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• Dhcp clients fail after successful import of server to new machine

  - by Tathagata

  I transfered the configs of a dhcp server from one server to another both running Windows Server 2003 R2 following http [://] support.microsoft.com/kb/325473. The new server has a statically configured ip(outside the scope) like the old one. Stopped the server on the old, and started up in the new server (authorized too) - but when I ipconfig /renew from a client its network interface fails with all 0.0.0.0 (or 169...*). I read somewhere I need to reconcile the scope to sync the new registry values ('ll try this tomorrow). What other troubleshooting steps can I take other than these (which didn't help)? Things work fine when the old server resurrects and the new one is taken down. The new server showed there was no requests for offer.

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• One vs. many domain user accounts in a server farm

  - by mjustin

  We are in a migration process of a group of related computers (Intranet servers, SQL, application servers of one application) to a new domain. In the past we used one domain user account for every computer (web1, web2, appserver1, appserver2, sql1, sqlbackup ...) to access central Windows resources like network shares. Every computer also has a local user account with the same name. I am not sure if this is necessary, or if it would be easier to configure and maintain to use one domain user account. Are there key advantages / disadvantages of having one single user account vs. dedicated accounts per computer for this group of background servers? If I am not wrong, one advantage besides easier administration of the user account could be that moving installed applications and services around between the computers does not require a check of the access rights anymore. (Except where IP addresses or ports are used)

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• How do I configure networking on CentOS 6 running on hyper-v?

  - by LonelyLonelyNetworkN00b

  I'm not using legacy adapters, and i've installed Linux Integration Components 3.2. THe problem i'm facing is that the command 'setup' or 'system-config-network' doesn't list any network interfaces. If i run ifconfig -a i can see both the network cards i've attached. By setting a ip using ifconfig i can get network connectivity. The problem is that it's not persistent after a reboot. I'm a 100% centos newbie, but I figure it has something to do with that the centos installer couldn't see the NICs on install. How can I fix this?

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• Sorting IPv4 Addresses

  - by Kumba

  So I've run into a quandary on sorting IPv4 addresses, and didn't know if there was a set rule in some obscure networking document. Do I do a straight sort on the raw address only (such as converting the IP address to a 32bit number and then sorting), do I factor in the CIDR via some mathematical formula, do I sort via the CIDR only (as if I'm comparing the network size and not the addresses directly)? I.e., normal math, we'd do something like -1 < 0 < 1 to denote the order of precedence. Given say, 10.1.0.0/16, 172.16.0.0/12, 192.168.1.0/24, and 192.168.1.42, what would be the order of precedence?

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• SSL Certificate for local web server

  - by Firefly

  Is it at all possible to create a self-signed certificate for use on multiple machines on a local network which would stop the browser complaining it is not a trusted site? We have a product which is basically a computer running lighttpd to serve a web interface for configuring the computer (sort of how a router has a web interface). There can also be many of these machines running on the same network with dynamic IP's. What I basically want to do is enable SSL for extra security but I don't want people who are on the local network to be given a browser warning about the certificate not being trusted. Is this at all possible?

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• No internet connection for some programmes after installing ad hoc wireless network

  - by Michael

  After installing a wireless network (through the program iPhoneModem) several programmes have stopped working when connected to the Internet using another wireless connection. Working programmes: Firefox (browser) uTorrent (p2p) FileZilla (ftp) etc. Programmes that are not working: Chrome (browser) Digsby (IM client) etc. I'm running Windows 7. I have tried to disable Windows Firewall entirely as well as AVG anti virus, with no effect. I've tried to run the FixIt program from Microsoft adressing a corrupt TCP/IP stack. This too had no effect. Any suggestions?

