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• How to install anti-virus without administrative rights?

  - by Rohit

  In situations where the PC has no CD drive and operating a guest account with limited privileges, how to install an anti-virus tool? Malware is not permitting to open any anti-virus vendor's site and also blocking all sites opened via Google that contain the term "online scan". I somehow managed to download through mirror links with a Download Manager as the browser's download was blocked by the malware. But the problem didn't end there. After I downloaded the anti-virus tool, it failed to install because it needed administrative rights. The user didn't know the administrator password. I tried via command line with runas, but it also asks for the administrator password. The OS is Windows XP. How to deal with these type of malwares if there is a scenario that CD drive is not there only Internet is there?

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• Implementing Variable Envelope Return Path (VERP) using Exchange

  - by iammichael

  We're looking into implementing Variable Envelope Return Path (VERP) for improved bounce processing for our application. Our current mail infrastructure is MS Exchange 2007 but are in the process of upgrading to 2010. We're also implementing Postini for spam filtering. Exchange doesn't support sub-addressing (see also this question on disposable addresses) -- and VERP is somewhat of a specialized application of sub-addressing. Are there any options for implementing VERP in Exchange without putting another non-Exchange SMTP relay in front of Exchange to pre-process incoming messages? Specifically could a transport rule be created that could match against the target (non-existing) recipient, store that recipient address in a special header added to the message, and redirect the message to a pre-created mailbox? Note: we have developer resources available if custom code could be used somehow.

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• XDMCP works for Solaris, not for RHEL

  - by joshxdr

  I have some old RHEL4 servers that until recently I was able to connect to remotely with Exceed (remote desktop using XDMCP) from my windowsXP PC. My PC is connected to our network by wired LAN. Recently it seems something has changed in our network. I can still connect to all the old Solaris and HPUX servers with Exceed, but for some reason I can no longer connect to the RHEL4 servers. I assume this is some kind of "security" feature turned on in our network. Does anyone know what this might be, and how I can tell IT to re-enable it? Update: A colleague has found that he can connect (very slowly) to these RHEL4 boxes with XDMCP if he is using our VPN from home, but when he is in the office using wired LAN he cannot connect to them. So it seems that there is some kind of firewall or ???, part of our wired LAN network, that is blocking XDMCP traffic from RHEL4.

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• Citadel mail server software non-DIY alternatives

  - by microspino

  I have ha VPS on webbynode with Citadel groupware suite installed, but I'm not so happy with It. I would like to try other alternatives. This is a VPS where I do tons of experiment so it's better for me to avoid any DIY solution if not extremely easy to reinstall. In fact I destroy and rebuild this VPS frequently. I just need a mail server, with spam filtering and web access. No goupware features needed. Please don't suggest me to pass through gmail. :) Could you provide me 2 or 3 alternatives?

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• Lot of Multicast traffic on LAN

  - by Nel

  Recently the whole network at work is being hit by multicast traffic originating on the LAN itself. I did some investigating and the service which seems to be responsible is ws-discovery. I have attached a screenshot of wireshark capturing the traffic. I have tried shutting down the source machine from which it was originating, but the multicast traffic still seems to be present in the network. My network topology 2 subnets - 10.10.10.0/24 and 10.20.10.0/24. Gateway is a debian system. We have 3 switches for 3 floors. They are all unmanaged Dlink 24-port switches. Multicast blocking at switch level is out of the question. Any solutions? :(

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• Strange IIS/Asp.net Exception Message

  - by Element

  I have a standard asp.net 2.0 application running on IIS 6. I have noticed some strange exception messages in the logs. They seem to be caused by random spam bots trying to submit forms. They are strange because the request string is huge and all the exception details in the event manager are messed up, they have been replaced with %21,%22, etc.. as seen in the screen shot. Is this some kind of exploit or just a bug in the asp.net exception handler/logger ? UPDATE: I traced the requests that are causing this strange log event to a bug in IE8 that causes it to request scriptresource.axd?d={html from page} as described in these links: MS Connect SO - Invalid Webresource.axd SO - IE8 Dropping Memory Pages I am still not sure why these requests would break the IIS log event like seen above, they are just long strings of jiberish being sent to the server, maybe someone reading this can shed some light on it.

