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• What ports to open for mail server?

  - by radman

  Hi, I have just finished setting up a Postfix mail server on a linux (ubuntu) platform. I have it sending and receiving email and it is not an open relay. It also supports secure smtp and imap. Now this is a pretty beginner question but should I be leaving port 25 open? (since secure smtp is preferred). if so then why? Also what about port 587? Also should I require any authentication on either of these ports? Please excuse my ignorance in this area :P

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• mail refused by port 25

  - by shantanuo

  When I try to send a mail from my Linux (CentOS) server, the exit status is 0, but the mail never reaches it's destination. The /var/log/maillog file has an entry something like this... Mar 18 06:33:01 app11 postfix/qmgr[22454]: F18FD9F6074: to=<[email protected]>, relay=none, delay=0.01, delays=0/0/0/0, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to alt4.gmail-smtp-in.l.google.com[74.125.45.27]: Connection refused) Am I blocked by google? I tried to send a mail to some other mail server and got the similar result. Mar 18 06:33:01 app1 postfix/smtp[15460]: connect to acsinet11.xxx.com[111.222.333.444]: Connection refused (port 25) How do I correct this problem?

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• Quick change of SSH tunnel port forwarding options for SOCKS proxy

  - by user1335897

  The goal is to have access to internet thru SSH tunneling to SOCKS proxy. Me - ssh-on-my-vps - SOCKS proxy - internet Thing is I want to be able to quickly change the SOCKS proxy in this chain. If I use port forwarding on ssh, I assume I have to re-establish SSH tunnel with new SOCKS proxy address in parameters whenever I want to change proxy. Is that right? If it is, then I probably should always point SSH tunnel to localhost listening proxy server which will send requests to specified SOCKS proxy. So what local proxy I should choose that allows to easily change the destination SOCKS proxy via maybe reading from local file where I would put the SOCKS proxy address or via specifying new SOCKS address in its web-admin page?

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• Network with bridge and port forwarding?

  - by rafek

  Hi! Below is my current (and planned) home network configuration. I would like to connect my non-wifi-capable desktop to my home network. The question is: HOW? What device do I need? The primary requiremen is that I need to be able to forward ports to my desktop. How would I achieve this? Is there something like "double port forwarding"? Could anyone please explain this configuration to me? Thank you in advance!

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• Filtering serial port io

  - by mr odus

  I am currently working on a project where I communicate with hardware via a com port on its respective pc(win xp or 7) It is a fairly large project and sifting through the log file can be a bit of pain. This is my current setup. I use putty to do the actual serial communication, and write it to a log file. Then using MinGW Msys I filter it using tail -f "puttyLog" | grep -i "search term" Is there a better way to do this? I mean specifically filtering the input in realtime. Not that mine is terrible, but it still involves having to read from a log and sometimes there have been hangups where it will be delayed for a minute or 2. I have used software in the past with a main io window and then internal filter panels, but can no longer remember or find it.

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• Limiting and redirect port access with useragent

  - by linuxcore

  I'm trying to write iptables string match rule To block http://domain.com:8888 and https://domain.com:8888 when it matches the supplied string in the rule. And another rule to redirect the ports also from 8888 to 7777 I tried following rules but unfortunately didn't work iptables -A INPUT -p tcp -s 0.0.0.0/0 -m string --string linuxcore --algo bm --sport 8888 -j DROP iptables -t raw -A PREROUTING -m string --algo bm --string linuxcore -p tcp -i eth0 --dport 8888 -j DROP iptables -t nat -A PREROUTING -p tcp --dport 8888 -m string --algo bm --string "linuxcore" -j REDIRECT --to-port 7777 iptables -A INPUT -t nat -p tcp --dport 8888 -m string --algo bm --string "linuxcore" -j DROP I want to do this from iptables not the webserver because the server may not have a webserver and those ports are working on internal proxy or something like ..etc

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• Transferring videos from Sony Video Camera to PC via USB connection

  - by Mehper C. Palavuzlar

  I have a Sony video camera (DCR-TRV340e) and loads of video tapes that I like to transfer to my PC. The camera has USB connection and I've loaded its driver with no problems. Which video software do you recommend me to use? I want to have my videos in XviD format with maximum 1 GB for a 1 hour film. How much time does it take to do that for a 1 hour film? Should I use USB connection or another type of connection? Detailed information about connection and software settings would be highly appreciated.

