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• Printing to shared printers across VPN

  - by CYMR0

  I have a program that prints labels at five remote sites. Two sites, aren't working, but the rest are with an identical (as far as I can tell) setup. Using Wireshark, I have determined that the handshaking all goes well, but after the "Open Print File Response" the packet that is sent from the server, doesn't reach the client. But I'm a bit at a loss as to where I go from here. I know the port the packet was sent on (445) isn't being blocked, the RST packet gets sent on the same port and that gets there fine. It's also weird that the three out of five sites are working fine. This has been up and running for years without issue, all that we have changed is our connectivity (from DSL to bonded DSL). But this traffic is over a VPN - so it can't be the ISP interfering either can it? I'm totally stuck, and any help would be much appreciated. Thanks!

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• mail server administration

  - by kibs

  MY postfix does not show that it is listening to the smtp daemon getting mesaage below: The message WAS NOT relayed Reporting-MTA: dns; mail.mak.ac.ug Received-From-MTA: smtp; mail.mak.ac.ug ([127.0.0.1]) Arrival-Date: Wed, 19 May 2010 12:45:20 +0300 (EAT) Original-Recipient: rfc822;[email protected] Final-Recipient: rfc822;[email protected] Action: failed Status: 5.4.0 Remote-MTA: dns; 127.0.0.1 Diagnostic-Code: smtp; 554 5.4.0 Error: too many hops Last-Attempt-Date: Wed, 19 May 2010 12:45:20 +0300 (EAT) Final-Log-ID: 23434-08/A38QHg8z+0r7 undeliverable mail MTA BLOCKED OUTPUT FROM lsof -i tcp:25 command master 3014 root 12u IPv4 9429 TCP *:smtp (LISTEN) (Postfix as a user is missing )

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• How do I set "relay_hosts_only" setting using sendmail / m4

  - by Dave

  We're using CentOS and sendmail's m4 configuration. How do I set domains where emails should be delivered? I only want two domains, and would like email to all other domains blocked. I tried this in my "/etc/mail/sendmail.mc" file ... FEATURE(`relay_hosts_only,mydomain1.com,mydomain2.com')dnl But then got this error tryiing to generate the sendmail.cf file ... [dalvarado@mymachine ~]$ sudo m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf m4:/etc/mail/sendmail.mc:156: Warning: excess arguments to builtin `include' ignored m4:/etc/mail/sendmail.mc:156: cannot open `/usr/share/sendmail-cf/feature/relay_hosts_only': No such file or directory Thanks for your advice, - Dave

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• FTP error 424 failed to establish connection

  - by cKK

  Getting "ftp error 425 failed to establish connection" when trying to connect to ftp server. Tried 2 ftp clients on 3 machines on same network and none work. However FTP works from home / mobile broadband. No ip blocks on ftp sever. Other ftp servers(differrent ip/hosts) work okay. firewall setup correct, no ports blocked. Is it possible to use a proxy for ftp a i think it's something with the ISP but taking too long to fix?

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• Is there a way to set up an SMTP relay that allows users of a web app to have the web app send email

  - by mic

  the web service sends out emails on behalf of the users to their customers. So [email protected] uses webservice and webservice sends emails . The emails should be appearing as coming from [email protected]. Currently what we are trying to do is to configure webservice to act as an email client for each user, each user being able to create their own profile in which they need to configure their smtp server credentials. But given that there are more options for configurations than you can shake your stick at -not to mention trying to explain to users what info to get from where, POP b4 smtp, TLS, SSL, AUTH,etc) I am wondering if there could be a different way. How, if at all could this be approached? Can I set up a postfix server to do what I need to without running into another admin. nightmare or being blocked for spamming? Thank you for your insights

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• How to config DNS onto TCP from UDP

  - by Dante Jiang

  Google DNS (8.8.8.8 and 8.8.4.4) are blocked (or polluted) by all ISPs available to me (and DNS by ISPs just return wrong answers for some sensitive sites!!), and it is said that if we change DNS from UDP onto TCP, the problem can be temporarily solved. My question is: how to config that on Windows 7? The solution provided by the original post: Windows 7 Ultimate DnsApi.dll v6.1.7601.17570 .text:6DC08FC8 8B 46 10 mov eax, [esi+10h] .text:6DC08FCB 89 45 F4 mov [ebp+var_C], eax var_C - 2 85A0: 90 90 90 90 90 -> 33 C0 40 EB 25 85C8: 8B 46 10 -> EB D6 40 I have not figure out how the original solution works so far. It needs to modify the .dll file, and the post provides a .dll after modification. However, I wish there was a solution without this kind of hacking.