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• Rewrite URL based off of IP on OpenWRT

  - by Scott

  We are running OpenWRT on a WRT54GL. I have been looking for an answer to this, but I can't seem to figure out what to search for, if its possible, or what combination of programs to use. I want to be able to redirect a HTTP request from a WiFi device based off of their MAC address. This should all be transparent to the device. Basically we are trying to redirect any non-registered devices to a website to register the device (at this point, we would push a new config to the router that would allow this MAC address "full access"). Once a device is registered, it will be redirected to a transparent squid proxy server on another machine for caching/blocking certain sites. I looked at tinyproxy - popilo which redirects but I won't have the MAC address to know if its registered or not. Any help (google suggestions, programs, anything!) would be very much appreciated!

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• Configure IIS 7 Reverse Proxy to connect to TeamCity Tomcat

  - by Cynicszm

  We have an IIS 7 webserver configured and would like to create a reverse proxy for a TeamCity installation using Tomcat on the same machine. The IIS server site is https://somesite and I would like the TeamCity to appear as https://somesite/teamcity redirecting to http://localhost:portnumber I have installed the IIS URL Rewrite extension from http://www.iis.net/download/URLRewrite and the Application Request Routing from http://www.iis.net/download/ApplicationRequestRouting to try and setup a reverse proxy but can't get it working. The closest answer I found is an old StackOverflow question http://stackoverflow.com/questions/331755/how-do-i-setup-teamcity-for-public-access-over-https which unfortunately doesn't have a working example. I've searched a quite a bit but can't seem to find a relevant example. Any help appreciated (apologies for the bold but the spam prevention won't let me post more than 1 hyperlink)

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• How to block a program from using IPv4?

  - by Ian Boyd

  I have a program that can communicate over IPv4 (TCP and UDP) and over IPv6 (TCP and UDP). I want to block the program from being able to use IPv4. I tried the Windows Firewall: Except it blocks IP sub-protocols (e.g. TCP, UDP, encapsulated IPv6, GRE), rather than blocking IPv4 itself. In other words, I need to block IPv4: IPv4/TCP IPv4/UDP IPv4/ICMPv4 IPv4/GRE IPv4/L2TP while allowing IPv6: IPv6/TCP IPv6/UDP IPv6/ICMPv6 IPv6/GRE IPv6/L2TP Can I block a program from using IPv4? Note: If it cannot be done, then don't be afraid to add that as an answer. There's no shame in giving the correct answer to a question.

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• Port forwarding does not work always?

  - by ITFan

  I opened port 25374, this is eMule TCP port, then I use canyouseeme.org to check if it is really opened. I got the weird problem : when eMule is running, canyouseeme.org see my port. I got the message : "Success: I can see your service on xxx.xx.xxx.xx on port (25374) Your ISP is not blocking port 25374" When I close eMule then check the port again on canyouseeme.org I got : Error: I could not see your service on xxx.xx.xxx.xx on port (25374) Reason: Connection timed out But when I turn off the windows firewall I got a different error : Error: I could not see your service on xxx.xx.xxx.xx on port (25374) Reason: Connection refused Can anyone please explain to me why it happened like that and how to make the port always opened ? Thanks

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• Chatbox/shoutbox/forum with the following features.

  - by Mick

  I would like to set up a simple forum for a small number of users. The features I would like are the following, in order of priority: logging on not compulsory for posting. A single thread. All the messages are immediately visible - no need to "open" them. most recent message at the top by default. The ability to give selected users the power to delete spam messages. The ability to upload photos. Avatars. Configurable skins/size/shape. So far the closest I have come is www.tag-world.com but there are no avatars and no photos.

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• Postfix - Unable to receive emails from certain domains

  - by Emmanuel

  Got a Postfix-Dovecot-Saslauthd setup on Ubuntu 10.04. Problem is there's (at least) one domain that it refuses to accept emails from. I've been getting emails fine from lots of different domains except one. It's really weird, but could some config file or something be blocking certain domains? or IPs? or something? I know the emails are being sent to me, infact I sent a test one myself from this domain and they're just not showing up.

