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• VPS with multiple domains, can EXIM send mail from a different domain?

  - by Mike L.

  I building a site for a client on a VPS running CentOS 5.5 with cPanel WMH 11.28.60. The original domain is XXXXXinvestmenttrust.com. He has about a dozen domains on this server. The site I am building will have confirmation emails as well as provide users to anonymize their email address (like craigslist) I set up email piping to forward emails, but they are all being trapped in the spam folder. A close look at the headers, the emails appear to be comming from [email protected] rather than the actual domain. The IP has a rating of Neutral on www.senderbase.com. I believe it is the conflicting information in the header (the fields set by me, specify the actual domain where the headers put in place by EXIM specify to name of the server) Somewhere I read about SPF & MX entries can fix this, but I have been unable to figure out how. Also, All of the domains use the same IP, and the other websites do not send emails. So I could possibly make the domain in question, the primary (where all emails are sent from that domain by default) Is that possible?

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• Using Windows as a gateway to the internet

  - by James Wright

  My customer currently blocks outbound RDP and SSH, which means that none of their employees can get access to external Windows and Linux boxes (at the console level). However, a need has recently arisen to give access to an assortment of RDP and SSH endpoints scattered throughout the internet. The endpoint IP addresses are a moving target, and an access list exists to define what those IP addresses are. So now my customer wants to have a single Windows Server that they control as the sole outbound point for RDP/SSH to the internet. Consider it a jump box to the internet. If one of our admins have an access to this Windows box then they can log on, and from there bounce around to RDP/SSH endpoints on the internet. Is a standard Windows 2008 box going to work as a jump box? For example, I seem to recall that Win2k8 limits the number of users that can log on simultaneously, which means that the jump box may not be accessible if lots of users are on it. Advice as to how to make this work..?

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• "Server not found" errors all over after Wordpress installation

  - by picardo

  I uploaded my Wordpress blog from my local machine to Slicehost and then pointed the domain name to the IP address. Then I installed the blog as normal. Once I went to wp-login.php to login, though, I started getting "Server not found" errors. That was strange because the server process was still running, and I checked many times. I can't see anything wrong in the error log, or the access log either. This doesn't only affect Wordpress. I can't access phpmyadmin either now, which was mapped to a subdirectory of the same domain address. What is going on? Can anyone help? Edit: the blog is located on a subdomain. It's still accessible from IP address. The virtual host configs are ServerName and ServerAlias, both set to blog.mysite.com. When I changed those and restarted apache, phpmyadmin came back. Edit: also it's not a propagation issue because I installed the blog from the domain name. It's only when I tried to log into the admin section, I started getting these errors.

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• named responding recursive on norecurse queries

  - by Keks

  I have a server on which named is running. It is intercepted with another named server which it is not aware of. Querying the first named server results in timeouts. The server tries to resolve the query recursively. During that the firewall redirects the DNS Request from the first named server to the second one (the query from the first one is addressed to a e.g. a root server and has its "Recursion desired" bit set to 0). Despite that the second named responds to this request with a entirely or at least 1 level more resolved response than the first named server expects. So it ends up with a timeout even though it got a correct name server or even the full IP for the queried domain. In the first case the first name server tries to follow the authority domain ignoring the coresponding glue record and ends up in a loop it aborts: queried: google.com -> got from named#2: ns1.google.com -> ignore glue record and query: ns1.google.com -> got authority from named#2: google.com In the second case it ignores the answer section with the correct IP and instead tries to follow the name servers from the authority section, which ends up in the same dead end as case 1. So how can it be that the second named responds with recursive results even though the bit was explicitly set to 0 in the request from the first named?

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• Website always having DNS problems

  - by Root

  I moved my website from shared hosting to VPS. When it was in shared hosting all I did is updated my name servers whereas now I got my own VPS server and I used one of my domain sjdpublishing.com as the primary domain for my VPS. I created nameservers as ns1.sjdpublishing.com and ns2.sjdpublishing.com and then my actual website is creativeproperty.com.au which are pointing to ns1.sjdpublishing.com and ns2.sjdpublishing.com I am having repeated problems with my domain creativeproperty.com.au a few weeks back I had a problem which was resolved by flushing DNS and later I got similar problem which was not resolved by flushing DNS, I posted a question here and someone answered me to go to Network Settings in my MAC OSX and remove the IP as in my MAC terminal nslookup creativeproperty.com.au points to my router IP and I fixed this problem Now many of my clients were complaining that they are having same troubles accessing my website. I don't know whether its to flush DNS or change network settings or other issues. Can anyone please check my domain creativeproperty.com.au and sjdpublishing.com are having correct records or not and also can anyone tell me the best solution for this issue?

