the network on the main router with dhcp. Any words of advice?

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• Windows 2008 Server network issues

  - by Snowflow

  I have this one server that just doesn't want to be on the internet It's a new server, a twinblade, the other twin works, but not this one. It can connect fine to everythign else in the LAN, but cannot go out on the net It can be reached by ICMP requests over the net (the nagios server can probe it, but not ping it for instance), but not TCP Everything seems fine both in firewall and machine, i get no issues. Anyone care to help me out where i can start looking, i'm seriously confused. edit: it can ping gateway and through the sonicwall site to site VPN, it\s also able to resolve DNS. the only thing it can`t do is reach anything outside of LAN/VPN

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• Finding a way to enter gmail in Company

  - by stckvrflw1

  Hello all, I am entering network over DNS's of my company. Here my company blocks lots of IP's for reasons like entertainment, sports, music, messaging boards etc. General e-mail is also one of those topics and I can't enter gmail.com. The proxy sites are also blocked in the company and the one's I have found (by spending much afford) are not accepting cookies. Also I am not able to enter the gmail from Igoogle too, this is also blocked. How can I enter gmail ? Thanks.

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• Can't access link in network using fully qualified domain name

  - by user1033715

  I have installed windows server 2003 and configured Domain controller (domain name - xyz.com) and DNS service. for that I have configured fully qualified domain name as server.xyz.com also I have installed apache tomcat with port 8080 on that server and accessed link successfully using "http://localhost:8080", "http://ip address of server:8080", "http://server.xyz.com:8080". but its working for local machine, and when I tried to access it from another machine in same network using "http://ip address of server:8080" its worked for me. but when I tried it using fully qualified domain name i.e. "http://server.xyz.com:8080" it's giving me error, "Could not connect to server.xyz.com" Please guide me getting this setup done. I need to be able to access this link "http://ip address of server:8080" as "http://server.xyz.com:8080" outside my network Any suggestion are highly appreciated..

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• Cisco 5505 VPN RDP not working

  - by user1058275

  I am in dire straights over here. We just changed our LAN from a 192.168.1.0 to a 172.16.4.0. We run Active Directory in our environment and our gateway is a Cisco 5505 ASA. Since the change, our clients can VPN in and make a connection but cannot RDP to any machines that they need to get to on the LAN that they VPN into. I updated the VPN address pool and DNS servers but I'm not sure what else I need to configure. I can send anything you need as I am not an expert and I really, really appreciate the help!

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• Why would one server be sending DUP ACK packets to one PC, which is responding with HTTP RST packets?

  - by IronicMuffin

  I'm not a network profressional, so please excuse any wrong language. I was debugging why my DNS traffic was a constant 160Kbps on our corporate network. I opened up a wireshark trace, and I see one PC of a coworker broadcasting HTTP [RST] packets to one of our DMZ servers at the rate of 1000 a second. He restarted his machine, and as soon as it went offline, the server started broadcasting [DUP] [ACK] packets, until he came back online. It then resumed the HTTP [RST] packets. Apparently this server has been doing this kind of behavior since it went live. I believe it did this with a printer and an access point as well. Can anyone explain why this behavior is occurring? Any solutions? The initial research was done because there have been "bandwidth issues" and I wonder if this is contributing.

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• Access Domain over Wireless

  - by William

  I have an active directory server and all hard wired clients connect perfectly fine. However any wireless clients do not recognize that they are connected to the domain, despite the dns server being appropriately set to the domain controller for both wired and wireless connections. Also - both wired and wireless clients are on the same subnet. I am using a Verizon food actiontec router. What am I missing? For instance, this is the same computer connected first via an Ethernet cable and second via the wireless.

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• Spammers sending out from an inactive domain

  - by YesIWillFixYourEmailSigh

  We have a shared hosting service running QMail and Plesk. One of our inactive clients was left active in the system by mistake, and spammers found their very weak passwords and sent out a massive barrage of messages before we caught the problem and shut off the services for that domain. My question is this: How did they get access to that domain in the first place? The client is long-gone and the domain/DNS is not pointing at our server at all, and neither is the MX record. So how were they able to find that domain and exploit it when nothing on the "outside" was pointing to it?

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• Reverse proxy - how should it be done?

  - by Thomas M.

  I have a currently running server with Apache that is working great! However, I want to buy a VPS and use that as a proxy between the user and the "old" server. So the new server's only job is actually to just forward the traffic from the VPS to the old Apache server. How can I achieve this the best way? I've read something about nginx proxy, but don't know if that's what I should use? The IDEAL way (for me) would be to now even touch the running server. I just want to setup the VPS as proxy, forward the DNS to the proxy instead, and let the proxy take over the connection to the primary server. Is that possible? I would really like to hear your opinions about this, and how you would do this (would be happy if you could link me to some tutorial)! :) The VPS is running CentOS and the running/primary is running Debian. Thanks in advance.

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• Can i use a Windows 2008 r2 Cluster for file redundancy

  - by JERiv

  I'm researching a sever clustering architecture as a redundancy and backup solution for a client, and something that isn't made clear is whether or not i can use server clustering to replace a file server with backup solution. Forgive my Elementary understanding of server clustering but supposing: 2 Sites (NJ, CA) Identical Servers at each site setup as a Remote Site Cluster nodes with Windows Enterprise server 2008 r2 Services: File, Terminal, AD, and maybe DNS Will the following will be true: Files (including data drives) will be synced between the two servers eliminating the need for third party backup/mirroring software to sync/backup files. Also supposing i use roaming profiles w/ folder redirection; How will client computer in the WAN access their data through the cluster (i.e. will they automatically choose the best route)

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• /etc/hosts file for a multi-homed, multi-domain machine?

  - by threecheeseopera

  I have a server (debian) with two network interfaces that I would like to host multiple services and domains on; it is not entirely clear to me how the hosts file should be set up. Example: eth0, bound to WAN interface 1.2.3.4: mail.example.com www.example.com eth0:1, bound to WAN interface 1.2.3.5: www.other-domain.com eth1, bound to LAN 192.168.1.123: some-clever-hostname What should my hosts file look like? (including localhost,localhost.localdomain, etc.) Should I use DNS for some of these entries? Which ones? Thanks!

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