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• Windows refuses to believe printer is online unless I delete and re-add it

  - by Marcin

  I have a Canon MP560. It is online, in the sense that (a) I can connect to its internal web server; and (b) if I delete the printer in windows (windows 7), and reinstall it, windows will recognise that the printer is online, and talk to it. In all other cases, the windows and mac computers (purchased last week, running whatever is the latest and greatest mac os) in my household will simply not recognise that the printer is online. The printer is statically configured to use the same IP address, so that's not an issue. Because the printer works just fine with windows after delete and re-add, I assume that the issue with the mac is that I haven't installed whatever drivers Macs need to talk to Canon printers over a network.

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• Difference between tcp recv buffer and tcp receive window size?

  - by pradeepchhetri

  The command shows the tcp receive buffer size in bytes. $ cat /proc/sys/net/ipv4/tcp_rmem 4096 87380 4001344 where the three values signifies the min, default and max values respectively. Then I tried to find the tcp window size using tcpdump command. $ sudo tcpdump -n -i eth0 'tcp[tcpflags] & (tcp-syn|tcp-ack) == tcp-syn and port 80 and host google.com' tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes 16:15:41.465037 IP 172.16.31.141.51614 > 74.125.236.73.80: Flags [S], seq 3661804272, win 14600, options [mss 1460,sackOK,TS val 4452053 ecr 0,nop,wscale 6], length 0 I got the window size to be 14600 which is 10 times the size of MSS. Can anyone please tell me the relationship between the two.

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• Sending an Email from 2 Mail Servers

  - by Ted Smith

  We are currently attempting to move away from using a "local" mail(exchange) server to an cloud based offering for all our automated emails. The problem is that we send and receive thousands for emails a day and its uptime is quite critical so the business do not want to put all their eggs in one basket, so if we would like to use a cloud based offering(mailgun) they would like a backup if this goes down. So my question is: Would it be possible to set multpile A, TXT and CNAME records to multiple IP address so if one mail server goes down we can automatically start sending emails from the fallover(without them being blocked doing a reverse DNS lookup)? I know we will still need to adjust the MX record for incoming emails but that is acceptable to not receive emails for a short(1-2 hours) of time. Does this make sense?

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• Why my Buffalo router keeps on sending rdp, netbios, ftp, http requests?