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• client subscribed to a multicast group not receiving data

  - by Abruzzo Forte e Gentile

  I have a network that was setup for multicast traffic IN Machine A there is a server application generating multi-cast traffic. I have also different clients subscribing to that mulicast traffic -some client are in the same machine A -other clients are in machine B,C,D # Address I am using IP : 239.193.0.21 PORT: 20401 I don't know why but the client in machine A , even if they join the group, don't receive any data while (and this is the funny part) machine B,C and D receive everything. Checking with Wirshark I can see that the UDP traffic flow is there in Machine A. I am using LInux/Red-Hat Enterprise 6.2 What should I look at? Any setting in the os? Firewall or what?

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• Session persistence between multiple Rails / Unicorn servers with Redis as session_store on AWS

  - by d_ethier

  I've got 2 nginx EC2 instances pointing to 2 Unicorn EC2 instances in a round robin load balanced configuration. The two nginx instances are being the Elastic Load Balancer. Both Unicorn instances have a Redis session_store configured which is in a master/slave configuration with an Elastic IP attached to the master. I've tried configuring the session stickiness on the load balancer, but sessions are lost on each page refresh. I'm using the redis-store gem for the session_store configuration and redis support. Anyone have any ideas as to why this is not working?

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• Setting up nameserver / DNS with IIS 7 / Windows Server 2008

  - by Mike

  I recently set up my own server; I've got my fixed IP working perfectly publicly. I've got 5 domains that I want pointed at this server. I'm completely lost on what to do: I was told I need to set up a DNS / nameserver on the server via IIS7 / Windows DNS, because I want to host the domains on the server (domains via godaddy). Can anyone help on what to do? Where do I point the domains, what do I set in the DNS? I've searched and searched, and found no tutorials that worked. Thanks!

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• shut down FTP from IIS 6 after <X> failed login attempts

  - by Justin C

  Is there a setting in IIS 6 to turn an FTP site off after a specified number of failed login attempts? It has already been documented on this site that a Windows server sitting on a static IP address can record tens of thousands of failed login attempts a month. One server I maintain has had tens of thousands of attempts made against the FTP port. I have solid passwords in place, so I am not overly concerned. I rarely have to use the FTP, so for the most part I turn it on and off as I need it. Sometimes though I forget to turn it off when I am done, only to find the next day that my EventLog is full of audit failures. I would want to set a high number, in case I just messed up the password. Something like if 50 failed login attempts happen, just turn off the FTP site. Then if I need it later I can just start it again.

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• DNS Spoofing and Xampp as a proxy, how to configure it?

  - by Angelo

  I have a server running Apache with mod_proxy, a module to use my localhost as a proxy server. When somebody on the same LAN visits my server (my localhost through my lan ip), he/she can see only the .html page loaded into my server. Due to DNS Spoofing restrictions on the client, if he/she clicks on a link that refers to something not on my server, Apache says correctly "Object not found", because the client cannot request the page from the Internet (remember, the DNS is spoofed to my localhost). The question is: how to configure Apache to grab the page in place of the client?

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• pf not execute udp port specific block rule

  - by seaquest

  The traffic I want to block can be sniffed as below with tcpdump: 19:16:22.391164 IP 95.95.95.95.2036 > 10.10.10.10.443: UDP, length 8192 So I wanted to write a rule block any udp destination port 443 traffic. block drop quick on igb3 inet proto udp to any port 443 Traffic does not match and does not blocked. However, It matches and blocks if I write rule as below: block drop quick on igb3 inet proto udp to 10.10.10.10 Do you have any remarks? I am using pf in Freebsd.

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• Vmware server: Browser does not load user interface

  - by matnagel

  I have the latest vmware server isntalled on ubuntu 8.04 lts 64 bit. I access the user interface over this url, which matches my ip and port settings: https://10.1.1.99:11222/ui Sometimes it works in fierofox 3.6, but sometimes not. Same in Google Chrome. When it does not work, what happens is that the cert is checked, the browser is loading something, but the result is a white page. Sometimes the favicon of vmware (blue with 3 squares) appears, but only the white page. And sometimes it works. I reload many times, most of the time the whit epage appears again. On some days I succeed. But on many days not. I can give more info if someone tells me what is needed. Please help, we need this badly.