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• Windows Server 2008 constantly spamming external IP's on outbound TCP port 445

  - by RSXAdmin

  Hi Server Fault, I have a Windows Server 2008 box running as a Domain Controller. I have noticed in my Cisco ASA firewall logs that this box is continuously sending out (like a thousand requests a second) requests on TCP port 445 to external hosts. I have made an effort to deny this outbound traffic from getting on the internet (using the ASA), however I would like these requests to stop from even occurring at all. I have tried disabling TCP/IP over NetBIOS. I have even turned on Windows Advanced Firewall on the box itself to block outbound 445 but the ASA still detects this particular traffic hitting it. I have other DC's and similar type boxes which are not behaving the same way as this box. Is this normal? Is there a way to stop this spamming? Have I been infected? Thank you universe.

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• how to forward IP request to a specific port

  - by Jeremy Talus

  I have 2 servers the first (SRV01) is running Bind and other web app the second (SRV02) is running 2 server Minecraft (^^) in Bind I have 2 A recording for the 2 server MC s1.domain.tld A SRV02IP s2.domain.tld A SRV02IP the 2 MC serv are running on 2 different port 25565 and 25566 so I want that the request from s1.domain.tld:25565 are going to SRV02IP:25565 and the request from s2.domain.tld:25565 are going to SRV02IP:25566 I think I need do this in the SRV02 iptables. I have looking some topic about iptables but nothing pertinent to me. could you help me ? rgds.

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• port forwarding using 3 static ip addresses

  - by Danny

  I am new to configuring routers. We have purchased a RV016 Cisco business router that has multiwan capability. What we are attempting to do is take map services from 3 different servers and assign 3 different static IP addresses and then forward port 80 through the router. A short term solution to building a proxy server. Is this possible? Right now we have a consumer grade Cisco router and assign a static IP and it works, we attempted the same settings on the business router and cannot get to the internet. We set it DHCP and it works fine, however we want to to forward the static ports not use DHCP.

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• create a bootable usb to automatic repair windows xp system32 files

  - by Edo Post

  Is it possible to create a script/live distro that replaces some system32 files? To explain it a bit more in details: There is a company that has multiple computers (think in 100/1000's) and they all are missing the same system32 files since the company's software removed it. The systems are distributed all over the world and are managed by "normal" people who don't have any knowledge about computers. I want to create a usb stick that i can mail to all those people which contains a script that executes when you boot the usb. this script should replace the missing system32 files without any user input is this possible, and if so how could i manage this?

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• Proxy the traffic in http and https from my iPhone/iPad to VirtualBox on my Mac

  - by Nicolas BADIA

  I've got a mac running a Debian VirtualBox which forward the traffic from 8080 on the mac to 80 in the box and from 8443 to 443. The domains with the extension .dev are redirected on the mac to 127.0.0.1 with dnsmasq. The traffic on IP 127.0.0.1 is forwarded from 80 to 8080 and from 443 to 8443 using ipfw. So with this settings, my Debian VirtualBox gets all the traffic of my .dev domains in http or https. What I want is to be able to proxy the traffic of my .dev domains in http and https from my iPad to my Debian VirtualBox on the mac. I've try to setup an HTTP proxy on the ipad but I can only do it for one port (and it's not working with the port 443). Any idea on how I could achieve that ?

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• Blocking IP address with port forwarding

  - by Jeff Storey

  I have a website setup behind a router, so the router has the external facing address and it will forward requests to the webserver inside the network. If there are X number of invalid login attempts, that IP address will be blocked from logging in. The problem is that because the site is being accessed through port forwarding, all requests show up as though they are coming from the router address, and thus the router address becomes the blocked IP. I'm not sure if this is a limitation of the router (linksys wrt160n) or if this a more general issue. Is there a way to handle this?

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• Network with bridge and port forwarding?

  - by rafek

  Hi! Below is my current (and planned) home network configuration. I would like to connect my non-wifi-capable desktop to my home network. The question is: HOW? What device do I need? The primary requiremen is that I need to be able to forward ports to my desktop. How would I achieve this? Is there something like "double port forwarding"? Could anyone please explain this configuration to me? Thank you in advance!