  - by user192702

  I have the following network setup: Buffalo Router (192.168.100.1) < Watchguard XTM21 (192.168.100.13) < PC For some reason I keep on seeing the following repeating on my XTM21's Traffic Monitor. While I have enabled Port Forwarding, none of the ports reported below were enabled. Can someone let me know why I'm seeing all of these? 2013-10-19 23:37:56 Deny 192.168.100.1 192.168.100.13 ftp/tcp 4013 21 0-External Firebox Denied 60 64 (Unhandled External Packet-00) proc_id="firewall" rc="101" tcp_info="offset 10 S 282700472 win 5840" Traffic 2013-10-19 23:37:59 Deny 192.168.100.1 192.168.100.13 http/tcp 2459 80 0-External Firebox Denied 60 64 (Unhandled External Packet-00) proc_id="firewall" rc="101" tcp_info="offset 10 S 296571237 win 5840" Traffic 2013-10-19 23:38:02 Deny 192.168.100.1 192.168.100.13 8000/tcp 3244 8000 0-External Firebox blocked ports 60 64 (Internal Policy) proc_id="firewall" rc="101" tcp_info="offset 10 S 298709937 win 5840" Traffic 2013-10-19 23:38:05 Deny 192.168.100.1 192.168.100.13 8000/tcp 3244 8000 0-External Firebox blocked ports 60 64 (Internal Policy) proc_id="firewall" rc="101" tcp_info="offset 10 S 298709937 win 5840" Traffic 2013-10-19 23:38:05 Deny 192.168.100.1 192.168.100.13 rdp/tcp 3896 3389 0-External Firebox Denied 60 64 (Unhandled External Packet-00) proc_id="firewall" rc="101" tcp_info="offset 10 S 290482691 win 5840" Traffic 2013-10-19 23:38:08 Deny 192.168.100.1 192.168.100.13 netbios-ns/udp 2110 137 0-External Firebox Denied 78 64 (Unhandled External Packet-00) proc_id="firewall" rc="101" Traffic 2013-10-19 23:38:32 Deny 192.168.100.1 192.168.100.13 ftp/tcp 4025 21 0-External Firebox Denied 60 64 (Unhandled External Packet-00) proc_id="firewall" rc="101" tcp_info="offset 10 S 321868558 win 5840" Traffic 2013-10-19 23:38:35 Deny 192.168.100.1 192.168.100.13 http/tcp 2471 80 0-External Firebox Denied 60 64 (Unhandled External Packet-00) proc_id="firewall" rc="101" tcp_info="offset 10 S 325918731 win 5840" Traffic 2013-10-19 23:38:38 Deny 192.168.100.1 192.168.100.13 8000/tcp 3256 8000 0-External Firebox blocked ports 60 64 (Internal Policy) proc_id="firewall" rc="101" tcp_info="offset 10 S 327854525 win 5840" Traffic 2013-10-19 23:38:41 Deny 192.168.100.1 192.168.100.13 8000/tcp 3256 8000 0-External Firebox blocked ports 60 64 (Internal Policy) proc_id="firewall" rc="101" tcp_info="offset 10 S 327854525 win 5840" Traffic 2013-10-19 23:38:41 Deny 192.168.100.1 192.168.100.13 rdp/tcp 3896 3389 0-External Firebox Denied 60 64 (Unhandled External Packet-00) proc_id="firewall" rc="101" tcp_info="offset 10 S 327101423 win 5840" Traffic 2013-10-19 23:38:44 Deny 192.168.100.1 192.168.100.13 netbios-ns/udp 2110 137 0-External Firebox Denied 78 64 (Unhandled External Packet-00) proc_id="firewall" rc="101" Traffic

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• Heartbeat won't start up from a cold boot when a failed node is present

  - by Matthew

  I currently have two ubuntu servers running Heartbeat and DRBD. Let's say one node is down... The servers are directory connected with a 1000Mbps cross over cable on eth1 and have access to a IP camera LAN on eth0 The node that is still functioning won't start up heartbeat and provide access to the drbd resource. I have to manually restart heartbeat by "sudo service heartbeat restart" to get everything up and running. How can I get it to start fine from a cold start? Here is the my ha.cf and some material from the syslog... If I'm missing any information that might be of some help. http://pastebin.com/rGvzVSUq <--- Syslog http://pastebin.com/VqpaPSb5 <--- ha.cf

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• Creating a secure multicast tunnel with socat

  - by ams

  How we can create secure multicast tunnels ith socat? Assume that we have a list of IP address, CIDR network addresses that we want to create secure tunnel to them. I found this: socat STDIO UDP4-DATAGRAM:224.1.0.1:6666,range=192.168.10.0/24 but I want a secure tunnel and different adds with net addrs I want to create script that give the IPs and net addresses and creates a secure tunnel ./myscript IP1 NetAdd1 IP2 NetAdd2 .... How can I send these parameters to socat? Does socat multicast have any limits?

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• SSH access from outside to a pc inside network

  - by Raja

  I have a static IP and ADSL router linked to a linksys wireless router to which all my machines are connected. I would want to setup SVN on one of machines and provide SSH access which should be accessible by users outside my network. Would this be possible? Even just SVN access through web should be fine. Please let me know what all things should be done to achieve this ? I have Ubuntu VM running in a iMac Leopard machine and another 2 Win 7 32/64 bit machines. I can setup standalone Ubuntu or Win XP on another machine. Thanks, Raja.