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• apache2 slow responding (debian)

  - by baloo

  I'm running an apache2 2.2.9 webserver with modpython and mpm_worker_module. The current config for the mpm is ServerLimit 32 StartServers 10 MaxClients 800 MinSpareThreads 25 MaxSpareThreads 75 ThreadsPerChild 25 MaxRequestsPerChild 0 The server has 1G of ram and a 100Mbit connection. Checking netstat -na | grep ESTABLISHED | wc -l gives me a number between 50 - 60. The load is about 1.0 Every pageload is also cached by memcached. I can't see why the server is so slow in responding to new connections, sometimes droping them completely? Also tried disabling iptables to make sure it's not because of a full state table or something like that. The only thing in dmesg is a lot of spam about "TCP: Treason uncloaked!"

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• How should I setup separate mx records for a subdomain?

  - by Chris Adams

  Lets say I have a domain that I run a web app on, for example cranketywidgets.com, and I'm using google apps for handle email for people work work on that domain, i.e. support@ cranketywidgets.com, [email protected], [email protected] and so on. Google's own mail services aren't always the best for sending automated reminder emails, comment notifications and so on, so the current solution I plan to pursue is to create a separate subdomain called mailer.cranketywidgets.com, run a mail server off it, and create a few accounts specifically for sending these kinds of emails. What should the mx records and a records look like here for this? I'm somewhat confused by the fact that mx records can be names, but that they must eventually resolve to an A record. What should the records look like here? cranketywidgets.com - A record to actual server like 10.24.233.214 cranketywidgets.com - mx records for google's email apps mailer.cranketywidgets.com - mx name pointing to server's ip address Would greatly appeciate some help on this - the answer seems like it'll be obvious, but email spam is a difficult problem to solve.

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• remote desktop over wireless

  - by tbischel

  So I'm trying to run remote desktop on my laptop to connect to my home desktop. I have a problem where this works fine if I connect my laptop with an ethernet cable, but fails when I try to use wireless internet access (which works fine for normal internet surfing). I've experienced this problem at home with my wireless router, and at work with the wireless network they have there, so I'm inclined to believe that its a setting local to my machine rather than the router blocking the requests... but I'm not sure where to look. Any suggestions?

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• MySQL port 3306 blocked in csf yet can still telnet to port 3306 from external host