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• FTP error 425 failed to establish connection

  - by cKK

  Getting "ftp error 425 failed to establish connection" when trying to connect to ftp server. Tried 2 ftp clients on 3 machines on same network and none work. However FTP works from home / mobile broadband. No ip blocks on ftp sever. Other ftp servers(differrent ip/hosts) work okay. firewall setup correct, no ports blocked. Is it possible to use a proxy for ftp a i think it's something with the ISP but taking too long to fix?

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• What ports do I need open for IMAP connections

  - by iamjonesy

  I'm developing a web application that connects to an IMAP mailbox and fetches emails as part of it's functionality. The application is PHP and I'm connecting like this: public function connect() { /* connect to gmail */ $hostname = '{imap.gmail.com:993/imap/ssl}INBOX'; $username = $this->username; $password = $this->password; /* try to connect */ $this->inbox = imap_open($hostname,$username,$password) or die('Cannot connect to Gmail: ' . imap_last_error()); } Developing locally on my mac this was fine, I was able to connect and get emails. However now that I've put the app on my web hosts server I'm getting the following error: Cannot connect to Gmail: Can't connect to gmail-imap.l.google.com,993: Connection timed out After checking with my hosting provider they told me outgoing connections on port 993 are blocked. Is there anyway around this? Otherwise I need to upgrade to a dedicated server :S

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• Setup routing and iptables for new VPN connection to redirect **only** ports 80 and 443