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• Massive Crawling requests from Google Apps Engine useragent

  - by SilentPlayer

  Hi friends, I'm badly affected with 'Google AppEngine-Google' UserAgent.. receiving 5/6 requests per second on http server. This bot is crawling my site just like GoogleBot does. Following is the sample of url in my access logs. 72.14.192.3 - - [19/May/2010:01:27:06 +0000] "GET /some-url/etc-123.htm HTTP/1.1" 200 4707 "-" "AppEngine-Google; (+http://code.google.com/appengine; appid: harpy000)" I have checked the ip address it is registered with Google Inc. Can anyone tell me where i can report Abuse to Google Inc. Or any information about this issue. Thank you!

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• DNS name not on cert

  - by blsub6

  I've got an interesting one... My users have always typed in 'mail' to get to their mail. There was an internal DNS A record that resolved that to the IP of the mail server. I'm putting in an Exchange server to replace that. In order for people to get their mail, I try putting in an A record that does the same thing as the previous one. When I try to get to OWA, it tells me that the certificate on the server is not trusted. I only have the names: mail.mydomain.com autodiscover.mydomain.com autodiscover.mydomain.internal mydomain.internal mailserver.mydomain.internal so when the browser sees that this cert is trying to cover https://mail/owa it says the cert's not trusted. What amy I supposed to do about that?

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• busybox does not display the throughput value at the end of a FTP session?

  - by rockyurock

  Hello, why busybox does not display the throughput value at the end of a FTP session? Or it is some version specific ? i heard that some version of busybox displays Tput value at the end of data transfer but i know that specific version .. i typed the below command but i did not get any throughput status.. "busybox ftpget -v -u user -p Password ip abc.txt abc.txt" could anybody please let me know how can i get the tput value for UL/DL data transfer? Also how can we get the status of Tput value at the client side if we do busybox ftpput operation?? regds rocky

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• Error while setting up Anywhere Access on Windows Server 2012 Essential (personalized domain name from Microsoft)

  - by Thomas

  I am trying to setup Anywhere Access on a Windows Server 2012 Essential Release Candidate, but keep getting this error: "The domain name was not setup for your server. Wait a few minutes and run the wizard again. An unknown error occurred. Please wait a few minutes and then try again". These are the options that I selected in the Wizard: I want to set up a new domain name Get a personalized domain name from Microsoft Entered my Windows live id and password xxxx.remotewebaccess.com And on the next page the error is displayed. I have setup my router (Linksys WRT160N) to forward all TCP traffic to the Server. UPnP is also enabled. If I hit my public (dynamic) IP (http://188.182.194.182/) I get the Windows Server 2012 homepage. Any ideas?

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• Public Facing Recursive DNS Servers - iptables rules

  - by David Schwartz

  We run public-facing recursive DNS servers on Linux machines. We've been used for DNS amplification attacks. Are there any recommended iptables rules that would help mitigate these attacks? The obvious solution is just to limit outbound DNS packets to a certain traffic level. But I was hoping to find something a little bit more clever so that an attack just blocks off traffic to the victim IP address. I've searched for advice and suggestions, but they all seem to be "don't run public-facing recursive name servers". Unfortunately, we are backed into a situation where things that are not easy to change will break if we don't do so, and this is due to decisions made more than a decade ago before these attacks were an issue.

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• AWS EC2: How to determine whether my EC2/scalr AMI was hacked? What to do to secure it?

  - by Niro

  I received notification from Amazon that my instance tried to hack another server. there was no additional information besides log dump: Original report: Destination IPs: Destination Ports: Destination URLs: Abuse Time: Sun May 16 10:13:00 UTC 2010 NTP: N Log Extract: External 184.xxx.yyy.zzz, 11.842.000 packets/300s (39.473 packets/s), 5 flows/300s (0 flows/s), 0,320 GByte/300s (8 MBit/s) (184.xxx.yyy.zzz is my instance ip) How can I tell whether someone has penetrated my instance? What are the steps I should take to make sure my instance is clean and safe to use? Is there some intrusion detection techinque or log that I can use? Any information is highly appreciated.

