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• Set ReturnPath globally in Postfix

  - by Gaia

  I have Magento using Sendmail and Wordpress using PHPmailer to send webapp-generated mail. Occasionally, someone will enter their email address incorrectly and the mail (let's say, a purchase receipt) will bounce back to the return-path specified by the script. I dont want to set the return path for each vhost, especially because it is not easily done. Ideally, WP would use the address of the blog admin and Magento would use one of the numerous email fields specified, but they default to using username@machinename (in my case, username is the system user and machinename is a FQDN, but it is not the same as the actual vhost FQDN). The result is that bounced mail returns to the server and, since the server is used only for outbound SMTP, the messages sit there, undelivered and worse, unread. I'm Postfix 2.6.6 on CentOS 6.3, is it possible to globally force a specific returnpath for all messages sent via PHP on the server?

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• httpd (no pid file) not running while restarting apache

  - by user59503

  Hi I am working on ubuntu. I got the error messages while try to restart apache. root@XXX:/etc/init.d# sudo /etc/init.d/apache2 restart * Restarting web server apache2 apache2: Could not reliably determine the server's fully qualified domain name, using xxx.xxx.xx.xxx for ServerName httpd (no pid file) not running apache2: Could not reliably determine the server's fully qualified domain name, using xxx.xxx.xx.xxx for ServerName (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs I got the following message when tried netstat -pant tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 0 32748 9950/httpd tcp 429 0 xxx.xxx.xx.xxx:80 xxx.xxx.xx.xxx:xxxxx CLOSE_WAIT 0 0

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• Unable to access the server via SSH

  - by Rishee

  when I am trying to access the server through ssh it says: ssh: connect to host xx.yyy.zzz.x port 22: Connection refused and on the server in auth.log it shows following log entry: Address xx.yyy.zzz.x maps to xx.yyy.zzz.x.static-pune-vsnl.net.in, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT! I have created a user account for that user and it is also in enabled status. Requested info It is Ubuntu 11.10 It is configured as SSH Server using openssh-server I am trying to connect to this server using Putty from Windows 7 i.e. My Desktop I have also asked this on AskUbuntu: http://askubuntu.com/questions/118556/unable-to-access-the-server-via-ssh

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• How to disable auto-assume in Google Chrome

  - by Ieyasu Sawada

  I've noticed that whenever I sign in in Google Chrome version 21.0 it automatically assumes and it automatically knows what I want to search. I basically use the address bar to search(my default search engine is Google) I don't go type Google.com on the address bar and then search from there. So what happens is that when I type something for example "vernier" for vernier caliper I'm automatically redirected to my facebook account which has a user account name of vern.ancheta. It's really getting annoying, this happens for every search term that I used maybe even ones that I haven't used before in my entire search history in Google. It always assumes as if it knows what I'm really thinking. What's the solution for this? Is this a bug in Google Chrome or just one of its annoying features. Please enlighten me on this.

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• Server problem (duh)

  - by j-t-s

  Sorry the title couldn't be more specific. I installed Abyss Web Server. I'm running Windows XP Home Edition and I have Wireless Mobile Broadband internet. I used to be able to access (and other people on other networks) my site by entering my ip address in the browser, but after I formatted, and the installed abyss web server again, this does not work anymore. There are no errors. I CAN visit my own site by entering my ip address BUT anybody else can't do the same, it just says "connecting" in the browser's statusbar and it never changes. I have consulted the docs and have found no help. Google hasn't helped with this problem either. Can somebody please help? Thank you :)

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• Server problem (duh)

  - by j-t-s

  Sorry the title couldn't be more specific. I installed Abyss Web Server. I'm running Windows XP Home Edition and I have Wireless Mobile Broadband internet. I used to be able to access (and other people on other networks) my site by entering my ip address in the browser, but after I formatted, and the installed abyss web server again, this does not work anymore. There are no errors. I CAN visit my own site by entering my ip address BUT anybody else can't do the same, it just says "connecting" in the browser's statusbar and it never changes. I have consulted the docs and have found no help. Google hasn't helped with this problem either. Can somebody please help? Thank you :)

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• Can send to individual users but not when they are in a global distribution list.