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• Linux Centos 6 becomes unavailable from time to time - OS&network issue

  - by adoado0

  I am encountering following problem. There is one server (DL160 G5) running Centos 6.3 with default kernel 2.6.32-220.2.1.el6.x86_64 - at this point I'd like to add that issue appeared also at older version - 6.1 and older kernel (do not remember exactly which version). There is cPanel installed and from time to time it becomes unavailable (network connection). What I've checked is (via KVMoIP): load average is completely normal it does not lack memory or disk space when problem occurs no console notifications checked all access logs and there is no sign that it can be caused by a client script cannot even access local interface (127.0.0.1) or main IP address running tcpdump I can only see packets arriving to server - no responses all services seem to be running properly (mail,sql,http,ssh) checked crontab and all clients' crontabs too network port utilisation is low ( up to several Mbits) arriving packet rate is low - hundreds per second (according to tcpdump) console (via kvmoip) works fine, no lags there is no conntrack at this server there is no ipv6 at this server flushing iptables, unloading modules does not resolve problem restarting network does not resolve problem, no errors appear it also occurs when two sepearate networks are configured (and multiple gateways) as well as one IP, one default gw and one network is configured - so it seems network configuration independent it seems to repeat randomly (load,packet rate,bandwith usage,load independent) checked server with different rootkit detection tools - it seems to be clean server has been rebooted, it did not change anything there are no interface errors it apperas randomly can be once a week or several times per day It usually works fine after 1-15 minutes. What I can also check? It is definitely OS issue - there is traffic at interface only in one direction when problem occurs, can not even ping loopback. Any ideas? Recommended checks? Anything I did not checked above.

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• Why Are SPF Records Failing?

  - by robobobobo

  Ok I've been going through various different sites, resources and topics here trying to figure out what is wrong with my SPF records but no matter what I do they don't seem to pass. Here's what I have "v=spf1 +a +mx +ip4:217.78.0.92 +ip4:217.78.0.95 -all" I've tried multiple different tools to check my spf records, some give me a pass, some don't. But I can't send mail to certain google app accounts, they just bounce back all the time which is very annoying. Anyone got any ideas? I have noticed that the source IP address is not the IPV4 addresses I've defined, but Cpanel wouldn't let me add that address into it.. And here's the result of tests I'm getting back from port25.com. I'm running WHM by the way and have enabled spf and dkim. Summary of Results SPF check: fail DomainKeys check: neutral DKIM check: pass Sender-ID check: fail SpamAssassin check: ham Details: HELO hostname: server1.viralbamboo.com Source IP: 2a01:258:f000:6:216:3eff:fe87:9379 mail-from: ###@viralbamboo.com SPF check details: Result: fail (not permitted) ID(s) verified: smtp.mailfrom=###@viralbamboo.com DNS record(s): viralbamboo.com. SPF (no records) viralbamboo.com. 13180 IN TXT "v=spf1 +a +mx +ip4:217.78.0.92 +ip4:217.78.0.95 -all" viralbamboo.com. AAAA (no records) viralbamboo.com. 13180 IN MX 0 viralbamboo.com. viralbamboo.com. AAAA (no records) DomainKeys check details: Result: neutral (message not signed) ID(s) verified: header.From=###@viralbamboo.com DNS record(s): DKIM check details: Result: pass (matches From: ###@viralbamboo.com). ID(s) verified: header.d=viralbamboo.com Canonicalized Headers: content-type:multipart/alternative;'20'boundary="4783D1BE-5685-41CF-B91B-1F15E91DD1E3"'0D''0A' date:Mon,'20'1'20'Jul'20'2013'20'21:30:47'20'+0000'0D''0A' subject:=?utf-8?Q?test?='0D''0A' to:"[email protected]?="'20''0D''0A' from:=?utf-8?Q?Rob_Boland_-_Viralbamboo?='20'<###@viralbamboo.com'0D''0A' mime-version:1.0'0D''0A' dkim-signature:v=1;'20'a=rsa-sha256;'20'q=dns/txt;'20'c=relaxed/relaxed;'20'd=viralbamboo.com;'20's=default;'20'h=Content-Type:Date:Subject:To:From:MIME-Version;'20'bh=CJMO7HYeyNVGvxttf/JspIMoLUiWNE6nlQUg5WjTGZQ=;'20'b=;