  - by Steve

  I have a new VPN connection (using openvpn) to allow me to route around some ISP restrictions. Whilst it is working fine, it is taking all the traffic over the vpn. This is causing me issues for downloading (my internet connection is a lot faster than the vpn allows), and for remote access. I run an ssh server, and have a daemon running that allows me to schdule downloads via my phone. I have my existing ethernet connection on eth0, and the new VPN connection on tun0. I believe I need to setup the default route to use my existing eth0 connection on the 192.168.0.0/24 network, and set the default gateway to 192.168.0.1 (my knowledge is shaky as I haven't done this for a number of years). If that is correct, then I'm not exactly sure how to do it!. My current routing table is: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface MSS Window irtt 0.0.0.0 10.51.0.169 0.0.0.0 UG 0 0 0 tun0 0 0 0 10.51.0.1 10.51.0.169 255.255.255.255 UGH 0 0 0 tun0 0 0 0 10.51.0.169 0.0.0.0 255.255.255.255 UH 0 0 0 tun0 0 0 0 85.25.147.49 192.168.0.1 255.255.255.255 UGH 0 0 0 eth0 0 0 0 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0 0 0 0 192.168.0.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0 0 0 0 After fixing the routing, I believe I need to use iptables to configure prerouting or masquerading to force everything for destination port 80 or 443 over tun0. Again, I'm not exactly sure how to do this! Everything I've found on the internet is trying to do something far more complicated, and trying to sort the wood from the trees is proving difficult. Any help would be much appreciated. UPDATE So far, from the various sources, I've cobbled together the following: #!/bin/sh DEV1=eth0 IP1=`ifconfig|perl -nE'/dr:(\S+)/&&say$1'|grep 192.` GW1=192.168.0.1 TABLE1=internet TABLE2=vpn DEV2=tun0 IP2=`ifconfig|perl -nE'/dr:(\S+)/&&say$1'|grep 10.` GW2=`route -n | grep 'UG[ \t]' | awk '{print $2}'` ip route flush table $TABLE1 ip route flush table $TABLE2 ip route show table main | grep -Ev ^default | while read ROUTE ; do ip route add table $TABLE1 $ROUTE ip route add table $TABLE2 $ROUTE done ip route add table $TABLE1 $GW1 dev $DEV1 src $IP1 ip route add table $TABLE2 $GW2 dev $DEV2 src $IP2 ip route add table $TABLE1 default via $GW1 ip route add table $TABLE2 default via $GW2 echo "1" > /proc/sys/net/ipv4/ip_forward echo "1" > /proc/sys/net/ipv4/ip_dynaddr ip rule add from $IP1 lookup $TABLE1 ip rule add from $IP2 lookup $TABLE2 ip rule add fwmark 1 lookup $TABLE1 ip rule add fwmark 2 lookup $TABLE2 iptables -t nat -A POSTROUTING -o $DEV1 -j SNAT --to-source $IP1 iptables -t nat -A POSTROUTING -o $DEV2 -j SNAT --to-source $IP2 iptables -t nat -A PREROUTING -m state --state ESTABLISHED,RELATED -j CONNMARK --restore-mark iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j CONNMARK --restore-mark iptables -t nat -A PREROUTING -i $DEV1 -m state --state NEW -j CONNMARK --set-mark 1 iptables -t nat -A PREROUTING -i $DEV2 -m state --state NEW -j CONNMARK --set-mark 2 iptables -t nat -A PREROUTING -m connmark --mark 1 -j MARK --set-mark 1 iptables -t nat -A PREROUTING -m connmark --mark 2 -j MARK --set-mark 2 iptables -t nat -A PREROUTING -m state --state NEW -m connmark ! --mark 0 -j CONNMARK --save-mark iptables -t mangle -A PREROUTING -i $DEV2 -m state --state NEW -p tcp --dport 80 -j CONNMARK --set-mark 2 iptables -t mangle -A PREROUTING -i $DEV2 -m state --state NEW -p tcp --dport 443 -j CONNMARK --set-mark 2 route del default route add default gw 192.168.0.1 eth0 Now this seems to be working. Except it isn't! Connections to the blocked websites are going through, connections not on ports 80 and 443 are using the non-VPN connection. However port 80 and 443 connections that aren't to the blocked websites are using the non-VPN connection too! As the general goal has been reached, I'm relatively happy, but it would be nice to know why it isn't working exactly right. Any ideas? For reference, I now have 3 routing tables, main, internet, and vpn. The listing of them is as follows... Main: default via 192.168.0.1 dev eth0 10.38.0.1 via 10.38.0.205 dev tun0 10.38.0.205 dev tun0 proto kernel scope link src 10.38.0.206 85.removed via 192.168.0.1 dev eth0 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.73 metric 1 Internet: default via 192.168.0.1 dev eth0 10.38.0.1 via 10.38.0.205 dev tun0 10.38.0.205 dev tun0 proto kernel scope link src 10.38.0.206 85.removed via 192.168.0.1 dev eth0 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.73 metric 1 192.168.0.1 dev eth0 scope link src 192.168.0.73 VPN: default via 10.38.0.205 dev tun0 10.38.0.1 via 10.38.0.205 dev tun0 10.38.0.205 dev tun0 proto kernel scope link src 10.38.0.206 85.removed via 192.168.0.1 dev eth0 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.73 metric 1

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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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• SQL Server Express Uninstall / Enterprise Install Issue

  - by user19049

  I need help installing SQL Server 2005 Enterprise edition.I really need to remove the current SQL Server 2005.installation that is no longer on my Add/Remove software list but yet still installed on the machine. I tried to uninstall SQL Server Express / Developer Edition but it only removed it from my Add/Remove software list. It returned immediately but did NOT actually remove the product. (I'm now in a bad state.) i tried to install SQL Server 2005 Enterprise and its says I'm blocked as all components are already installed - but they are not. How can I remove all instance of previous one and install clean Enterprise edition on my server Thanks

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• PSAD Firewall/ UDP flood?

  - by Asad Moeen

  Well I'm actually trying to block a UDP Flood on the Application port because the string "getstatus" is causing my application to make large output due to a small input to the attacker's IP. I installed PSAD firewall to do the job. psad -S shows 3000,000 logged packets at the application port and top ports in Scan but does not block the IP of the attacker however other IP Addresses with small number of connections are dropped. I'm thinking that since output is also being made to the attacker, this is why its not getting blocked because iptables rate-limiting is also exactly doing the same thing and not blocking the IP where outgoing connection is also made. Any guesses why it won't work?