  - by Jake

  I am able to send email to individual users but when not when they are in a distribution group. When I do I get this report. The message could not be delivered because the recipient's destination email system is unknown or invalid. Please check the address and try again, or contact your system administrator to verify connectivity to the email system of the recipient. #5.3.1 However, like I said before I can select their name from the GAL and send mail that way. Their email address is exactly the same in both the GAL and distribution group. The only difference is these users have external email addresses. Windows Server 2003 Exchange Server 2003 Outlook 2007 and 2010.

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• How to port forward https traffic via ssh and/or remote desktop to through several networks and PCs?

  - by donttellya

  I have the following environment: In company X I develop a application on a pc A in network A with ip address 192.168.100.50 which has to do an https request to an http server located in the intranet of company Y In company X is another pc B in network B with ip address 192.168.200.100 pc B (of company X) can access the intranet from company Y via ssh tunnel (putty) pc A (of company X) can ping pc B (of company X) note: pc A can also do a remote desktop connection to pc B) pc B can ping the http sever pc A can not ping the http server How can the https request from pc A of company X get to the http server of company Y? On which pc must be putty configured? And which settings for host, port forwarding etc. has to be done in putty? So finally the https request should go from PC A - PC B - Http Server in company Y.

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• After Upgrading Ubuntu to 9.10 my hard drive now has a warning.

  - by Sean

  it is a 500gb hard drive format as ext3 path /dev/sdc1 The disk utility does not even see this. This Warning is from gparted: e2label: No such device or address while trying to open /dev/sdc1 Couldn't find valid filesystem superblock. Couldn't find valid filesystem superblock. dump2fs 1.41.9 (22-Aug-2009) dumpe2fs: No such device or address while trying to open /dev/sdc1 Unable to read contents of this file system? Because of this some operations may be unavailable. END OF ERROR MESSAGE Did I lose something during the upgrade of the system? Was it the hard drive or the Ubuntu system that went bad?

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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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• Network configuration problem

  - by Musti

  in my dorm I have to change network configuration and then if it is successfull, I have to enter a user name and password for wired internet connection. Anyway, I had many attempts but I couldnt achieve, and please look at my steps and tell me if there is something wrong and at the end there is an error, but I really dont have any idea about this error. (I am a new ubuntu user, and network is far away of my interests) 1) /etc/network/interfaces auto eth0 iface eth0 inet static address 172.030.014.038 netmask 255.255.255.252 network 192.168.2.0 broadcast 192.168.2.255 gateway 172.030.014.038 2) sudo gedit /etc/resolv.conf nameserver 010.050.001.001 nameserver 010.050.001.002 3) /etc/init.d/networking stop Deconfiguring network interfaces... [ OK ] 4) /etc/init.d/networking restart Running /etc/init.d/networking restart is deprecated because it may not enable again some interfaces Reconfiguring network interfaces... 172.030.014.038: Unknown host ifconfig: `--help' gives usage information. Failed to bring up eth0 Note: IP-address, netmask, gateway, Preferred DNS server and Alternate DNS server ara given by the management of Dorm. It wad very easy in windows but I couldnt achieve in Ubuntu. I also tried to edit from "edit connections" but the save button is gray and I cannot save it. Thanks in advance. / Musti

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• adding a route entry to linux routing table

  - by netg

  hi, I have two systems with ip address say 64.103.56.1(A)(Dev name -wlan0) and 64.103.225.18(B),now what i want is , everytime I ping B from my system A, it has to be routed via a router say with address 10.0.0.251(C)(I want this to be my next hop to reach B) , but this router is on a different subnetwork than the two systems.How do I do this? /* Things I tried: I used 'route add -host B gw C wlan0', and got an error saying " no such process exist or no such device found". Tried ping C and traceroute and found the gw addr at my side is some 63.103.236.3(D), so added another entry route add -host C gw D wlan0, I was able to do this without any error! */

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• Cisco Aironet 1200 Series AP Configuration

  - by nonterrorist

  I am attempting to configure a new CISCO Aironet 1200 Series Access Point to have a fixed IP. I have been searching online and I have come to the conclusion that the default IP address of this device is 10.0.0.1. These are the steps I have taken: My machine is plugged directly into the Ethernet port (not the Console port) of the AP. My Ethernet adapter is set to 10.0.0.2. I have reset the AP by holding the Mode button while powering up the device. The issue remains that I can not access 10.0.0.1 through the web, nor can I ping that address.