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• How to setup dhcp3-server to advertise the DNS server the server itself has got from DHCP?

  - by Ivan

  The Ubuntu 10.04 server has eth0 Internet interface configured by means of an ISP's DHCP. At the same time the server has static eth0 LAN interface to which it provides masquerading (NAT) and LAN-internal DHCP service (dhcp3-server). As far as I've understood the manual, I had to hardcode DNS servers to advertise through LAN DHCP with option domain-name-servers in dhcpd.conf. But what if the ISP changes his DNS server IP silently (we use a SOHO-class ISP, so this won't surprise me much)? Can I configure dhcpd to advertise the DNS server the server uses itself, the one gotten by its DHCP client mechanism?

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• Is mumble safe (privacy wise)?

  - by AnonymousLurker

  When chatting on IRC, it is possible to leak data like OS, CPU type if the IRC client happens to leak it in VERSION string. Anybody doing /CTCP VERSION can see it. Same about timezone (/CTCP TIME). This can be mitigated by turning replies to CTCP queries off. Also, IP address is leaked to others (/whois nickname will show it if it's not cloaked). By analogy, does the mumble client expose such sensitive data to others that are connected to the same server? If it does, what are the ways to mitigate this?

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• Enabling SFTP Access within PLESK

  - by spelley

  I have a client who wants to ensure his upload is secure, so we are trying to enable SFTP for him on our Linux PLESK server. I have enabled SSH access to bin/bash for FTP accounts, and created a new user. When I attempt to SFTP using either the IP address or the domain name, this is the error FileZilla is giving me: Error: Authentication failed. Error: Critical error Error: Could not connect to server Here is some basic information regarding the server: Operating system Linux 2.6.24.5-20080421a Plesk Control Panel version psa v8.6.0_build86080930.03 os_CentOS 5 I had read in some places that I should reboot the SSH Service in Server - Services, however, there is no SSH Service within the list. I'm not really a server guy so it's quite possible I'm missing something obvious. Thanks for any help that you guys can provide!

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• Using AWS SES with Sendmail

  - by Abs

  I am trying to send mail via AWS SES uisng Sendmail. I have Sendmail version 8.14.4 installed and I followed the first section of this useful tutorial by Amazon. However, I get this: root@:/etc/mail# echo "Subject: test" | sendmail -v [email protected] [email protected]... Connecting to [127.0.0.1] via relay... [email protected]... Deferred: Connection timed out with [127.0.0.1] Can anyone help me get this working? The logs have the following: Dec 14 10:35:21 ip-10-xx-xx-181 sm-msp-queue[17910]: qBE8K1Lu016411: to=root, delay=00:21:24, xdelay=00:06:19, mailer=relay, pri=121806, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1]

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• Virtual Network Printer

  - by user113720

  I'm pretty new to Microsoft Servers so don't blame me if the question isn't that smart [I'm a Unix guy]. I need to install a Virtual Printer of a Microsoft Server 2008 r2. The requirements are: The printer must print on a file {whatever file... txt or pdf } The printer must run on a server The printer must accept plaintext from a specific IP:port The connection between the device that prints and the server is a local network I've tried to install a virtual printer, but I cannot specify the constraint about the socket from which receive data to print. Thank you so much

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• Thunderbird is unable to find server in DHCP controlled network.

  - by Skizz

  I have a network which consists of linux server and a combination of WinXP, Win7 and linux clients. All the systems are given dynamic IP addresses by the router which connects them all together. The server hosts an IMAP mail server. On Win7 and WinXP Thunderbird can access the IMAP server without any problems. On the linux client, using the same IMAP parameters, Thunderbird is unable to connect to the server. How do I get Thunderbird to find the server? I'm not sure if this is a linux system configuration problem or a Thunderbird issue. Additional note: The linux client is running Gnome, the server has a series of Samba shares defined. In the client, doing Places-Connect to Server and selecting Windows Share and specifying the server name, the Samba share is mounted OK.

