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• why do I get this mail server configuration error?

  - by Francesco

  <<The configuration of your mail servers and your DNS are not ok! The report of the test is: mail.mydomain.com. -> mydomain.com -> 78.47.63.148 -> static.148.63.47.78.clients.your-server.de Spam recognition software and RFC821 4.3 (also RFC2821 4.3.1) state that the hostname given in the SMTP greeting MUST have an A record pointing back to the same server.>> I have a A Record that points mail.mydomain.com to 78.47.63.148 (which is my given ip address for my vps) All other records are fine, so what's wrong and what record should I create to make it right? Thanks

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• Something is spamming from my hMail server - how can I deal with this?

  - by joshcomley

  My Windows 2008 server is attempting to send out a lot of spam, I've just discovered, and I'm not sure how to see where the compromise is. For example: has someone hacked an account? Has someone hacked the server? Is there a virus on the server? What can I do to investigate this? Edit Thanks for the replies so far. I am running hMail server, and have spent so long investigating the correct configuration but still I end up with these emails being sent. Here is a screenshot of my Internet IP range settings on the server: (let me know what else I can provide to help)

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• Computer Loses connection to router

  - by ajon

  I have a new Windows 8 Dell XPS desktop computer at work. It has a Dell Wireless 1703 802.11 b/g/n (2.4ghz) wireless adapter. sporadically throughout the day I lose internet connectivity. When I click on the wireless system tray icon, my companies router does not appear in the list. No other computer on the network is losing connection, only this one. I don't even know what to check. Could it be an ip conflict that causes me to get booted off? (I use DHCP), but why wouldn't my computer be able to see the network. The next time it happens I will see what happens when I try to access the router directly.

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• Auto logon to internet provider

  - by user31673

  We use wireless internet access. The wireless is secured and to get an IP address, you provide the right key. That is setup just fine. However, on top of that, the first time we access the internet, a browser page appears and we have to enter a password. then we have access to the internet for a period of time. How can the password step be automated? I also have a web-based printer that doesn't work (except via USB connection) because it can't get out to the web. I can't change the router settings. Is there anything I can do to get the printer working and automatic the access?

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• HTTPS vs. VPN for communication between business partners?

  - by Andrew H

  A business partner has asked to set up a site-to-site VPN just so that a few servers can communicate with each other over HTTPS. I'm convinced this isn't necessary, or even desirable. To be fair it must be part of a wider policy, potentially even a legal requirement. However I'd like to convince them to simply offer an IP to us (and us only) and a port of their choosing for HTTPS. Has anyone had a similar experience, or had to come up with a cast-iron argument against a VPN? Allow me to expand a little - we have a web service that initiates a connection to the partner's corresponding service using an encrypted HTTP connection. The connection uses a client certificate to authenticate. The connection is firewalled so only our IPs can contact the service. So why is a VPN necessary?

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• Run a server and local wireless network off my laptop with no internet.

  - by greg

  I'm trying to run a wireless network from my computer so that people in range can connect to the network and hit a website running off my machine. I don't want to enable file sharing or remote access or anything else of that nature. I just want them to be able to connect to the network, type in an IP or domain name in a browser, and be taken to a locally hosted website. No broader internet access needed. Any ideas / links to good tutorials on the subject? Is this something i can achieve with just a wifi card or will need a router?

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• What should a hosting company do to prepare for IPv6?

  - by Josh

  At the time of writing The IPv4 Depletion Site estimates there are 300 days remaining before all IPv4 addresses have been allocated. I've been following the depletion of IPv4 addresses for some time and realize the "crisis" has been going on for many years and IPv4 addresses have lasted longer than expected, however... As the systems administrator for a small SaaS / website hosting company, what steps should I be taking to prepare for IPv6? We run a handful of CentOS and Ubuntu Linux systems on managed hardware in a remote datacenter. All our servers have IPv6 addresses but they appear to be link local addresses. Our primary business function is website hosting on a proprietary website CMS system. One of my concerns is SSL certificates; at the moment every customer with an SSL certificate gets a dedicated IPv4 IP address. What else should I be concerned about / what action should I take to be prepared for IPv4 depletion?

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• Tracing what program is making a network connnection? (CentOS)

  - by Airjoe

  I was wondering if it is possible to find out which process is trying to make a specific network connection. On a server I support which hosts websites for about 200 users, the iptables firewall keeps blocking, as it should, a connection to 212.117.169.139 on port 80. Firefox reports this as an attack page (and at the least is obvious spam, if not malicious). It seems something on this server is trying to access this site for some reason, and although it's being blocked successfully, the requests seem to be going through every two to sixty seconds and I'd like to be able to find what process or script is doing this so I can handle it appropriately. Besides doing a grep to try and find if this IP is in some file (which probably won't even work because it may be working by hostname or it may be encoded), is there any way to find out some more information? Thanks!