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• Nginx Rate Limiting by Referrer?

  - by SteveEdson

  I've successfully set up rate limiting on IP addresses like so, limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; But I was wondering if its possible to do the same on referrers? For example, if a site gets placed in an iframe on a third party site, which generates too much traffic to handle. I can't find any nginx variables for the referrer anywhere. Is this possible? Or can the solution be achieved in a different way? Thanks.

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• Best Performing Remote Desktop Software for WAN

  - by Dave

  I've been tasked with connecting a computer in one of our branches in the midlands to one in south wales. We have been using windows remote desktop but find it too slow. The ADSL on the computer were connecting to is about 6Mb Download and 470Kb Upload so not majorly fast. That connection is also shared with about 10 other internet users. I'm trying to find out if the is any remote desktopn connecting software that performs better than the microsoft remote desktop software. Or, would i be better using a KVM over IP? I've looked into connecting the offices through BT's fiber optic but at £21k a year rental were trying to find a cheaper solution! Any help would be great. Thanks, Dave,

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• How to share files between cPanel accounts?

  - by Darren

  I am setting up a multi-site/multi-store Magento installation, and I want each site to have its own cPanel account so I can setup the SSL and dedicated IP properly. I have tried to create a linux group called 'magento' and changed the files I need to share to that group (even added the users to that group), however when I try to access files through my scripts on those accounts it doesn't acknowledge the files exist. I first made a soft symbolic link which didn't work and then including them to their real location but it didn't work. Am I missing a step in allowing which users can access which files? I added the users to the magento group and like I said changed the group of the files I need to share to them but it's still not working. Thanks, Darren

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• Smart subdomain routing via reverse proxy

  - by Trevor Hartman

  I have two servers on my home network: OSX Server and an Ubuntu Server. I'd love to have external subdomains osx.mydomain.com point to osx and ubuntu.mydomain.com point to ubuntu. I know the normal way to do this is to have a static external IP address for each, but that's not an option as this is just my home setup. My question is: is there a way to do this with some reverse proxy trickery? OSX is currently the default entry point for all traffic. I was able to setup a reverse proxy on OSX for ubuntu.mydomain.com on port 80, so web traffic was correctly being proxied to my ubuntu. I'd like to ssh and do a bunch of other stuff though!

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• Apache doesn't autostart because vpn isn't up yet.

  - by Col. Shrapnel

  I have a FreeBSD8 server, and VPN connection to my ISP. I use mpd5 and it works fine. A have an Apache server whch works fine, if I start it manually, after VPN is get up. But when I add it to rc.conf autostart, it fail to start, saying (49) can't assign requested address: make_sock could not bind to address I suppose it's because VPN isn't up yet and no IP address assigned to the interface which i set in the Listen directive in the httpd.conf. If i set Listen to the existing 127.0.0.1, it fail to serve wan requests. Is there a solution, either to delay apache autostart or configure it some different?

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• Web service not accessible from behind corporates firewalls - how come?

  - by Niro

  We run a Saas serving a widget which is embedded in customer websites. The service include static javascript code hosted on amazon S3 and dynamic part hosted on EC2 with Scalr (using scalr name servers). We received some feedback from users behind corporate firewalls that they cant access our service (while they can access the sites including the widget). This does not make sense to me since the service is using normal http calls on port 80 and our URL is quite new without any reason to be banned by firewalls. My questions are: 1. Why is the service is not accessible and what can I do about it? 2. Is it possible that one of the following is blocked by corporate firewalls: Amazon s3, the dynamic IP address provided by amazon, Scalr name servers. Any other possible reasons, way to check them and remedies for this? Thanks!

