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exim sending mail to wrong mail server

- by Chris Bull

I have recently taken over management of a server running centos and whm. It has several websites and domains running under reseller accounts. Email has always been on a server at our actual office. I have recently changed our email from our local email server to gapps for business (our local email server was pretty archaic). However, when any email is sent from the web server (such as wordpress etc) to our domain - it still routes it to the IP of our old email server. I am not very familiar with WHM or exim so don't really know how to address this. Email to other domains works fine and the gapps is working perfectly. Any help is much appreciated.

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Can't get iptables firewall working correctly

- by Jay

I'm setting up a new Centos 5.6 system and can't get my iptables firewall to work correctly. it won't let me use SSH through it. I'm new to Centos but not to Linux or iptables. I've been removing things until I have isolated the problem. I set up the firewall with a default ACCEPT rule for the INPUT chain. I can connect through to the server fine. If I change the command to only allow traffic from the interface connecting to my trusted network it stops working. Working: iptables -A INPUT -s 0/0 -d 0/0 -j ACCEPT Failing: iptables -A INPUT -i eth0 -s 0/0 -d 0/0 -j ACCEPT I've double checked the ip address I'm using corresponds to eth0 using ifconfig. Any ideas where I went wrong?

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how do I create a bidirectional bridge using iptables

- by Kolzoi

Setup: I have a samsung LCD TV that is connected via eth0 to a T41 Thinkpad running Ubuntu 10.10 which is wirelessly connected to the home router. I am trying to get Samsung's remote control app working on my iPad but the app won't allow me to put in an ip address and only discovers the tv if it's on the same subnet as the iPad (lame). So I need the laptop to route packets from eth0 to the wireless interface (wlan0), and I need about 3 ports on the wlan0 interface to be forwarded to the samsung tv. Hopefully all this makes sense. I've been messing around with iptables and samsung is now able to access internet via laptop wireless, but mapping from wlan0 back to the samsung tv is eluding me.

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IPP Printing from Windows 7 Ultimate

- by Casey

I have network IPP working on Ubuntu and Windows XP. On my Windows 7 instance, it refuses to acknowledge the remote server connection. Can anyone suggest how to configure this correctly? My install steps are: Add Printer Add a Local Printer Create a New Port and "Standard TCP/IP Port" Enter hostname http://host:631/printers/Printer_Name After that it says the printer is not detected, asks me to pick a driver, and finish up. Trying to use the device does not produce any output? If anyone has got this work, I would really appreciate a fix.

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How do I troubleshoot a page not found error when configuring IIS6 Windows Server 2003? [Page Not Found]

- by Vinicius Ottoni

I have configured IIS6 in my windows server 2003 with this link: http://www.simongibson.com/intranet/iis6/ After that I create a new web site inside Web Sites directory. Inside the physical path I created an index.htm that has: <html> <body>Test</body> </html> But I got the following error: "The page cannot be found". When I put the same index file inside the Web Site Default physical path, it works. I configured the new web site with the link above using the IP configuration and without a Host Header.' What should I do to troubleshoot this or is there an obvious configuration error?

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Determining the State of a User using their Hostname

- by PhpMyCoder

Not sure if this is the right SE site. I figured this question doesn't belong on SO, but if you think it doesn't belong here either, I apologize. I've been looking into determining the location, specifically the state, of a user accessing my website. One of the options I've known about for a while is the GeoIP City Database, however this isn't the most cost effective solution and I'm cheap so I was looking for a less expensive way. Something that occurred to me was that my state was in the public hostname assigned to me by Comcast: (Dash Separated IP).hsd1.ma.comcast.net Could it be possible that other ISPs follow this same pattern of inserting the state abbreviation into their users' hostnames? I've been looking around for a list of hostnames for other ISPs, but I haven't found anything. Can anyone verify that this holds true for other major ISPs?

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Setup IPv4 local on IPv6 VPS

- by A.D.

I have a dedicated server running multiple IPv6 only OpenVZ containers. I want them to be able to communicate with the IPv4 internet, but I realized that isn't going to be possible with IPv6 only. So they need to have an IPv4 address as well, not sure if a local address will work for it, but pretty sure it should. I added 169.254.1.100 in the container .conf file, but when I try to start it, I get this : Adding IP address(es): (the IPv6 address) 169.254.1.100 arpsend: 169.254.1.100 is detected on another computer : 00:04:9b:f2:b0:00 vps-net_add WARNING: arpsend -c 1 -w 1 -D -e 169.254.1.100 eth0 FAILED I did a lot of research, and searched serverfault before posting this, but found nothing relating to this.

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Firewall still blocking port 53 despite listing otherwise?