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• Single application through OpenVPN tunnel (Debian Lenny)

  - by user14124

  I'm using Debian Lenny and I want to tunnel rtorrent only through a OpenVPN tunnel. I have a tunnel running, the config file looks like this: client dev tun proto udp remote openvpn.xxx.com 1194 resolv-retry infinite nobind persist-key persist-tun ca /etc/openvpn/xxx/keys/ca.crt cert /etc/openvpn/xxx/keys/client.crt key /etc/openvpn/xxx/keys/client.key tls-auth /etc/openvpn/xxx/keys/tls.key 1 ns-cert-type server comp-lzo verb 3 auth-user-pass script-security 3 reneg-sec 0 My idea is that I could run a sockd proxy internally that redirects traffic to the openvpn tunnel. I could use the *nix "proxifier" application "tsocks" to make it possible for rtorrent to connect through that proxy (as rtorrent doesn't support proxies). I have trouble configuring sockd as my IP inside the VPN changes every time I connect. This is a config file someone said would help: http://ircpimps.org/sockd.conf As my IP changes at each connect I don't know what to put in that config file. I have no control over the host side config file. Any help wanted. Any other method is very welcome.

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• Google MAIL not arriving - relay not allowed

  - by renevdkooi

  I have a server with sendmail, hosting my domain mind-zone.nl, i changed the MX records to point to the server. When I use Hotmail or any other client the email arrives and everything is fine. ONLY mail from GMAIL server is bounced and gmail returns "relay denied". I have set all the virtual server host settings etc, from command line I can send mails as well, hotmail works, etc. Just not gmail. The strange thing is, this is what gmail returns: Look at the lower part: "Received by" it returns some IP address which is not mine and has absolutely nothing with my domain. While when I do a NSLOOKUP and change to google's DNS server it will state that the IP Address for my domain is correctly pointing at my server. Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 554 554 5.7.1: Relay access denied (state 14). ----- Original message ----- MIME-Version: 1.0 Received: by 10.14.37.138 with SMTP id y10mr3421504eea.43.1297665573901; Sun, 13 Feb 2011 22:39:33 -0800 (PST) Received: by 10.14.29.75 with HTTP; Sun, 13 Feb 2011 22:39:33 -0800 (PST)

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• Router as primary DNS server, Server as alternate? (or vice versa)

  - by Jakobud

  We have a very small business network, with a typical cable modem hooked into a DD-WRT router. We also run a basic CentOS server that does a variety of things, including acting as the primary DNS server for the office. The reason we need an internal DNS server is because we do a lot of internal web development and use the DNS server to add/remove various local network URLs for internal website testing (like www.testsite.com.local). It's very important for us to be able to add/remove URL aliases easily to the DNS. The problem with this setup is that if we ever need to restart the CentOS server or take it offline for upgrades or whatever, then internet access for all computers on the network is lost. That's because each computer relies on that DNS server to access the Internet I guess? The router is online all the time and very very rarely has to be restarted. It would be nice if we could setup my router to be the primary DNS server but still be running DNS on my server. So we could still add my local testing website URLs to the DNS server in CentOS, but be able to also take down the CentOS server without loosing Internet access on the network. How would this be setup? Would I simply need to add both router + server IP addresses to each computer's IP settings? Is the router primary DNS and server secondary DNS server? Or vice versa? Or can one of the two serve as a fallback for the other? What (if anything) needs to be configured on both the router and server in order for them to recognize that the other DNS server exists on the network? Does anyone have any newb-friendly resources for setting up something like this?

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• Logging communication between two VMs