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• The concept of virtual host and DNS [migrated]

  - by Subhransu

  I have a dedicated server and a mydomain.com (bought from a hosting company). I want to host a website from my dedicated server with the domain mydomain.com i.e. when I enter mydomain.com from browser it should point to the IP(let's say X.X.X.X) of dedicated server(and a particular folder inside it). I have some following queries: In Server I know I need to edit some of the files (like: host or hostname file) in the server but I do not know what exact file I need to edit. How to add a Site enable or Site available in apache2 ? In Hosting Company control Panel Which records to add (A or cname or anyother)? Where Should I add DNS(in dedicated server section or domain name section)? How it is going to affect the behaviour of the domain? in short the question is: How the virtual host works & how to add DNS?

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• How Do I Change the Windows7 LAN Proxy Config from the Command Line

  - by david.barkhuizen

  In Windows7, Is it possible to define/change the proxy config from the command line ? So, using the gui, I would go: Start Control Panel Network and Internet Internet Options Connections LAN Settings and then - enable/disable the proxy - define IP:port of proxy server But I would like to rather do this from the command line (so that I can run the command from a batch-file with a shortcut key - enabling me to switch proxy configs using a short-cut, rather than having to wade through the MS wizard). I've looked at using netsh.exe to change the settings for WinHTTP, but this seems to be thr wrong thing to do, as the WinHTTP setting do not appear to be related to the LAN settings. Much appreciated folks.

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• How can I connect to a CIFS/SMB share on a non-default port?

  - by fsckin

  I'm trying to get a contractor connected to a CIFS share (port 445). He's not a big shop (so no go on using VPN). His ISP blocks outgoing connections on port 445. I've been doing some rsync to ftp madness as a workaround to have the share available to him, but it's getting out of control -- we're syncing nearly 40GB a day to an external ftp site and it's going to be much easier just to have him connect and only grab the stuff he needs. So... I can have the CIFS share open to the internet (filtered to allow access to his IP only) on port 446. How the heck can he connect to that? I looked through "net use" and didn't see anything about using another port.

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• CentOS Existing host to new host with all data/files

  - by ganesh

  Good noon. Our small startup management decided to move our production server from existing provider to azure. We have centOS on both. It is for classified's related site, considerable amount of data and ~thousands users with their disc space quota. This is our first time moving our servers. I need your Guidance and suggestions on these. 1) How to migrate the mysql db (dump OR slave OR copy filesystem)? 2) How to manage the emails during the downtime. 3) Manage the files 4) How to security/Firewall check list for the new system 5) IP/DNS related Checklist 6) Anything that I missed out!. Since first time, planning to be more cautious. Any reference documents Highly appreciated. Thank you all!.

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• D-Link DNS-323 NAS firmware update

  - by Mark Beaton

  Hi all, I've got a D-Link DNS-323 NAS enclosure holding a bunch of multimedia files that I've (possibly stupidly) just updated the firmware on, from 1.03 to 1.08. The updater indicated it applied the firmware patch successfully, but after rebooting it I can no longer get into it via the web interface, either via the static IP I had assigned it before the update, or by any of the DHCP-assigned addresses that I can see are currently assigned by my router. The unit just sits there, with the drives (2x512 set up as RAID-1) thrashing away seemingly forever... So, my question - has anyone had a similar experience with one of these units? Any advice etc? I've googled the hell out of it, and can't find anything useful.

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• Nginx. How do I reject request to unlisted ssl virtual server?

  - by Osw

  I have a wildcard SSL certificate and several subdomains on the same ip. Now I want my nginx to handle only mentioned server names and drop connection for others so that it'd look like nginx is not running for unlisted server names (not responding, rejecting, dead, not a single byte in response). I do the following ssl_certificate tls/domain.crt; ssl_certificate_key tls/domain.key; server { listen 1.2.3.4:443 ssl; server_name validname.domain.com; // } server { listen 1.2.3.4:443 ssl; server_name _; // deny all; // return 444; // return 404; //location { // deny all; //} } I've tried almost everything in the last server block, but no success. I get either valid response from known virtual server or error code. Please help.

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