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• How to use postfix header_checks with zarafa outgoing mail

  - by olvrlrnz

  I'm using zarafa as MDA with postfix. For privacy reasons I want to filter client internal IP-addresses and stuff like this. To do so I've added the following to master.cf: submission inet n - - - - smtpd [...] -o cleanup_service_name=subcleanup [...] and further down the file: subcleanup unix n - - - 0 cleanup -o header_checks=pcre:/etc/postfix/smtp_header_checks which works perfectly for clients delivering their mail through the submission port. But my zarafa is of course not using the submission port to send mail, hence it doesn't hit the subcleanup routine and outgoing mails contain a very nice X-Mailer: Zarafa-exact_version header which is rather unsatisfying. Is there any way to make zarafa use the subcleanup routine? Any help is much appreciated.

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• How to route local traffic over switch?

  - by Franz Kafka

  I'm just cabled up at home but haven't got any way of verifying that gigabit speed can be reached. As I've only got one laptop with one network card, one cable, and one switch, I'm kind of stuck. I'm using a tool that you can start as a server or as a client to send data from one box to another. I would like to send and receive on the same Windows box. I guess if I use my network local IP address, my Windows 8.1 PC will just route traffic internally. Is there some way of forcing the traffic to go to the switch and back again?

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• After a period of time, nslookup still works, but pinging, and an auto-refeshed website, fails.

  - by Mark Hurd

  Contrary to this SO question this is for a dotted name (gw.localnet.au), and it doesn't happen straight away. Only after some period of time (quite a long time, possibly days). In fact this is for my ADSL router and its internal IP address which I have named within the router itself and in my Windows Server 2003 Domain Controller DNS Service. Specifically, localnet.au is a Active-Directory-backed primary domain. In fact, an ipconfig /flushdns may fix the problem, but only after a while (about the time it took me to type in this question :-) ). That doesn't explain the root cause though... Manually transferred from stackoverflow.com

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• Setting Rails up on a Linode - Nginx Issue

  - by rctneil

  I am extremely new to this so please don't shoot me down: I have set up a Linode running Ubuntu, It is all sort of working except Nginx. I am following this guide: http://rubysource.com/deploying-a-rails-application/ And this for nginx: http://library.linode.com/web-servers/nginx/installation/ubuntu-10.04-lucid When I go to my IP, I get a 500 internal server error. I have tried starting nginx and it looks like it starts fine. I run this: ps awx | grep nginx and I get: 308 ? Ss 0:00 nginx: master process /usr/sbin/nginx 2309 ? S 0:00 nginx: worker process 2311 ? S 0:00 nginx: worker process 2312 ? S 0:00 nginx: worker process 2313 ? S 0:00 nginx: worker process 2850 pts/0 S+ 0:00 grep --color=auto nginx I really am not sure what else to do to get it running. Any help? Neil

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• Add a server between router and switch (production)

  - by Kossel

  I have a small office network basically like below, there are more router/pc connected in S1. As you can see, the router is doing job of DHCP, DNS. but now I wish to add a Linux server between R1 and S1, So I can monitor the network traffic and do other more advance server admin stuff. the whole office network is 192.168.1.x and people are using their computer everyday. What network configuration should the new Linux server have (both interfaces) in order to minimize the changes need in the network? tried to change R1 ip to 192.168.100.1 them add the server with FE0/0 192.168.100.1 and FE0/1 192.168.1.1 but looks cannot ping the original Router..

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• best way to record local modifications to an application's configuration files

  - by Menelaos Perdikeas

  I often install applications in Linux which don't come in package form but rather one just downloads a tarball, unpacks it, and runs the app out of the exploded folder. To adjust the application to my environment I need to modify the default configuration files, perhaps add an odd script of my own and I would like to have a way to record all these modifications automatically so I can apply them to another environment. Clearly, the modifications can not be reproduced verbatim as things like IP addresses or username need to change from system to system; still an exhaustive record to what was changed and added would be useful. My solution is to use a pattern involving git. Basically after I explode the tarball I do a git init and an initial commit and then I can save to a file the output of git diff and a cat of all files appearing as new in the git status -s. But I am sure there are more efficient ways. ???

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• Computer Invisible On Domain

  - by Giawa

  Good afternoon, I'm sorry that this isn't a programming question specifically, but stackoverflow has been great at answering questions in the past, so I thought I'd give it a shot. One of our Linux users attempted to install Cygwin on our Windows Server 2008 Domain Controller. Now it is no longer possible to browse the domain and see all of the computers. For example, \\my_domain_name will just bring up a username/password dialog box (that will not accept any username or password, even the domain administrator) and no computers will ever be listed. However, I can still connect to computers based on their name or IP address. So \\eridanus or \\192.168.1.85 still work to connect to the shared directories of computers on our network. Does anyone know where I can find these settings? and how I can fix this problem? Thanks, Giawa

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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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• Windows Server 2003: Router, DHCP, Loses internet connection

  - by jM2.me

  I have following setup: a windows server 2003 dedicated server with tho nics. One is connected to internet (no modem/router), and second one is connected to private network. Server has DHCP server installed on it and internet nic is being shared for internet access. The problem is sometimes server loses connection to the internet, so same happens to private network. So far I can manually fix it by releasing and renewing IP address. What could be the cause of this problem? DHCP lease from ISP? Thanks