- by Tom

I have 3 nodes with virtually the same iptables rules loaded from a bash script, but one particular node is blocking traffic on port 53 despite listing it's accepting it: $ iptables --list -v Chain INPUT (policy DROP 8886 packets, 657K bytes) pkts bytes target prot opt in out source destination 0 0 ACCEPT all -- lo any anywhere anywhere 2 122 ACCEPT icmp -- any any anywhere anywhere icmp echo-request 20738 5600K ACCEPT all -- any any anywhere anywhere state RELATED,ESTABLISHED 0 0 ACCEPT tcp -- eth1 any anywhere node1.com multiport dports http,smtp 0 0 ACCEPT udp -- eth1 any anywhere ns.node1.com udp dpt:domain 0 0 ACCEPT tcp -- eth1 any anywhere ns.node1.com tcp dpt:domain 0 0 ACCEPT all -- eth0 any node2.backend anywhere 21 1260 ACCEPT all -- eth0 any node3.backend anywhere 0 0 ACCEPT all -- eth0 any node4.backend anywhere Chain FORWARD (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 15804 packets, 26M bytes) pkts bytes target prot opt in out source destination nmap -sV -p 53 ns.node1.com // From remote server Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2011-02-24 11:44 EST Interesting ports on ns.node1.com (1.2.3.4): PORT STATE SERVICE VERSION 53/tcp filtered domain Nmap finished: 1 IP address (1 host up) scanned in 0.336 seconds Any ideas? Thanks

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Browser considering www domain and without www domain different

- by user1444680

I've bought a domain name and hosted it. My browser is storing separate passwords for mydomain.com and www.mydomain.com, and also caching them separately. I want these two to be considered the same website. The zone records of mydomain.com are: "A" record: "@" points to the IP address of my hosting CNAME: www points to "@" As CNAME signifies alias, shouldn't browser understand (like search engines do) that the two URLs refer to the same website? Is it browser's fault? Please tell how to correct the problem? Do I need to enter some other record for www instead of CNAME?

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How can I re-create Microsoft Cluster Service resource groups on a different cluster?

- by PersonalNexus

I use Microsoft Cluster Service on a cluster of Windows Server 2003 machines containing several dozen resource groups. In the process of migrating to newer hardware, I would like move resources to the new machines on resource group at a time spread out over a few days to ease the migration and minimize risk. I was wondering of there was a smarter way to do this than manually re-creating resources on the new and then deleting them on the old cluster? The cluster has already been set up properly, the only missing is the resource groups and the resources they contain (IP, network names, services...). I have looked through the options of the cluster admin GUI and cluster.exe's commandline options, but haven't found anything like an import/export feature to copy over the configuration of a resource or entire resource group. Does something like this exist?

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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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arp across subnets which devices can be detected?

- by Gobliins

i have some devices connected in the same physical network (LAN) but in different subnets. I want to detect them all with the ARP from my computer. My Computer is also in the same physical network but on a different subnet. ! The devices have no arp protocol installed (yet). Is it possible to detect the devices (with or withour ARP installed on every device)? If the devices have a MAC-address but no IP-address, can ARP still detect the machines?

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Simple secured SFTP tunnel?

- by babonk

I'd like to setup an sftp tunnel so that I can connect to an IP-secured SFTP server through a gateway computer from anywhere, and download the files to anywhere. I was thinking of using a combination with netcat, having it listen to either WinSCP or PuTTY sFTP (doesn't matter which). Not sure how I would download the files to the connecting computer though. I would like the tunnel to be secured, preferably, with a username/password. I'm open to using alternative software but I'm looking for unintrusive, simple command line stuff because I don't want to install a lot on this computer. Thanks

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Workaround for API limits [closed]

- by blunders

Problem: Planning on building out a client services company that requires access to APIs. Most APIs are limited based on user, IP, etc. - and even though the API calls would be on a per client basis, there's no way to get usage not tied to IPs. (Theoretical) Solution: Have each client install on their network a proxy/VPN that would allow my systems to connect and use their assigned usage. So, it's possible there's a better solution than the one I've thought of, but it's the only one I've been able to come up with.

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User for Public Network

- by user71604

my computer can catch the signal for many Access Points for the same network, while the network has problem with internet connection in some APs and it's working in others "all APs have the same SSID" Please advice if as i user i can force my computer to connect with specific AP neither than to go with the one with higher power (through MAC adress or IP)?. I am sure that my computer catch more than 10 signals for APs"All with same SSID". I am using windows 7 home primume 64 bit. as a user i dont have access to the AP config.

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controlling the bandwidth using tc

- by Supratik

Hi I have two NIC etho is connected to the internet and eth1 is connected to the LAN. I want to restrict the download limit using iptables and linux tc. So I wrote a test script to verify if it is working. My iptables configuration is as below. iptables -t mangle -N INBOUND iptables -t mangle -I PREROUTING -i eth0 -j INBOUND iptables -t mangle -A INBOUND -j MARK --set-mark 60 My ingress configuration is as below. tc qdisc add dev eth0 handle 1: ingress tc filter add dev eth0 parent 1: protocol ip prio 1 handle 60 fw police rate 100kbit burst 20kbit drop flowid :1 Can you please tell me what I am missing here ?

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Url-based web site publishing on Windows Server platform

- by Maxim V. Pavlov

I have a Windows 2008 Enterprise SP2 server in a datacenter. It is 32bit OS. I need to be able to do a "smart" url-based web site publishing. So that with a single external IP I can publish many sites on port 80, and some firewall logic resolves, based on a requested URL, which site in IIS gets the request. Forefront TMG 2010 has this feature, but it is not supported on 32bit systems. Is there a software solution that can satissfy my need on Windows 2K8 platform? Thank you. P.S. Perhaps there is a workaround or a tweak to do what I need in IIS?

