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• UDP Reverse Proxy

  - by user180195

  I have found a way to make reverse-proxy to an external IP. Here is how someone making a request will see it's request being passed: Clients sends request Request reaches the Datacenter one in some place That datacenter, acting as a reverse proxy will redirect the same exact request to another datacenter. The datacenter will then process the request Although, this only works with TCP/HTTP (Looking currently at HaProxy). I am hosting game servers at the other datacenter (where the proxy is not) that are using UDP protocol. Do you know how can I setup a reverse proxy using the UDP protocol.

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• Email error 'Default email client is not properly installed' after installing Bugzilla 3.6.3 on Windows Home Server 2011

  - by Brian Frost

  I have been using Bugzilla fine on the older 32-bit Windows Home Server and I have now started a migration to the newer Windows Home Server 2011 with a new machine and a fresh Bugzilla install of 3.6.3. All goes well until I try to check out the email action and I get 'Could not perform this operation because the defaulty mail client in not properly installed. Is this a security /firewall issue? I dont know enough about servers to know what to look for, so any help will be gratefully appreciated. Thanks.

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• Is it still "wrong" to require TLS on incoming SMTP messages

  - by jackweirdy

  According to the STARTTLS Spec Section 5: A publicly-referenced SMTP server MUST NOT require use of the STARTTLS extension in order to deliver mail locally. This rule prevents the STARTTLS extension from damaging the interoperability of the Internet's SMTP infrastructure. A publicly-referenced SMTP server is an SMTP server which runs on port 25 of an Internet host listed in the MX record (or A record if an MX record is not present) for the domain name on the right hand side of an Internet mail address. However, this spec was written in 1999, and considering it's 2014, I'd expect most SMTP clients, servers, and relays to have some kind of implementation of STARTTLS. How much email can I expect to lose if I require TLS for incoming messages?

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• File replication among EC2 instances

  - by Peuge

  I am pretty new to AWS so please excuse my ignorance. We are wanting to have a setup whereby we have a SQL DB instance + web server instance. However we would like the Web server to sit behind an ELB thus allowing us to use Autoscaling. My question however is how to we replicate the web app across instances? Say for example we have two web servers running and we need to make a critical update to the web app, ultimately we would only want to upload to one instance and not both. Is it even best practice to store your web app on the instance or are there better ways to store and share the app between instances?

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• How to use public-key ssh authentication

  - by Poma

  I have 2 ubuntu 12.04 (beta) servers (node1 and node2) and want to establish passwordless root access between them. Other users should not have access to other boxes. Also note that ssh default port is changed to 220. Here's what I did: sudo -i cd /root/.ssh ssh-keygen -t rsa # with default name and empty password cat id_rsa.pub > authorized_keys then copied id_rsa & id_rsa.pub to node2 and added id_rsa.pub to authorized_keys. Both hosts have the same /root/.ssh/config file: Host node1 Hostname 1.2.3.4 Port 220 IdentityFile /root/.ssh/id_rsa Host node2 Hostname 5.6.7.8 Port 220 IdentityFile /root/.ssh/id_rsa Now the problem is that when I type ssh node2 it asks me for password. What may be the problem?

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• Motherboard rejects identical hard drive, one works the other doesn't

  - by Payson Welch

  I have an interesting situation. I have a Dell XS23-SB server that has four blades in it. The blades use Supermicro X7DWT motherboards, and interface with the sata drives through a backplane. I took two identical drives from a raid 0 enclosure that came from the factory (GDrive), one works on all four servers, the other does not. I verified that they both work by plugging them into a hard drive cradle. This behavior can be repeated with other drives, some drives work and some don't. However when i test them, they ALL work on my PC. What could cause this?