  - by sYnfo

  Hi, I'm trying to set up "malware lab" described in this paper. So far, I've set up Windows guest system, adding one Host-only Network adapter, and setting this (sorry if the names aren't exactely correct, I don't have an english language version): - IP Address - 10.0.0.3 - Subnet mask - 255.255.255.0 - Default gateway - not set - Preferred DNS - 10.0.0.4 - Alternate DNS - not set And a Linux guest system - Ubuntu 9.04 - with two Network adapters - Bridged (eth0) and Host-only (eth1), and setting eth1 IP Address to 10.0.0.4, leaving the eth0 to be set by DHCP. Then, I have configured iptables as described in the paper, ie.: iptables -F -t nat iptables -F -t mangle iptables -t mangle -P PREROUTING ACCEPT iptables -t mangle -P OUTPUT ACCEPT iptables -t nat -P PREROUTING ACCEPT iptables -t nat -P POSTROUTING ACCEPT iptables -t nat -P OUTPUT ACCEPT iptables -t mangle -A PREROUTING -i eth0 -j ACCEPT iptables -t mangle -A PREROUTING -p udp -i eth1 -d 10.0.0.3 --dport 53 -j ACCEPT iptables -t mangle -A PREROUTING -p tcp -i eth1 --dport 80 -j ACCEPT iptables -t mangle -A PREROUTING -p tcp -i eth1 -d 10.0.0.3 --dport 6000:7000 -j ACCEPT iptables -t mangle -A PREROUTING -i eth1 -j ULOG iptables -t mangle -A PREROUTING -i eth1 -j DROP Now, when I try to ping the windows system from within the Linux system, it does not reply, I guess thats perfectly normal, because iptables is blocking ping responce. Same when I try to ping the Linux system from within the Windows. But when I try to access any web page from within the Windows system, I would expect that this action should get logged by iptables. But thing is, I don't see any of that kind of lines in log file (If I am looking in the right place, that is. :) It is at /var/log/messages, isn't it?). So, what do you think might be the problem here? I should note, that this is the first time I'm using linux, so don't expect ANY working knowledge of Linux at all... :) Also, since english is not my mother tongue, feel free to point out any gramatical mistakes... :) Thanks for any advice.

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• Intranet machines refuse to talk anymore

  - by ashes999

  I have two machines on the local intranet. They used to be able to talk to each other (ping, share files, etc.). Both are not successfully connected to the internet. The problem machine (lets call it test machine) can't talk to my main machine. The test machine can ping other machines on the intranet (at least one of my coworkers), but not mine. Odd. When I try to ping it from my machine, by machine name, I get Destination host unreachable. Both machines are on the intranet, with the network configured as Work Both machines have Windows Firewall disabled temporarily Both machines can talk to the internet (Google, SO, etc.) Neither machine can ping the other I need help resolving this. What I really want to achieve, is to remote into the test machine from my main machine, like I used to be able to do a few weeks ago. Some notes: Tried arp -a on both machines. I don't see the other machine's IP listed. Both machines have stable IPs; neither seems to have an IP conflict The configuration under ipconfig /all on my main machine mathces my coworker's machine. The test machine can ping his machine, but not my machine. The target machine times out trying to ping the main machine; the main machine gives me Destination host unreachable. I have rebooted both machines (several times) to no avail I have /release and /renewed both machines several times

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• Setting up DNS using BIND

  - by dupdupdup

  i have troubles setting up my db files. Please kindly point me in the right direction! i need to define a nameserver that manage a domain example.org.au then i need it to have two records. one called server which is the ip address of current machine the other called www where www.example.org.au will be pointed to another ip address. i cant seem to get my system to work. This is my db.example.org.au file example.org.au. IN SOA server.example.org.au. ( 1; 3; 1h; 1w; 1h ) ; ; ;Host addresses localhost.example.org.au IN A 127.0.0.1 www.example.org.au. IN A 192.168.1.200 ; another virtual machine server.example.org.au IN A 192.168.1.199 ; current virtual machine If possible Please correct my errors! thanks! Any good guides out there? Thanks in advance ! :)

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• Remotely port forward/launch process or a client-less remote desktop app?

  - by DC177E

  I have an XP box running Logmein at a remote location behind a linksys router, which was running well for a whole of four days, until we had a power failure. Our ISP gave us a new IP, the machine restarted, and logmein did not autorun (or, at least, it did not automatically sign in), and our service (which may or may not be a Minecraft server with non-backed-up save files) also did not run upon startup. Logmein does not register the new IP (it still displays the old one). I have a DDNS updater service, so I do know the new dynamic address. I have tried using the built in XP remote desktop service, but, as with almost all non-cloud-based remote desktop services, it requires a port forward. Thus, I would appreciate it if anyone has any ideas as to: A: Any way of accessing our router remotely to forward the remote desktop port. I've seen the Remote Management option (forwarding the setup page to port 8080), but I do not have it enabled. I've tried UPnP, but again, the setup page for our router is not forwarded. B: Any way of remotely launching a process that does not require port forwarding (or uses ports 255XX, 18XXX, or 9000.), such as a remote console service built into XP. I realize this is a near impossibility. C: A Way to remotely start logmein, and sign in, which is likely a definite impossibility. Sorry if this is too specific for Stackexchange, or if I've put it into the wrong section (is SuperUser the correct place for this?). Ideas would, again be much appreciated, as shot-in-the-dark-like this may be.