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• route http and ssh traffic normally, everything else via vpn tunnel

  - by Normadize

  I've read quite a bit and am close, I feel, and I'm pulling my hair out ... please help! I have an OpenVPN cliend whose server sets local routes and also changes the default gw (I know I can prevent that with --route-nopull). I'd like to have all outgoing http and ssh traffic via the local gw, and everything else via the vpn. Local IP is 192.168.1.6/24, gw 192.168.1.1. OpenVPN local IP is 10.102.1.6/32, gw 192.168.1.5 OpenVPN server is at {OPENVPN_SERVER_IP} Here's the route table after openvpn connection: # ip route show table main 0.0.0.0/1 via 10.102.1.5 dev tun0 default via 192.168.1.1 dev eth0 proto static 10.102.1.1 via 10.102.1.5 dev tun0 10.102.1.5 dev tun0 proto kernel scope link src 10.102.1.6 {OPENVPN_SERVER_IP} via 192.168.1.1 dev eth0 128.0.0.0/1 via 10.102.1.5 dev tun0 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.6 metric 1 This makes all packets go via to the VPN tunnel except those destined for 192.168.1.0/24. Doing wget -qO- http://echoip.org shows the vpn server's address, as expected, the packets have 10.102.1.6 as source address (the vpn local ip), and are routed via tun0 ... as reported by tcpdump -i tun0 (tcpdump -i eth0 sees none of this traffic). What I tried was: create a 2nd routing table holding the 192.168.1.6/24 routing info (copied from the main table above) add an iptables -t mangle -I PREROUTING rule to mark packets destined for port 80 add an ip rule to match on the mangled packet and point it to the 2nd routing table add an ip rule for to 192.168.1.6 and from 192.168.1.6 to point to the 2nd routing table (though this is superfluous) changed the ipv4 filter validation to none in net.ipv4.conf.tun0.rp_filter=0 and net.ipv4.conf.eth0.rp_filter=0 I also tried an iptables mangle output rule, iptables nat prerouting rule. It still fails and I'm not sure what I'm missing: iptables mangle prerouting: packet still goes via vpn iptables mangle output: packet times out Is it not the case that to achieve what I want, then when doing wget http://echoip.org I should change the packet's source address to 192.168.1.6 before routing it off? But if I do that, the response from the http server would be routed back to 192.168.1.6 and wget would not see it as it is still bound to tun0 (the vpn interface)? Can a kind soul please help? What commands would you execute after the openvpn connects to achieve what I want? Looking forward to hair regrowth ...

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• sizes of RAM, of virtual memory and of swap for 32-bit OS

  - by Tim

  If I understand correctly, a 32-bit OS (Ubuntu) can only address 4GiB memory, so RAM with size larger than 4Gib will only be used 4Gib of itself and the rest is a waste. I am now confused about this situation for RAM with similar one for virtual memory and for swap. with virtual memory being swap + RAM, if the size of the virtual memory exceeds 4Gib, will the exceeding part be a waste for the 32-bit OS? if I now have to choose the size for my swap partition, is it a factor to consider that the 32-bit OS can only address 4GiB memory? Does the size of swap have to be chosen with respect to the 4Gib addressible limitation? Will the swap exceeding 4GiB always be a waste? is virtual memory equal to RAM and swap? or can virtual memory use space on the hard drive outside the swap partition? Thanks and regards!

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• I want to start my portfolio site using ASP.Net and I'm a bit lost about hwo to actually put it on t

  - by Papuccino1

  I found this site: www.discountasp.net They seem cheap enough and have a track record. I decided to host my site with them. Here's where I'm confused. I host the application (my website) with them and they give me an IP address, right? Users can visit my site by typing in that IP address right? (Of course once I move the index file and create a defauly web folder, etc.) Next step is buying a domain name right? Like www.mysite.com, right? Is this the way it's done, or am I doing it wrong?

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• FTP Connection established...Connection timed out problem with all my sites and FTP programs?