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how to properly edit hosts, hostname and resolf.conf? [migrated]

- by Firewall

i,v been searching the internet for a real noop tutorial on the subject but could not found any direct info. on how to edit these files the proper way. i,v got a debian internet server that i use to host some personal domains and runs squid and rTorrent. the server is up and running with no problems but i am confused about a few things. lets say that i named my server (foo), my domain is (example.com) and my public IP is 95.211.133.200 now: should /etc/hostname contains: tango.example.com or tango <----- just the server name should /etc/hosts contains: 127.0.0.1 localhost.localdomain localhost 95.211.133.200 foo.example.com foo should /etc/resolf.conf contains (along with the nameservers) both: domain example.com search example.com or just the first one. are there any other files that i should edit in order to make things right? last thing, the command: domainname returns: (none) i believe it should return (example.com). what should i do to correct that?

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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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Default documentroot apache does not work

- by James Wise

I have apache version 2.2 and php 5.3.15 on a single server. I configured virtual hosting and a default vhost. 0_default_.conf - goes to /var/www/default sub.domain.com.conf - goes to /var/www/sub.domain.com My question is, how could I set the default documentroot to sub.domain.com permanently? That means all request should be redirected to sub.domain.com. I try to remove 0_default_.conf but when viewing the page it display the php source code of sub.domain.com. Here is my configurations -- http://pastebin.com/4e3awUJ4 Although I can create index.php to /var/www/default and permanently redirect to sub.domain.com site but it's not viable solution for me because what if I didn't point the ip address of sub.domain.com to the server so user cannot view that subdomain. I would appreciate if anyone could share their knowledge and wisdom. Thanks. JamesW

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Exchange and external mail server

- by Bahrain Admin

Hi, We have our domain hosted externally with Network Solutions, and our mail server is running from there. We have a branch office in Bahrain and have 3 users who would like to use their email addresses on a local exchange server running at the Bahrain office. The Exchange server is currently only used for internal mail,contacts and calendaring. I've used a third=party program to download the POP3 mail to their exchange accounts. so they can receive mail from outside. The issue is in sending mail using their external addresses. I've setup their exchange accounts to include their external address. But we get an error message stating that the IP is not authorized. I tried putting the local ISP as the smart host, but then we get an error message stating that the Address was rejected. I tried using our own external mail server as the smart host, but then the message "Relaying is denied" comes up. Any suggestions? Thanks Arun

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Seeing DNS changes takes too long on my PC, can it be my router misconfiguration?

- by Borek

I administer a few sites and need to update their DNS entries from time to time, e.g., adding an A-record point certain subdomain to a certain IP. When I check sites like http://www.opendns.com/support/cache/, I can clearly see the DNS change taking effect throughout the world - is it just my PC that can't see this change (ping newsubdomain.example.org says it cannot resolve host name) The network "map" is like this: My PC -> my router -> my ISP's router -> internet On my PC, the DNS is set automatically which means that if I run iconfig /all, my router will be returned as the DNS server (192.168.1.1). On my router, the DNS is set to be what my ISP provided me with. Is this correct? What can I do to see new hostnames resolved quicker?

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Windows 2012 remote access can't connect

- by Gelo Volro

I have installed Windows Server 2012 for about 9 months ago. Earlier I could connect to my server with an external IP perfectly, but the license for the remote desktop services has ended. First, I thought it was the reason, why I couldn't use my server as RDP-server, to which users may connect. But, than in web I read, that it's possible to use windows native features, just to remove the RDP services, which are trial and the server will work as RDP-server, but with some limitations ( for e.g. such free RDP service may accept only 1 connection and other connection will be disconnected etc ). Is it true, that it's possible? If yes, please give a piece of advice, how should I repair it. Because I don't want to use TightVNC or other stuff. Thanks!

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Does Windows 7 VPN push Client DNS?

- by K20GH

I'm using a VPN in conjunction with my iPad (no OpenVPN sorry!) so have just configured the Windows 7 PPTP VPN and i've got it working fine. However what I need to know is will it force my iPad to use the global DNS settings configured in Windows, or will it use the DNS settings i've set on my iPad? I've got unblock-us at home and would like to use it on my iPad while i'm away. Since unblock-us uses IP addresses it wouldn't work on my iPad outside of my home network, hence the use of a VPN ;) The only issue is I don't want to use unblock-us DNS's on my Windows box, only on my iPad

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Linux server failover

- by Lukasz

I have two Linux servers (CentOS6) - both are identically configured connected to the same switch with a direct link between them. I only have one external IP that is assigned to eth0 on both servers (connected to the internet switch) with the interface shutdown on server 2. How can I failover to server 2 if server 1 dies - as stated they are linked directly so they can check for availability of each other via ping/tcp/udp. I toyed with Heartbeat but the documentation seems to be non-existent - not sure how to bring up an interface and start some services if the other server dies.

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