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• securing communication between 2 Linux servers on local network for ports only they need access to

  - by gkdsp

  I have two Linux servers connected to each other via a cross-connect cable, forming a local network. One of the servers presents a DMZ for the other server (e.g. database server) that must be very secure. I'm restricting this question to communication between the two servers for ports that only need to be available to these servers (and no one else). Thus, communication between the two servers can be established by: (1) opening the required port(s) on both servers, and authenticating according to the applications' rules. (2) disabling IP Tables associated with the NIC cards the cross-connect cable is attached to (on both servers). Which method is more secure? In the first case, the needed ports are open to the external world, but protected by user name and password. In the second case, none of the needed ports are open to the outside world, but since the IP Tables are disabled for the NIC cards associated with the cross-connect cables, essentially all of the ports may be considered to be "open" between the two servers (and so if the server creating the DMZ is compromized, the hacker on the DMZ server could view all ports open using the cross-connect cable). Any conventional wisdom how to make the communication secure between two servers for ports only these servers need access to?

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• Email Proxy Ideas

  - by jtnire

  Hi Everyone, I wish to host some managed email servers for some customers. Each customer will have their own email server which will be an all-in-one virtual machine running postfix, dovecot and some webmail suite. Even though each customer will have their own server, I do not wish to give each email server it's own public facing IP. I wish to avail the use of proxy servers so all customers use the same public IP. As for the "smtp-in" from the public internet, this isn't a problem as I can set up many mx servers (using postfix) which will store-and-forward the mail to the correct server (using transport maps). As for the IMAP access from the customer, I was thinking of using perdition which is an IMAP proxy - I believe that this will suit my needs. I am confused however on what to use for the "smtp-out" proxy. The customers will have to authenticate with their receptive email server, however they will have to go via a proxy of some sort as they won't have direct access to their server instance. It probably can't be a store-and-forward proxy either. Does anyone have any idea on what I could use here? Many Thanks

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• Server on blacklist

  - by Cudos

  I have a Debian Wheezy server with several websites with separate domains. Some of these websites uses Wordpress and in turn uses PHP's mail function to send mail. I installed "sendmail" to be able for the server to send mail from PHP. We use Google Apps for our customers, so no need to setup a regular mail server. Now the server is blacklisted at www.spamhaus.org and get this message: This IP address is HELO'ing as "localhost.localdomain" which violates the relevant standards (specifically: RFC5321). I have tried to follow the instructions on these websites with no luck: http://www.cardiothink.com/downloads/README.spamhaus-and-blocked-email.html http://centosbeginer.wordpress.com/2011/07/12/how-to-remove-ip-in-cbl-spamhaus/ Can you please help me figure out how to configure the server? File: /etc/hosts # nameserver config # IPv4 127.0.0.1 somedomain.dk xxx.xxx.xxx.xxx server.somedomain.dk bigby # # IPv6 ::1 ip6-localhost ip6-loopback xxxx::0 ip6-localnet xxxx::0 ip6-mcastprefix xxxx::1 ip6-allnodes xxxx::2 ip6-allrouters xxxx::3 ip6-allhosts xxxx:xxx:xxx:xxxx::2 Debian-76-wheezy-64-minimal File: /etc/hostname bigby somedomain.dk is a made up domain. In reality another domain name I have on this server along with other domains. bigby is also a made up name. It is also something else in reality.

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• Designing a persistent asynchronous TCP protocol

  - by dogglebones

  I have got a collection of web sites that need to send time-sensitive messages to host machines all over my metro area, each on its own generally dynamic IP. Until now, I have been doing this the way of the script kiddie: Each host machine runs an (s)FTP server, or an HTTP(s) server, and correspondingly has a certain port opened up by its gateway. Each host machine runs a program that watches a certain folder and automatically opens or prints or exec()s when a new file of a given extension shows up. Dynamic IP addresses are accommodated using a dynamic DNS service. Each web site does cURL or fsockopen or whatever and communicates directly with its recipient as-needed. This approach has been suprisingly reliable, however obvious issues have come up and the situation needs to be addressed. As stated, these messages are time-sensitive and failures need to be detected within minutes of submission by end-users. What I'm doing is building a messaging protocol. It will run on a machine and connection in my control. As far as the service is concerned, there is no distinction between web site and host machine -- there is only one device sending a message to another device. So that's where I'm at right now. I've got a skeleton server and a skeleton client. They can negotiate high-quality authentication and encryption. The (TCP) connection is persistent and asynchronous, and can handle delimited (i.e., read until \r\n or whatever) as well as length-prefixed (i.e., read exactly n bytes) messages. Unless somebody gives me a better idea, I think I'll handle messages as byte arrays. So I'm looking for suggestions on how to model the protocol itself -- at the application level. I'll mostly be transferring XML and DLM type files, as well as control messages for things like "handshake" and "is so-and-so online?" and so forth. Is there anything really stupid in my train of thought? Or anything I should read about before I get started? Stuff like that -- please and thanks.