  - by janoChen

  Just few hours ago FileZilla was working fine. Then, suddenly I started to get this error: Status: Resolving address of ftp.readtypechinese.com Status: Connecting to 69.175.14.60:21... Status: Connection established, waiting for welcome message... Error: Connection timed out Error: Could not connect to server And it happens with all my sites: Status: Resolving address of edasich.dreamhost.com Status: Connecting to 173.236.223.223:21... Status: Connection established, waiting for welcome message... Error: Connection timed out Error: Could not connect to server I'm using FileZilla 3.5.0 and Ubuntu 11.10. Any suggestions to fix this? (I already tried Passive mode and it doesn't work). EDIT: Ocasionally, the log goes beyond the ...waiting for welcome message: Status: Connection established, waiting for welcome message... Response: 220 DreamHost FTP Server Command: USER aleche23 Error: Connection timed out Error: Could not connect to server But the connection gets timed out again. Weird...I just realized that I have the same problems with other FTP programs too: gFTP: Looking up ftp.readtypechinese.com Trying readtypechinese.com:21 Connected to readtypechinese.com:21 220 ProFTPD 1.3.2 Server (server) [69.175.14.60] USER [email protected] Connection to ftp.readtypechinese.com timed out

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• Apache Virtual Host Configuration

  - by Carl

  I have been searching the internet for an hour now, and I was hoping for a quick hint here so that I could solve my problem a wee bit faster. My virtual server is so far only accessible through an IP address, no DNS entry yet, and so far none needed either. The problem I have is with Apache2, the virtual hosts are puzzling me. What I need is: Access to my project (based on Symfony2) from the outside with the IP address Access to my project from localhost What I have got: Access from the outside results in rendering the websites in /var/www/vhosts/htdocs/default, while from the inside results in rendering the websites in /var/www. Why the difference? What is a recommended configuration for my use case?

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• Is the BCM4306 wireless card ipv6 capable?

  - by horroricane

  I've been trying to connect with ipv6 enabled networks with my Broadcom Wireless card under Ubuntu 12.04. The wireless card model is BCM4306. $lspci $Network controller: Broadcom Corporation BCM4306 802.11b/g Wireless LAN Controller (rev 03) $Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10) I have been unsuccesful to connect through an ipv6 address, but I can still connect to a network when assigned an ipv4 address. While searching for an answer or a solution, I know the kernel can handle dealing with ipv6. So, what's left to question should be the hardware handling the connection. Unfortunately nothing comes up when I specifically try to search for information on BCM4306 ipv6 capabilities. I just tried using a wired connection to establish an ipv6 only connection to the network I'm on right now, but I got the same behavior of constant disconnections. Maybe it's not the hardware? I don't know.. I don't want to disable ipv6 on my machine as relevant networks I'll be connecting to will be using it exclusively, but I'm not sure what is wrong and which parts should I replace/fix to get this working.. Could someone please point me in a fruitful direction to get ipv6 working under Ubuntu 12.04?

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• vncviewer connection refused (61)

  - by coure2011

  I have a root access to VPS (centos 6). I have installed VNCServer using this guide line http://tournasdimitrios1.wordpress.com/2011/02/02/how-to-setup-vnc-server-on-centos-5-x-fedora-11/ Everything goes perfectly and server is running via termina. Now I am trying to connect to that server via vncviewer (mac os). but its giving me error Connection refused (61) I am providing only the IP address of the VPS, maybe I also needed port address? How to configure port on vncserver? or its something else?

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• Finding a private (NAT) host's IP using historic destination data

  - by l0c0b0x

  The issue: An unknown private (NAT) client is infected with malware and it's trying to access a Bot server at random times/dates. How we know about this: We receive bot traffic notices/alerts from REN-ISAC. Unfortunately, we don't receive those until the next day after it has happened. What they provide to us is: The source address (of the firewall) The destination addresses (it varies, but they're going to network subnet allocated to a German ISP) The source port (which varies--dynamic ports). Question: What would be the best approach to finding this internal host (historically) with a Cisco ASA as firewall? I'm guessing blocking anything to the destination address(es), and logging that type of traffic/access might allow me to find the source host, but I'm not sure which tool/command would be the most useful. I've seen Netflow thrown into a few responses when it comes to logging, but I'm confused with it's association of Logging, NAL, and nBAR, and how they relate to Netflow.