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• Bind dns server in Solaris 10 and win xp clients

  - by stevecomptech

  Hi, Added this in zone db file, i am running solaris 10 _ldap._tcp.mydomain.com. SRV 0 0 389 dc.mydomain.com. _kerberos._tcp.mydomain.com. SRV 0 0 88 dc.mydomain.com. _ldap._tcp.dc._msdcs.mydomain.com. SRV 0 0 389 dc.mydomain.com. _kerberos._tcp.dc._msdcs.mydomain.com. SRV 0 0 88 host.mydomain.com. Now i get this error when i try to join win xp to the domain The query was for the SRV record for _ldap._tcp.dc._msdcs.mydomain.com The following domain controllers were identified by the query: host.mydomain.com Common causes of this error include: Host (A) records that map the name of the domain controller to its IP addresses are missing or contain incorrect addresses. Domain controllers registered in DNS are not connected to the network or are not running. What do i need to change in order my win xp join the domain

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• Log incoming requests on Ubuntu (ports 80, 443)

  - by Maxim Eliseev

  We have Tomcat running on Ubuntu server. It runs a web service, open to the internet. Sometimes it has a sudden spike of traffic and goes down. There is nothing unusual in Tomcat access logs. I guess it is because some of the requests are so 'heavy' that they never finish and hence are not recorded to Tomcat access logs. Is there a way to configure Ubuntu to log incoming requests in the following format (below)? Date, Time, URL (with query string params), IP address (of client) There should be one line per request. Each request should be logged before it is executed. Only incoming requests to ports 80 and 443 should be logged.

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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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• nginx + IIS + GET

  - by Eralde

  I have nginx on pc "A" & IIS with ASP.NET on pc "B". nginx is configured like this: ... location ~ ((Web|Script)Resource.*)$ { proxy_pass "B"/$1; proxy_redirect off; proxy_set_header REMOTE_ADDR $remote_addr; proxy_set_header REQUEST_URI $request_uri; proxy_set_header HTTP_REFERER $http_referer; #proxy_set_header REQUEST_URI $request_uri; proxy_set_header QUERY_STRING $query_string; proxy_set_header X-Real-IP $remote_addr; proxy_set_header Host $http_host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; }... but requests to "B"/WebScript?a=b&c=d aren't able to deliver GET data (a=b&c=d) to IIS part. Could anyone help with this?

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• VLSM help required

  - by user68062

  I have confused myself following a VLSM tutorial and need to get my understanding confirmed, would this be the correct format, or am i away off again 172.31.0.0 VLSM this network address for as many subnetworks as possible, with no more than 14 hosts in each subnetwork. Show the subnet mask used. As the ip address is class b and contains 16 bits in the network portion, this means that we can have 2^16 = 65536 possible networks, to give each of these networks a maximum of 14 hosts we would use the subnet prefix \28 for each subnet. Is this correct? Thanks BB

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• VPN IPsec site 2 site and static routing

  - by Giacomo

  Hello everybody experts! My question is pretty simple, but I can't figure it out because I'm pretty noob with these network stuffs. I have a vpn IPsec site2site between 2 lan with different ip classes, LAN A is class C and LAN B is class A. The vpn presents the LAN A to LAN B with the 10.178.51.64/27 segment. The problem is that when I start the vpn connection I cant Ping any 10.174.0.0/24 address(LAN B remote segment) from my LAN A; I think I need some kind of static route. Could u help me out pls? Thx Regards

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• Cannot resolve a single A Record from client machine

  - by Alex

  I set up a simple Bind server on my VPS and it is working properly. The problem occurs with my local windows machines, which are connected to internet through the home router. I created an A-record named 'dev' and it is invisible from my local network for some reason, though people from other locations can resolve dev.mydomain.com. Ironically, dev.mydomain.com cannot be resolved for myself only. If I add another A-record, say, 'gamma' then it becomes visible from my local windows machines instantly. So this is just for that particular 'dev' name. The only difference is that I had dev.mydomain.com server on another IP but that was a month ago; all nameservers have been changed since then. I tried to reboot my router and flushed dns cache on windows machines: no result. Thank you in advance.

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• Direct Access on Server 2012

  - by francisswest

  Scenario: Windows Server 2012 with the Remote Access role installed. IP set to static, registered DNS. 3 domain controllers, all running Server 2003 (I suspect this may be the issue) Done so far: DNS registered, firewall turned off after IPsec was applied. Able to ping all 3 DC's with no issues Problem: Going through the DA wizard generates this error. I am logged in as a domain admin, verified that I can ping the DC, verified IPsec allows me to contact it. Since this version hasnt been readily deployed yet, there isnt much help available online from what I can find. Any assistance ayone could provide would be greatly appreciated. I am still new to the server world as far as things are considered. I would fit, user wise, between Superuser.com and serverfault.com (junior admin) Thanks to anyone who may be able to assist!

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