  - by Neek

  We have a Centos 6 VPS that was recently migrated to a new machine within the same web hosting company. It's running WHM/cPanel and has csf/lfd installed. csf is set up with mostly vanilla config. I'm no iptables expert, csf has not let me down before. If a port isn't in the TCP_IN list, it should be blocked on the firewall by iptables. My problem is that I can telnet to port 3306 from an external host, yet I think iptables ought to be blocking 3306 because of csf's rules. We are now failing a security check because of this open port. (this output is obfuscated to protect the innocent: www.ourhost.com is the host with the firewall problem) [root@nickfenwick log]# telnet www.ourhost.com 3306 Trying 158.255.45.107... Connected to www.ourhost.com. Escape character is '^]'. HHost 'nickfenwick.com' is not allowed to connect to this MySQL serverConnection closed by foreign host. So the connection is established, and MySQL refuses the connection due to its configuration. I need the network connection to be refused at the firewall level, before it reaches MySQL. Using WHM's csf web UI I can see 'Firewall Configuration' includes a fairly sensible TCP_IN line: TCP_IN: 20,21,22,25,53,80,110,143,222,443,465,587,993,995,2077,2078,2082,2083,2086,2087,2095,2096,8080 (lets ignore that I could trim that a little for now, my concern is that 3306 is not listed in that list) When csf is restarted it logs the usual slew of output as it sets up iptables rules, for example what looks like it blocking all traffic and then allowing specific ports like SSH on 22: [cut] DROP all opt -- in * out * 0.0.0.0/0 -> 0.0.0.0/0 [cut] ACCEPT tcp opt -- in !lo out * 0.0.0.0/0 -> 0.0.0.0/0 state NEW tcp dpt:22 [cut] I can see that iptables is running, service iptables status returns a long list of firewall rules. Here is my Chain INPUT section from service iptables status, hopefully that's enough to show how the firewall is configured. Table: filter Chain INPUT (policy DROP) num target prot opt source destination 1 acctboth all -- 0.0.0.0/0 0.0.0.0/0 2 ACCEPT tcp -- 217.112.88.10 0.0.0.0/0 tcp dpt:53 3 ACCEPT udp -- 217.112.88.10 0.0.0.0/0 udp dpt:53 4 ACCEPT tcp -- 217.112.88.10 0.0.0.0/0 tcp spt:53 5 ACCEPT udp -- 217.112.88.10 0.0.0.0/0 udp spt:53 6 ACCEPT tcp -- 8.8.4.4 0.0.0.0/0 tcp dpt:53 7 ACCEPT udp -- 8.8.4.4 0.0.0.0/0 udp dpt:53 8 ACCEPT tcp -- 8.8.4.4 0.0.0.0/0 tcp spt:53 9 ACCEPT udp -- 8.8.4.4 0.0.0.0/0 udp spt:53 10 ACCEPT tcp -- 8.8.8.8 0.0.0.0/0 tcp dpt:53 11 ACCEPT udp -- 8.8.8.8 0.0.0.0/0 udp dpt:53 12 ACCEPT tcp -- 8.8.8.8 0.0.0.0/0 tcp spt:53 13 ACCEPT udp -- 8.8.8.8 0.0.0.0/0 udp spt:53 14 LOCALINPUT all -- 0.0.0.0/0 0.0.0.0/0 15 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 16 INVALID tcp -- 0.0.0.0/0 0.0.0.0/0 17 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 18 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:20 19 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:21 20 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22 21 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:25 22 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:53 23 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:80 24 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:110 25 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:143 26 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:222 27 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:443 28 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:465 29 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:587 30 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:993 31 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:995 32 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2077 33 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2078 34 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2082 35 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2083 36 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2086 37 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2087 38 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2095 39 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2096 40 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:8080 41 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:20 42 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:21 43 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:53 44 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:222 45 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:8080 46 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 8 47 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 0 48 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 11 49 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 3 50 LOGDROPIN all -- 0.0.0.0/0 0.0.0.0/0 What's the next thing to check?

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• Win7 Prof. Computer won't wake on lan via Magic Packet from outside network

  - by Michael

  Hi all. I just purchased a new computer running Windows 7 Professional x64. I'd like to save power by having it sleep after an hour, but I would also like to be able to Remote Desktop into it at my leisure. I set up a static IP and have port forwarding set up on the router. If the computer is awake, the RDP connection works just fine. I downloaded and installed Wake-On-Lan thanks to this article If I put my new computer to sleep and send the magic packet from my old computer inside of my home network it wakes up. If I do the same thing, however, from my work computer outside the network it does not. I figured the Firewall was blocking the incoming traffic, but nothing in the Windows Firewall logs points to this happening. I'm wondering if anyone has any suggestions or any tests I can run through in order to narrow down what the problem might be. Thanks in advance for any help you might be able to offer.

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• Suppress EXT3-fs warning on mount

  - by STM

  I am familiar with output suppress on Unix machines, ie: cat /file/that/doesnt/exist > /dev/null 2>& However I can't seem to suppress the output of mount when an ext3 filesystem is mounted for the nth time, and it recommends an fsck. As it happens, fscks are run regularly by another machine, so these warning messages are needlessly interrupting the flow of output to my pretty bash script. These are the errors: # mount -t ext3 /dev/sda1 /mnt > /dev/null 2>& kjournald starting. Commit interval 5 seconds EXT3-fs warning: maximal mount count reached, running e2fsck is recommended EXT3 FS 2.4-0.9.19, 19 August 2002 on sd(8,1), internal journal EXT3-fs: mounted filesystem with ordered data mode. Can anyone shed some light on this? I'm clearly blocking both fd's, but somehow output is still getting through. This is GNU Bash v2.05a

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• Mouse button and keypress counter for Linux?