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• How can I read a portion of one Minecraft world file and write it into another?

  - by RapierMother

  I'm looking to read block data from one Minecraft world and write the data into certain places in another. I have a Minecraft world, let's say "TemplateWorld", and a 2D list of Point objects. I'm developing an application that should use the x and y values of these Points as x and z reference coordinates from which to read constant-sized areas of blocks from the TemplateWorld. It should then write these blocks into another Minecraft world at constant y coordinates, with x & z coordinates determined based on each Point's index in the 2D list. The issue is that, while I've found a decent amount of information online regarding Minecraft world formats, I haven't found what I really need: more of a breakdown by hex address of where/what everything is. For example, I could have the TemplateWorld actually be a .schematic file rather than a world; I just need to be able to read the bytes of the file, know that the actual block data starts always at a certain address (or after a certain instance of FF, etc.), and how it's stored. Once I know that, it's easy as pie to just read the bytes and store them.

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• Reformatting and version control

  - by l0b0

  Code formatting matters. Even indentation matters. And consistency is more important than minor improvements. But projects usually don't have a clear, complete, verifiable and enforced style guide from day 1, and major improvements may arrive any day. Maybe you find that SELECT id, name, address FROM persons JOIN addresses ON persons.id = addresses.person_id; could be better written as / is better written than SELECT persons.id, persons.name, addresses.address FROM persons JOIN addresses ON persons.id = addresses.person_id; while working on adding more columns to the query. Maybe this is the most complex of all four queries in your code, or a trivial query among thousands. No matter how difficult the transition, you decide it's worth it. But how do you track code changes across major formatting changes? You could just give up and say "this is the point where we start again", or you could reformat all queries in the entire repository history. If you're using a distributed version control system like Git you can revert to the first commit ever, and reformat your way from there to the current state. But it's a lot of work, and everyone else would have to pause work (or be prepared for the mother of all merges) while it's going on. Is there a better way to change history which gives the best of all results: Same style in all commits Minimal merge work ? To clarify, this is not about best practices when starting the project, but rather what should be done when a large refactoring has been deemed a Good Thing™ but you still want a traceable history? Never rewriting history is great if it's the only way to ensure that your versions always work the same, but what about the developer benefits of a clean rewrite? Especially if you have ways (tests, syntax definitions or an identical binary after compilation) to ensure that the rewritten version works exactly the same way as the original?

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• Very slow loading pages with router

  - by user984621

  I bought new router - this one: http://www.tp-link.com/en/products/details/?model=TL-WR841ND and the problem is, that the loading pages is so slow, even sometimes the pages aren't loaded at all. Is the same, when I have on the Mac OS or Windows. Below are the informations from the router-admin section: LAN IP Address: 192.168.2.1 Subnet Mask: 255.255.255.0 WAN IP Address: 192.168.1.100 Dynamic IP Subnet Mask: 255.255.255.0 Default Gateway: 192.168.1.254 DNS Server: 89.203.178.2 , 10.14.2.1 How can I fix this problem? Is almost impossible to use the internet this way.

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• Configuring Linux Network

  - by Reiler

  Hi I'm working on some software, that runs on a Centos 5.xx installation. I'ts not allowed for our customers to log in to Linux, everything is done from Windows applications, developed by us. So we have build a frontend for the user to configure network setup: Static/DHCP, ip-address, gateway, DNS, Hostname. Right now I let the user enter the information in the Windows app, and then write it on the Linux server like this: Write to /etc/resolv.conf: Nameserver Write to /etc/sysconfig/network: Gateway and Hostname Write to /etc/sysconfig/network-scripts/ifcfg-eth0: Ipaddress, Netmask, Bootproto(DHCP or Static) I also (after some time) found out that I was unable to send mail, unless I wrote in /etc/hosts: 127.0.0.1 Hostname All this seems to work, but is there a better/easier way to do this? Also, I read the network configuration nearly the same way, but if I use DHCP, I miss som information, for instance the Ip-address. I know that I can get some information from the commandline (ifconfig), but I dont get for instance Hostname, Gateway and DNS. Is there a commandline tool that will display this?

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