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• Windows 2008 Routing and Remote access server - access to the internet

  - by Ian

  I have a windows 2008 r2 remote access server set up and running. The remote access works fine. My problem is that the remote access server itself doesn't have access to the internet. The box has two interfaces, an internal and an external. Inbound connections come in on the external interface and RRAS responds. All wall and nice. I want to be able to use windows update, browse, etc from this box but can't as the outbound traffic just gets blocked. I've tried going into the RRAS mmc tool and opening the interface properties, under which there are two buttons for inbound and outbound filters. There I tried adding ports 80 and 443, but this doesn't work completely. I can see the connection initiating (Syn goes out) but the session never establishes itself. Anyone done this or got any suggestions?

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• What is the method to reset the Planar 1910m monitor?

  - by Richard J Foster

  My monitor (a Planar, apparently model number PL1910M) is not working. (It is flashing a green / orange sequence which I believe to be an error code. The sequence, in case it helps consists of orange and green three times quickly followed by a longer orange, then another green followed by a long period where both colors appear to be present). I vaguely recall a co-worker suffering from a similar problem, and our IT department "resetting" the monitor by holding down a certain set of keys as they apply power. Unfortunately, I do not remember what that key sequence was, our IT department is not responding, and the Planar web site is blocked by the content filtering firewall we have in place! What is the sequence to perform the reset? (For bonus geek-credit, what does the code mean... as if it indicates a blown component clearly a reset will not help me. ;-))

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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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• webmin not working on port 10000

  - by Ali

  Hi, I posted a similar question yesterday but can't seem to find that post. I have installed webmin on my server which has SSL and its service is running but I am unable to open it in browser. I thought may be the port is blocked by server's firewall so I entered port 10000 (TCP - inbound) in APF but still no luck. When I use https://localhost:10000 on server to access webmin then it works fine but not remotely. Why is such a simple thing so hard to run? Thanks

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• What ports tend to be unfiltered by boneheaded firewalls?

  - by Reid

  Hi all, I like to be able to ssh into my server (shocking, I know). The problem comes when I'm traveling, where I face a variety of firewalls in hotels and other institutions, having a variety of configurations, sometimes quite boneheaded. I'd like to set up an sshd listening on a port that has a high probability of getting through this mess. Any suggestions? The sshd currently listens on a nonstandard (but < 1024) port to avoid script kiddies knocking on the door. This port is frequently blocked, as is the other nonstandard port where my IMAP server lives. I have services running on ports 25 and 80 but anything else is fair game. I was thinking 443 perhaps. Much appreciated! Reid

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• Can't connect to YouTube from specific network

  - by Tyilo

  Using my current network, I am unable to connect to http://www.youtube.com/. It doesn't matter what browser I use or if I use a cli-command (wget, curl). Error in Google Chrome: Oops! Google Chrome could not connect to www.youtube.com Error using curl: curl: (7) couldn't connect to host If I use nslookup to get the IP-address of YouTube, I get 173.194.32.32. If I go to http://173.194.32.32/ in my browser it can connect, but as Google is probably checking the Host HTTP-header, it shows Google's frontpage instead. There is no blocked websites on the router and other devices on the network seems to work. My computer only has this problem on this specific network. I am using Mac OS X 10.8.2 on a MacBook (mid 2009).

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• connect to ssh server thru 80 via HTTP proxy?

  - by im_chc

  Hi, Please help: I want to connect to my ssh server at home However, I'm behind a corporate (CORP) firewall, which blocks almost all ports (443, 22, 23 etc). But it seems that 80 is not blocked, coz I am able to surf the web after I login (i.e. IE sets to CORP's proxy server, and start IE - displayed CORP intranet portal - type in google.com - dialog pops up for userid + pwd - login successful, and surf without restrictions) My ssh server listens at 443. My question is: Is there a way to connect from a computer behind the CORP firewall to the ssh server thru the 80 port, with the ssh server still listening on port 443? Changing the ssh server to listen to port 80 is not an option, coz my home ISP blocks 80. Can I use a public proxy which listens at 80? After some research on google I found that there is something called "connect to SSH thru an HTTP proxy" using the Cockscrew software. Is it useful? Or is there some other way to solve the problem?