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• University Assignment: Datacenter/Networking Infrastructure for Hosting Company [closed]

  - by TCB13

  My university assigned me to theorizing a data center for an Web Hosting company. The company should provide the following services: Shared WebHosting; Dedicated Servers; VPS (Virtual Private Server); The bandwith (as resquested) is limited to 10 Gbps. Is there any good book / other info I can read (max 100 pages) about how to design a good data center for hosting, what are the best practices and what should be done from a (logical) network perspective, what security policies should be implemented and how the data center should be built (physically)? Thank you ;)

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• Can't access dfs namespace over vpn

  - by cpf

  Hi Serverfault, I've recently configured 2 servers in AD on the same domain level. They are physically separated and permanently connected through a site-to-site vpn for dfs replication. All well, but when users connect to either site through vpn (from home e.g.) they can't use the domain level method: \\domain.com\data Internally this works perfectly, resolving domain.com when connected through vpn gets the correct IP. I've tried Google to figure things out. What I was able to find was that more people have this issue, no real solution found though. Can anyone explain why this is happening? Especially a solution would be really helpful! Thanks in advance.

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• MDaemon vs Exchange (2007-2010). Which way should we choose ?

  - by Deniz

  We are at the verge of a mail server decision. We do currently use 2 mail servers : MDaemon 10 and Exchange 2003. We are planning to use a company and customer wide one point solution. Our main candidates are MDaemon 11 and Exchange 2007 or 2010. We would like to learn other users experiences on those solutions. The server-side experiences, the user-side experiences , TCO, support options etc. And if there where other solutions (maybe MDaemon 11 + Exchange or anything else) you could suggest ?

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• How are my DNS entries safe in a shared hosting environment?

  - by Jake

  I'm trying to understand how DNS works in a shared hosting environment. I went to my registrar and set my name servers to my host's ns1.foo.com and ns2.foo.com. I'm using a cloud hosting provider who has a web portal where I can set my DNS entries. However I am confused by the lack of security. when I entered in the entries for my domain there was never any step to prove that I actually own that domain. What is to stop somebody else on the same hosting service (a nasty neighbor) from writing over my DNS entries and pointing my traffic to their server instead?

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• vsFTPd and iptables - how to configure them in CentOS 5.5?

  - by Vincenzo

  I've installed vsFTPd in CentOS 5.5, on TWO servers, and added this rule to their iptable-s: -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT Looks like this is not enough, since when I'm trying to upload a file from one server to another, I'm getting this result (IP address is masked): # ftp 99.99.99.99 Connected to …com (99.99.99.99). 220 (vsFTPd 2.0.5) Name (99.99.99.99:root): vinny 331 Please specify the password. Password: 230 Login successful. Remote system type is UNIX. Using binary mode to transfer files. ftp> ls 227 Entering Passive Mode (99,99,99,99,107,74) ftp: connect: No route to host I've found a few articles in the net about the second rule I have to add to iptables, but I didn't find the right syntax for it. Could you please help?

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• how to design network for connectivity between private and corporate LANs?

  - by maruti

  there is a bunch of servers connected to shared storage in a private LAN (10.x.x.x). this privateLAN is managed by a windows server (DHCP, DNS and directory services) these hosts need to be from outside of the datacenter Eg. Remote desktop. can the NIC2 on each of the hosts be connected to the other public LAN (compromising speed or security? what are improtant considerations: additional hardware? like switches? routing&DNS software? currently available hardware : Dell Powerconnect 6224 switch .... planning this for storage network. software: windows 2003 server for DHCP, DNS, A/D ? would it be more flexible to use Linux distributions like IPCOP, Untangle etc? all that I am looking for is good isolation between private and other networks, avoid DHCP, DNS, AD clashes.

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• Windows server 2003 mapping home drive wrong

  - by Sandman2010

  hey all, first question... we have around 30 servers in an Active Directory environment with 600 student computers and 100 staff desktops with XP SP2/3, the win server 2003 has the staff home drives on a NAS and in the last few days after some server updates is now mapping home drives to the \servername\home instead of \severname\home\%username%, its simple to re map the network drive but is annoying. we dont use login script to map home drive but use a VB script for other network drives and if we add the home drive mapping to that it works, but shouldnt the profile option in users AD account map that correctly? which do you all recommend, AD profile mapping or VB Script mapping Home drives? thanks Steven

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• Powershell SQL query--connection string

