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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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• Mesh Networked servers via vpn

  - by microspino

  I got a design idea and I would like to have some advice from SF about It. I have 5 customers with small real-estate databases. I've built for them a desktop app and now they would like to merge their database to share their data. I don't want to centralize everything in one place nor I want to do maintenance for servers. They told me also, that all of them in their offices, have little servers and maintenance guys available. Although everything seems suitable for web application, I had the idea to experiment something new: Any customer small-server wild be connected to the others in a sort of mesh network without a single point of failure and through VPNs. If one of the servers went down the customers could still connect to their databases from one of the other mesh networked servers instead of from the local one that is down. During normal operations all the servers sync the db with the others through VPNs. I can accept a half-day timing window of NON synched data, in other words, since I don't need real time synchronization, the server don't have to always stay in synch. I can migrate my data over to other Non-Sql technologies like CouchDB or Redis or whatever you suggest. As you can see I don't have a lot of constraints and although I could go with a web application I would like to delegate and decentralize support, data-privacy and management, as more as I can to my customers offices. Is that a crazy idea? Do you know If something similar exist? Which technology would you suggest?

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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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• 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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• 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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• 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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• Serve mirrored (static) web-page with original headers

  - by aioobe

  I have a dynamic webpage which I want to create a "frozen" copy of. Typically I would do something like wget -m http://example.com, and then put the files in the document root of the web-server. This site however has some dynamic content, including dynamically generated images, for instance http://example.com/company/123/logo This means that in order to mirror the page, I need to Save whatever headers the server currently serves for each URL. This can be done using the wget option --save-headers. Serve the static pages and serve the proper headers for each file. (This I have no idea of how to do.) What is the best way to solve this? Any suggestions are welcome.

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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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• Service or software to auto-sync one server to another so they are identical?

  - by Ryan

  We have a main node in a DC data center and want to setup a back-up node in Seattle. The back-up node will only be used if the DC node goes down and we switch it over while DC node is repaired. The question is, what kind of services out there allow me to sync the data, I suppose we want to do it fairly frequently so if something goes down there isn't much loss in data between the time of failure and the last back-up/sync. Is there any common solution for this? It's Windows Server 2003 running Parallels Virtuozzo.

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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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• How do I mirror a MySQL database?

  - by user45745

  I'm running two load balanced servers for one website, and I'd like the databases to be synchronized. Queries may be run on either of the two servers because they are both production sites, so the replication can't just work one way. It doesn't have to be in real-time, just fairly accurate so people don't notice a difference when they get switched to a different server.

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• wget recursively with -np option still ascends to parent directory

  - by vectra

  tl;dr: will `wget --no-parrent -r ' download from a directory above the given url's directory? when using wget to download, say images, recursively from example.com/a/b with the -r and -np options, will a picture that is under example.com/a/c/ be downloaded when example.com/a/b/ delivers a html-file containing a link to the picture? if so, how do i get all pictures, that are in a folder and it's subfolders and only those? the description of the option --no-parent says "Do not ever ascend to the parent directory when retrieving recursively". anyway directory browsing delivers a link to the parent directory, which wget will follow, despite mentioned option. now what did i miss? edit: using GNU Wget 1.12

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• Issue with broken disk on Solaris with raidctl - how to proceed

  - by weismat

  I have a SunFire T2000 server which has 2 mirrored disks pairs. The server required an exchange of the system battery. After swaping the battery first no disks were found. After booting from CD we managed to find the disks, but now one disk is broken and the raidctl reports a failed synchronisation. The boot process stops now when trying to mount the file systems. The power light of the broken drive is not even blinking. What is the best way to proceed now ? Fortunately I could live with loosing the data on the drive as it is backed up, but I would like to keep the rest of the data as it contains /etc and get the server booting again.

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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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• Why does my simple Raid 1 backup storage perform really slow sometimes?

  - by randomguy

  I bought 2x Samsung F3 EcoGreen 2TB hard disks to make a backup storage. I put them in Raid 1 (mirror) mode. Made a single partition and formatted it to NTFS, running Windows 7. For some reason, accessing the drive's contents (simply by navigating folders) is sometimes really slow. Like opening D:/photos/ can sometimes take several seconds before it starts showing any of the folder's contents. Same applies for other folders. What could be causing this and what could I do to improve the performance? I remember that there was an option somewhere inside Windows to choose fast access but less reliable persistence operations (read/write). It was a tick inside some dialog. At the time, it felt like a good idea to take the tick away from the option and get more reliable persistence but slower access, but now I'm regretting. I'm unable to find this dialog.. I've looked hard. I don't know, if it would make any difference. Oh, and I've ran scan disk and defrag on the drive. No errors and speed isn't improved.

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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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• 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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