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• Google Analytics unexplained spike

  - by Dianne

  My client's Google Analytics has had a spike everyday from May 6th (from 0 - 100.) This is in a city that he is not optimized for and does very little business in. The hits are coming in direct to the website. My client is concerned that it has something to do with competition using his site as a price shopping device. I can't view the ip to see where they are coming from and his site is not built in PHP so the work around doesn't work here. Any thoughts? Could it be a "referring site" situation and if so is there a way for me to find out what the referring site is?

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• Accesing internet with Host-Only network VirtualBox

  - by Bibo

  I have two VMs in my VirtualBox. Both are FreeBSD and should communicate between each other. I have created network with DHCP enabled and set like this: Server Address 10.10.10.1 Server Mask 255.255.255.0 Lower Address Bound 10.10.10.100 Upper Address Bound 10.10.10.200 My VMs are pinging each other and getting right ip adress. This is what I must have and can´t change. Now I want to access internet from one VM and I found that I must use two network cards but I don´t know how to set the second one. I am new with VirtualBox and this stuff so if you count with this in you answer I would appreciate that. And I have Windows 8 as host system if it´s matter.

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• How to troubleshoot slow powerconnect 62xx management interface

  - by Hannes

  Our Dell Powerconnect 62xx switches have a very high packetloss on the management interface. I presume this is caused by a new appliance which uses multicast for communication but I am not sure. Our network setup is following: servers a - Dell PC6248 | servers b - Dell PC6248 |- juniper core router servers c - Dell PC6248 | What we see is that the multicast traffic arrives at all servers (but only the servers b use the multicast) and I fear that this multicast traffic floods the switch management interface. The switches' management interfaces are reachable via vlan101, all other traffic is sent over other vlans. When I tcpdump on one of the 2 servers with a vlan 101 ip address, I only get a few arp requests but almost nothing. When I try to ping between these 2 servers, it works like a charm. I would like to know what a good way is to troubleshoot this problem and maybe help me understand what is going wrong on that subnet.

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• “yourdomain/start is not the same thing as yourIP/start in Apache”

  - by user1883050

  Let's say you're trying to get a CMS up and going. And say you're supposed to find a Start Page at "www.yourdomain.com/start" But you don't have a domain name yet. You only have an IP address (yourIPaddress). Apache is visibly running at yourIPaddress. So you look in "yourIPaddress/start" And you don't find anything there, just a 404 page. And the person who installed it for you tells you: "In Apache, yourdomain/start is not the same thing as yourIP/start. Please read up on Apache server configuration to figure this out. And that's all the help I can give." My question is: what concepts (re: Apache configuration) should I read up on so that I can find the start page? Thoughts?

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• VNC unattended Server (No user Interaction)

  - by Louis van Tonder

  I worked on a proof on concept a while ago.... whereby I managed to get VNC going in full "unattended" mode... I.e. The VNC Server dials into the viewer... which is running in Listening mode. The same concept of how single click works, but without the user interaction. I cant seem to locate my source files for this concept I worked on... although I have found my shortcut that worked on the Viewer side to listen. "C:\Program Files\UltraVNC\vncviewer.exe" -listen 5007 /noauto /256colors I can not however remember/locate my demo of what the server is doing.... how to configure it. If I remember correctly, the server was also started with command line params that "dialed" into a remote IP/port, that the viewer is listening on. Any ideas? Thanks

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• How to broadcast a command on Windows

  - by Xiao Jia

  I am going to frequently deploy different versions of a program on a cluster of Windows machines (mostly Windows XP), so I am willing to use a command-line broadcasting tool (either built-in or 3rd-party) to (1) download a file from some URL, and (2) execute the same command, on all the machines. I googled for a very long time but got nothing related to my goal. (Only pages about broadcasting a message, broadcasting ping, or programmatically broadcast via TCP/IP, etc.) Are there any tool for this purpose? Or is it possible to do it pragmatically (without installing extra client programs on those machines)?

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