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• Windows 2008 - Define IP Order by port or service

  - by Josh

  I have a Windows 2008 server that has three IP bound to the NIC. I can select which IP Windows SMTP listens to, but I want to also set the IP address used when mail is sent. Where would I set which outbound IP to use when sending email? Without using real IPs, here is an example what I have setup. Three IPs associated with the server: 10.0.0.1 10.0.0.2 10.0.0.3 I setup the binding on 10.0.0.2 for port 25 in the SMTP server settings, so that it is the only IP that will respond for inbound. When I look at the email header from an email sent from that server, it lists the server with an address of 10.0.0.3. I would like it to use 10.0.0.2 so that when reverse DNS is performed, it maps back correctly.

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• nginx proxy pass redirects ignore port

  - by Paul

  So I'm setting up a virtual path when pointing at a node.js app in my nginx conf. the relevant section looks like so: location /app { rewrite /app/(.*) /$1 break; proxy_pass http://localhost:3000; proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } Works great, except that when my node.js app (an express app) calls a redirect. As an example, the dev box is running nginx on port 8080, and so the url's to the root of the node app looks like: http://localhost:8080/app When I call a redirect to '/app' from node, the actual redirect goes to: http://localhost/app

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• Can't install Ubuntu 12 into VirtualBox (USB not recognized, ISO would not boot)

  - by wvxvw

  I'm trying out VirtualBox 4.18 and wanted to install Ubuntu 12 as a test. After installing VirtualBox (on Debian squeeze/sid), creating a virtual machine for Ubuntu and pointing it in Settings Storage IDE Controllers to the ISO with the proper version of Ubuntu, checked the "Live CD" option. Tried to define the IDE as master / slave, primary / secondary - all to no effect, and trying to boot this system, I'm getting to the screen which says: FATAL: could not read from the boot medium! System halted I've copied the same ISO to the USB stick, and I can boot from the USB (outside VirtualBox). I've looked at couple of tutorials / walk-through, there's nothing I can see that I would've done wrong. So, how would I configure it to boot from the desired ISO? Below is the snapshot with the current settings (sorry, I don't know how to get them as text).

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• postfix cannot send email

  - by AKLP

  I'd like to mention that im really new to this so please bear with me. I'm trying to setup a forum software to send emails via postfix but I think my server has the port 25 blocked. I tried running these: works: ping alt2.gmail-smtp-in.l.google.com don't work: telnet alt2.gmail-smtp-in.l.google.com 25 telnet 66.249.93.114 25 tried flushing iptables and then using these rules but didn't work either: sudo iptables --flush sudo iptables -P INPUT ACCEPT sudo iptables -P OUTPUT ACCEPT sudo iptables -P FORWARD ACCEPT sudo iptables -F sudo iptables -X doing a telnet on 25 port to localhost url works but nothing when telnet'ing in none local urls. mail.log: Oct 17 01:20:24 webhost postfix/smtp[3642]: connect to alt2.gmail-smtp-in.l.google.com[2607:f8b0:400e:c03::1a]:25: Connection timed out Oct 17 01:20:24 webhost postfix/smtp[3643]: connect to alt2.gmail-smtp-in.l.google.com[2607:f8b0:400e:c03::1a]:25: Connection timed out Oct 17 01:20:24 webhost postfix/smtp[3642]: 4744380032: to=<[email protected]>, relay=none, delay=2892, delays=2741/0.03/150/0, dsn=4.4.1, status=deferred (connect to alt2.gmail-smtp-in.l.google.com[2607:f$

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• Windows 7 is blocking ports

  - by Caleb1994

  I am trying to open port 80 and 3690 for HTTP and svnserve respectively. I have Windows Firewall off, and have tried temporarily disabling Mcafee VirusScan Enterprise, to no avail. According to http://www.yougetsignal.com/tools/open-ports/, both ports 80 and 3690 are still blocked. I can't think of what would be blocking them if Windows Firewall and my antivirus are disabled. Here is the output of netsh firewall show state Firewall status: ------------------------------------------------------------------- Profile = Standard Operational mode = Disable Exception mode = Enable Multicast/broadcast response mode = Enable Notification mode = Enable Group policy version = Windows Firewall Remote admin mode = Disable Ports currently open on all network interfaces: Port Protocol Version Program ------------------------------------------------------------------- 3690 TCP Any (null) 22 TCP Any (null) 80 TCP Any (null) 1900 UDP Any (null) 2869 TCP Any (null) Any help? I'm not sure what each item on the list of enabled/disabled items is, but "Operational Mode" is disabled, so I assume that one refers to me disabling Windows Firewall. I know that since Windows Firewall is off, this output might not be useful, but I figured I'd include it just in case, haha.