  - by sean

  I am trying to query several different SQL servers and run a command on each of them. I am unable to get the connection string right. Code, below. I receive the following error:Login failed. The login is from an untrusted domain and cannot be used with Windows authentication. I thought if I passed it the credentials it wouldn't care about the domain. How do I get around this? Thanks in advance. $serverList = @(Get-Content "c:\AllServers.txt") $query = "SELECT COUNT(thing) AS [RowCount] FROM My_table" $Database = "My_DB" # Read a file foreach ( $svr in $serverList ) { $conn=new-object System.Data.SqlClient.SQLConnection $ConnectionString = "Server={0};Database={1};User ID=sa;Password=Password;Integrated Security=True" -f $svr, $Database $conn.ConnectionString=$ConnectionString $conn.Open() $cmd=new-object system.Data.SqlClient.SqlCommand($Query,$conn) $conn.Close() }

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• Apply Group Policy to Remote Desktop Services users but not when they log on to their local system

  - by Kevin Murray

  Running Windows Server 2008 Service Pack 2 with Remote Desktop Services role. I want to hide the servers drives using a GPO, but not the users local drives when they are logged on to their local system. Using a GPO, I went to "User Configuration - Policies - Administrative Template - Windows Components - Windows Explorer" and enabled "Hide these specified drives in My Computer" and "Prevent access to drives from My Computer" and in both used "Restrict all drives". Then under "Security Filtering" for the GPO, I restricted it to the system running Remote Desktop Services and the specific users who will be using RDS. I then applied the GPO to our domain and it worked a little too well. Not only was I successful in getting the GPO to work for RDS users, but it also affected those same users at their local systems as well. I've tried everything I can think of, but can't figure out how to apply this just to the RDS but not at their local system. What am I missing?

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• ISPs with good upload speeds? [closed]

  - by Josh Comley

  I am a web developer, and I spend most of my time not waiting for downloads but waiting for my latest build of a website to publish to a test site. I use the excellent BeyondCompare to ensure I only upload what I need to upload. But still, if a 2MB C# DLL has changed, so be it. And I must wait. At work we host our own servers and have a dedicated line, so for 8.5 hours of my day I have blistering upload speeds across the web, which is nice. At home however, it's a different story. I am with Virgin Media on their XL internet package (I think). I think that means I get 256Kb upload and 20Mb download. So I have began to wonder - are there any ISPs in the UK with good upload speeds? If you know of any for other countries, do post for other's sake, but please specify which country your post is relevant to.

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• How do large companies handle software updates for users without administrative rights?

  - by CT

  I just started working for a small-medium size company doing IT support. Maybe 150 or less users. Right now every user has administrative rights to their own machine. This allows them to install updates or whatever else they would like to. I'm tired of getting on user's machines that are bloated with crap they put on themselves. So my first thought would be to take away administrative rights to their computer. This would also have other advantages such as preventing a lot of drive-by malware on the web etc. The problem arises that users are unable to install updates. (Even though I find most ignore these anyway) How do large companies handle software updates on all client machines? EDIT: Windows environment. Most servers are Windows Server 2003 Enterprise. Clients are all Windows. Win XP, Vista, and 7.

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• Recommended resource to understand Internet conventions IPs, CNAMES, *, MX etc

  - by Petras

  I am a programmer who has been creating websites for many years in shared hosting environments. To make the website live, I logged into where the domain was hosted and updated the name servers. Sometimes I didn’t want POP email so I changed an A record. I never really understood what this meant but it worked. Now we have a dedicated server and I have to fill out all this to make it live: Plus I was told I had to complete zones at my domain host: I would really like to know what all this means. What is a * record What is an @ How does the internet work regarding all these conventions? Is there a good approachable book on this topic?

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• nginx proxy pass redirect through load balancer

  - by Brian

  I have several backend webservers that are load-balanced using LVS. These machines have only internal non-routable IPs on them. The load-balancer is the only machine with an external IP. This setup works great. I would like to add another webserver for image serving, but it will not be part of the load-balanced pool. Is it possible to proxy pass from the load-balanced web servers to the image server and have the response redirected to the client? Client--external LB--internal web server--internal image server I've gotten proxy pass working when I remove the LB from the equation, but no luck when trying to use it.