  - by rakete

  I would like to have some kind of statistic of my daily mouse/keyboard usage to help me make my keyboard layout a little bit more efficient. There is already an question about how to do this on windows, but I would like to know I anyone is aware if this is possible under linux. Another thing I already found is key-mon, a little program for screencasts that displays your mouse and keyboard presses on the screen, which would help me achieve what I want with a little bit of python coding by myself. But still, if there was an solution already, that would be easier of course. PS: obfuscated link to key-mon because of spam prevention: hxxp://code.google.com/p/key-mon/

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• Mystery "users" email group

  - by dangowans

  This morning, our entire company received a spam message sent to [email protected], where "ourdomain.on.ca" is our actual domain. There is a distinguished name that this could correspond to: CN=Users,DC=ourdomain,DC=on,DC=ca Looking at the attributes though, there is no mail, no proxyAddresses, no signs that there is a mailbox configured there. I did some LDAP queries, searching for: (proxyAddresses=smtp:[email protected]) ([email protected]) But am not seeing any records. (I also search for known email addresses to ensure the tree was being searched properly.) We are running Exchange 2003. Is there another place to look for group email addresses? Is it possible that the distinguished name is being automatically translated to an email address?

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• Better performance with memcached cluster or local memcaches?

  - by Nicholas Tolley Cottrell

  I have a small cluster of servers balancing a Java web app. Currently I have 3 memcached servers caching data and all web apps shares all 3 memcached instances. I often get strange slowdowns and timeouts to some of the memcacheds and I wondering if there is a good way of analyzing the performance. I am wondering whether my iptables rules (or some other system limitation) are blocking/slowing connections. I am considering reconfiguring the web apps so that they only query the memcached process on their own localhost.

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• Port Forwarding: Why do my local sites on 80 work but not those on 8080?

  - by Chadworthington

  I setup my router to forward port 80 to the PC hosting my web site. As a result, I am able to access this url (Don't bother clicking on it, it's just an example): http://my.url.com/ When i click on this link, it works: http://localhost:8080/tfs/web/ I also forward port 8080 to the same web server box But when I try to access this url I get the eror "Page Cannot be displayed:" http://my.url.com:8080/tfs/web/ I fwded port 8080 the same way I fwded port 80. I also turned off Windows Firewall, in case it was blocking port 8080. Any theories why port 80 works but 8080 does not?

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• Is there a lightweight MTA for Ubuntu 9.10 Desktop?

  - by Joe Casadonte

  I'm writing a Perl script to run as a cron job, and I want to email results & errors to a local account on the laptop. I'd like something that can talk SMTP (do any MTAs not adhere to SMTP?). I use Thunderbird 3, so I'll also need a POP/IMAP server (unless T-Bird can read straight from an mbox file; I'll have to check into that). No need for spam controls as I'll lock it down real tight, only accepting mail originating from the laptop itself. Thanks!

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• Hosts that allow email marketing?

  - by Ghost1227

  I work for a company that heavily relies on email marketing to make money and we're running into a problem. We are trying to spin up a new email server and are finding it difficult to find a hosting company that doesn't explicitly disallow any form of mass mailing, legitimate or otherwise! Our lists are all opt-in, so the legitimacy issues aren't a problem, and we comply 100% with CAN-SPAM laws, but that doesn't seem to matter to hosting companies. Does anyone else have experience in this market? Can anyone suggest hosting companies that either support ESPs or are at least mass-mailing friendly? I've done lookups on most of the big players in the field and it seems that all of them are hosting their own equipment, which is currently cost prohibitive for us.

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• Can connect to shared folder on Windows Server 2012, but access denied when accessing

  - by Cylindric

  I have a Windows Server 2012 (non-domain) with a folder that's shared out as TestShare. The share permissions are Everyone has full access, and there is a local user TestUser that has full access to the actual folder. On GuestServer I can connect and/or map a drive to \HostServer\TestShare, specifying the username and password for TestUser. NTFS permissions: Share permissions Effective Access Report The problem is that when I try to access the folder, I get an "access denied" message. On the host server I can see the user connected to the share in the Sessions manager, so the password is correct and being recognised. If I use an incorrect password I don't get the "completed successfully" message, nor the 'open session'. What else can be blocking access to the shared files, when the share seems to be set, and the folder permissions seem to be set, and the connection seems to be okay? The network is recognised as "public", and the relevant firewall rules seem to be enabled - even disabling the firewall doesn't help.

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