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• How do I overclock a dual core processor?

  - by Pankaj Bhardwaj

  This is a serious problem. I want to speed up my compilation process. I have never been especially fond of overclocking, however my current compilation time for my project makes my crazy! I found information about which parameters I should change to overclock and which values are safe. However, I have one basic problem. I don't have the ability to change this option in my BIOS. It is possible that these options have been blocked by the system administrators? Getting a faster processor is not an option. How do I edit the proper values to overclock my CPU. Do I need to flash my bios to another version? My specs: Entium Dual-Core Cpu E5400 @2.7GHz Asrock motherboard 4GB RAM Windows 7 Ultimate 32-bit

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• Security measures for CentOS

  - by cappuccinodrinker

  I have been tightening up my web server security and wanted to know what else I can do. I am running CentOS 5 with these measures: - All passwords to FTP, MySQL etc are generated from grc.com/passwords.htm and microsoft.com/protect/fraud/passwords/create.aspx (for the ones which cannot be too long). - Running iptables with all ports shut off except for http mail and smtp, the important ports like FTP SSH are blocked to all except my static office IP. There is also no response to pings. - Rootkit Hunter running daily - The server is PCI compliant according to Comodo - Not running any crappy made php apps, we use Zend Framework for our stuff and do have kayako installed and keep them up to date. Can't really think of anything else I can do... I could implement a brute force measure, but I think I already have by simply changing my SSH port to a number above 10000 and blocking it off with iptables.

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• qmail questions - whitelisting and relays

  - by Richard

  My new server runs qmail, which I've never used before. There is no inbound mail on the server (all the clients have mail hosted elsewhere, but some systems on the server send mail. I'm about to move a client there who has several parked domains, and looking at the smtp log, the server is already blocking many attempts to relay spam using one of the parked domain names (probably because a related domain is already hosted there). How do I ensure those mails stay blocked, while allowing legitimate addresses to send out? Server OS is CentOS and hosting software is Kloxo.

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• Outlook 2010 Error

  - by Trevor Sullivan

  I'm running Outlook 2010 SP1 on Windows 7 x64 SP1, and I'm getting an error message saying "Your Microsoft Exchange administrator has blocked the version of Outlook that you are using. Contact your administrator for assistance." I'm still able to log into my account using Outlook Web Access (OWA), so I know that my account is working just fine. Outlook 2010 with Service Pack 1 is the standard for Windows 7 client systems at this organization, and other people are able to access their e-mail just fine. When my account was initially configured, I was able to use Outlook for a couple of days, and then it suddenly stopped working, providing only the above error message. Do you have any ideas on what I should look into to resolve this problem? Is there any information I can obtain on the client side that will help the Exchange folks investigate the issue further? Is there any verbose logging I can enable, or diagnostic logging in Outlook? Cheers

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• Problem whit usb wireless mouse

  - by aiacet

  Recently i have thi problem whit my wireless mouse (Trust model on: www.trust.com/15313). Sometimes when i start the Pc or during a game the pointer/arrow stop to move it. In the Pc start the pointer is blocked on the center of the screen. If I'm lucky i have to chance the USB wirless adapter from port 1 to port 2 but sometimes this trick doesn't work i to use the mouse i have to restart. Like you can see in the productor webpage this mouse don't have the direver but only a tool to solve some problem. Thank you in advance to all the "super-users" that reading this question would be help me Ajax

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• Do I need to have a proxy server to have HTTP over SSH?

  - by Johnes thomas

  I want to use HTTP over SSH since in my university most of the sites are blocked. I have my own server to which I can using SSH. What I'm doing right now is have a squid proxy run on the server on a particular port. Then connect using putty to my server via ssh and create a tunnel from a certain local port (which I will enter as proxy server in Firefox) to the squid server. So in putty the configuration is like this for the tunnel: source port:8080 destination:localhost:3128 I want to know is there any other way other than running the squid proxy on my server to tunnel the packets? Thanks.

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