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• DNS Replication issue

  - by BillN

  We host the DNS for our domain. Two weeks ago, the developer requested that we setup a new zone 'dev.ourdomain.com' and place two host records in it my.dev.ourdomain.com and admin.dev.ourdomain.com. We added the zone to our DNS and added A records for the host. Now a week later, some DNS servers like google (8.8.8.8) and gtei (4.2.2.2) will resolve the hosts, but others like OpenDNS (208.67.222.222 ) and ATT Uverse (68.94.156.1) cannot resolve it. Any Ideas?

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• Windows 8.1 killed my wifi

  - by char1es

  Was running Windows 8 on a Lenovo G780 and updated to windows 8.1 Wifi does not work anymore, i always receive a dns server not responding error. I have tried using public dns servers from Google but with still no results. I've restarted my router with no results. All other devices on my network are having no trouble at all. I've tried updating the wireless driver but the manufacturers website claims that the Win8.1 driver should be updated with the update from windows. So i cant find a wireless driver... Anyone else having this error and does anyone have any ideas on how to fix it?? EDIT: here are the driver details: Broadcom 802.11n Network Adapter Provider: Microsoft Driver Date: 2013-05-31 Driver Version: 6.30.223.102 Digital Signer: Microsoft Windows Thanks

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• How to tell httpd to preserve the proxied error message?

  - by ZNK - M

  I have an httpd server proxying the requests to 2 different tomcat servers. One of my server handles the authentication and returns a specific http error code 521 when the user already have a running session. My issue is httpd automatically maps this 521 error code to a 500 (internal server error) and then my client can not handle it properly. I have tried to disable ProxyErrorOverride, to remove the /error/HTTP_INTERNAL_SERVER_ERROR.html.var but it does not changes anything. How can I ask httpd to not change anything to the proxied message? <IfModule proxy_module> ProxyPass /context1 http://127.0.0.1:8001/context1 ProxyPass /context2 http://127.0.0.1:8002/context2 ProxyPreserveHost Off ProxyErrorOverride Off </IfModule> Thanks in advance httpd 2.2.22 (Win32) mod_ssl tomcat 7.25 windows 7 64-bits

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• Reverse proxy using hop and RDP

  - by Sergei

  I am trying to connect from Vista to XP using RDP via reverse proxy using putty and an intermidiate host. There are myriad articles on the internet how to do it using vnc, ssh servers, winsshd, etc, but I can't find anything that helps me in this specific case. What I have: Windows XP host behind the firewall - 'destination' linux host running ssh on the internet - 'intermediate' windows host behind the firewall - 'source' All I want to do is open reverse tunnel from destination to intermidiate and use this tunnel for connecting back from the source. That should be simple to setup, however I just cannot make it. This is what I do: On 'destination', open putty session, create tunnel to 'intermediate' using following settings: source port 3389, destination is 'source:33389', direction is local On 'source', open putty session, create tunnel to 'intermediate'using following settings: source port 33389, destination is 'destination:33389', direction is local Finally, on source, open termnal services client and connect it to localhost:33389.Unfortunately it seems like packets do go somewhere but eventually client times out. Am I totally misunderstanding the concept? Please help!

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• Should I quit using Ifconfig?

  - by Zhen

  With the servers that mount Infiniband cards, when I use the ifconfig command I have the warning: Ifconfig uses the ioctl access method to get the full address information, which limits hardware addresses to 8 bytes. Because Infiniband address has 20 bytes, only the first 8 bytes are displayed correctly. Ifconfig is obsolete! For replacement check ip. Should I quit using ifconfig? It is deprecated in favor of ip command? Or it will be update in the near future.

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• Linux-Vserver: How to do upgrade Debian 5.0 to 6.0 on vservers and main machine?

  - by Bartosz Kowalczyk

  I have server with debian lenny. I installed vserver on this server a few years ago. Summary I have 5 guest of vservers and main system, now. Each guest is debian lenny. Now, I'm wanting upgrade from lenny to squeezy on this servers (each Vservers and main machine). Do you do it? I should upgrade as usually system ? First I should upgrade every vserver next main machines and I have to do reset all machines and vservers? Please, advise me how to do it ?

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