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• Windows 7 is blocking ports

  - by Caleb1994

  I am trying to open port 80 and 3690 for HTTP and svnserve respectively. I have Windows Firewall off, and have tried temporarily disabling Mcafee VirusScan Enterprise, to no avail. According to http://www.yougetsignal.com/tools/open-ports/, both ports 80 and 3690 are still blocked. I can't think of what would be blocking them if Windows Firewall and my antivirus are disabled. Here is the output of netsh firewall show state Firewall status: ------------------------------------------------------------------- Profile = Standard Operational mode = Disable Exception mode = Enable Multicast/broadcast response mode = Enable Notification mode = Enable Group policy version = Windows Firewall Remote admin mode = Disable Ports currently open on all network interfaces: Port Protocol Version Program ------------------------------------------------------------------- 3690 TCP Any (null) 22 TCP Any (null) 80 TCP Any (null) 1900 UDP Any (null) 2869 TCP Any (null) Any help? I'm not sure what each item on the list of enabled/disabled items is, but "Operational Mode" is disabled, so I assume that one refers to me disabling Windows Firewall. I know that since Windows Firewall is off, this output might not be useful, but I figured I'd include it just in case, haha.

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• Exchange 2007 OWA not listening on SSL port

  - by krs1

  I have an Exchange 2007 server that went down after a power failure. It has OWA access via SSL both externally and internally. OWA is working fine from the internal notwork, however I am getting a timeout when I attempt to connect externally. I pulled up wireshark and noticed that the server actually redirects to SSL. For some reason the server is not listening on the SSL port, and this seems to be causing the timeout. I normally do only development work, but I'm stuck with this since my sysadmin took off for the week and isn't answering my phone calls. As far as I know it shouldn't be a firewall issue. Aside from me not wanting to work on the damn thing, what should I look for?

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• 2 virtual domains: one on port 80 one on port 8080, how?

  - by Simone

  I've been struggling with this, basically what I want is this: A virtual domain to run on the 80 another virtual domain to run FROM 80 TO 8080 what I've done so far is trying different combinations with apache, but all i got is having all the virtual domains pointing to port 80 this is my conf: <VirtualHost domain1.com:80> DocumentRoot /var/www/domain1 <Directory "/var/www/domain1"> allow from all Options +Indexes </Directory> ServerName domain1.com </VirtualHost> <VirtualHost server.domain2.com:80> DocumentRoot /var/www <Directory "/var/www"> allow from all Options +Indexes </Directory> ServerName server.domain2.com ServerAlias www.server.domain2.com ProxyPass / http://server.domain2.com:8080/ </VirtualHost> suggestions? :(

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• blocking port 80 via iptables

  - by JoyIan Yee-Hernandez

  I'm having problems with iptables. I am trying to block port 80 from the outside, basically plan is we just need to Tunnel via SSH then we can get on the GUI etc. on a server I have this in my rule: Chain OUTPUT (policy ACCEPT 28145 packets, 14M bytes) pkts bytes target prot opt in out source destination 0 0 DROP tcp -- * eth1 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW,ESTABLISHED And Chain INPUT (policy DROP 41 packets, 6041 bytes) 0 0 DROP tcp -- eth1 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW,ESTABLISHED Any guys wanna share some insights?

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• Exchange server listening on port 25 but clients dont recieve emails

  - by Josh R

  My exchange server is listening on port 25, that is I can telnet into it and send an email but Outlook 2010/2007, OWA, and ActiveSync are not pulling down emails. Outlook 2010 specifically says Connected To Exchange Server and Updating Inbox but it never updates the inbox. Also, OWA shows some of the newer mail messages, but when I double click on one to open it up in OWA, it times out. Any idea what could be causing this? Also Exchange Transport and Information Store are started. Thanks!

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• How to access both partitions on a bootable USB flash drive in Windows

  - by Maccyjam

  I have a 16GB USB Flash Drive that is partitioned into two different sizes. The first partition contains a bootable version of Ubuntu, the second partition is for general saving of files. Windows will only recognise the first partition. I have tried using Bootice but this breaks the bootable partition. Disk Management recognises the second partition but does not allow me to do anything with it. Is there a way to make both partitions accessible by Windows and keep the USB disk bootable?

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