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• How to connect android client to the localhost of Apache server (php) inside my laptop?

  - by user1796310

  I'm trying to create android apps which able sending data through wifi connection to my laptop Apache Server and MySQL database. I use the samsung galaxy tab 10.1 as my mobile device. and the protocol i used is HttpGet or HttpPost. And i use XAMPP( with Apache& SQL) to do the server and process the php. But, due to android cannot detect adhoc network from laptop, i use Virtual Router ( for window 7) to create virtual access point and make the tablet able connect to my laptop. But the problem is: [1] in my apps (client-android), where the httpget or httppost to which url? localhost in my laptop- 127.0.0.1 or localhost in android 10.0.0.1? or the ip address of the virtual router? [2]so, if i want access from android to the localhost(laptop-Apache) to call the php to run? which port? which ip address /url that i need to put in android apps(httpget)? and do i need to modify anything in httpconfig for XAMPP? thanks alot.

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• Follow through - How to setup equivalent USVIDEO.ORG DNS-Proxy on Linux

  - by DNSDC

  I'm quite keen to setup similar service (but FREE) and seems you know how to do this. "you need to run your own private dns with artificial records for example pandora.com you also need a real dns to fall back on. now that all requests for these sites are going to your US located box you can open up port 80 on squid and listen for the traffic. your cache_peer settings should allow you to map each domain to their real ip. The trafic now flows initially from your US located box to the service but then the server responds it responds directly to the host. no magic here. I won't share the fine details as it probably best serves all to not over exploit this." Did you mean we need to 1. Setup Forward-only DNS on a US-based server/ip? 2. Setup cache_peer and cache_peer_domain in Squid, I got this. 3. Any iptables rule, prerouting, postrouting rules needed to accomplish this? Appreciate your expert advice. Cheers, Don

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• Identifying test machines in analytics logs

  - by RTigger

  We're just beginning to add analytics to our SaaS application, to begin (among other things) billing clients based on usage. The problem we're running into is there's a few circumstances where our support team will simulate a log in into production to try to reproduce reported issues with a client's configuration. When they log in, an entry will be made into our analytics logs that their specific account has logged in, which we use to calculate billing. A few ideas we had to solve this: 1) We log IP addresses as well as machine keys for each PC that logs in - we could filter out known IP addresses and/or machine keys belonging to support. The drawback is we have to maintain a list of keys / addresses manually. 2) If support (or anyone else internal) runs our application in debug mode (as opposed to release), it will not report analytics. This is fine, as long as support / anyone else remembers to switch to debug mode. 3) Include some sort of reg key / similar setting required to be set when configuring a production system in order to send analytics. Again, fine, as long as our infrastructure team remembers to set the reg key or setting. All of these approaches require some sort of human involvement, which we all know can be iffy at best. Has anyone run into a similar situation? Is there an automated approach to this problem? (PS Of course, we shouldn't be testing in production, but there are a few one-off instances with customer set up that we can't reproduce without logging in as them in production. This is the only time we do so, and this is the case I'm talking about in this question.)

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• Possible Hack with FTP - What are the solutions?

  - by iamrohitbanga

  I was reading the FTP rfc and hence had this idea. Suppose there are several public ftp servers that allow anonymous user login. I open a control connection on port 21 to each of these servers. Now suppose there is a web server a.com with ip address x.y.z.w listening on port 80. FTP allows a user to specify the host on which the data connection is to be setup. So a user specifies the host and port number of a.com web server. Now the ftp server starts sending data to a.com for which it is not a valid HTTP request and hence it is rejected. But a.com notes that the invalid http request came from a public ftp server and not my ip address. Can this not lead to a distributed attack by utilizing all public ftp servers. worse still the the data being sent by ftp server could be a valid http request which could trigger a.com to send a file back to the ftp server. Is there a solution for this or is it no problem at all.

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• Reverse NAT Setup for Hyper-V on Win 2008 R2

  - by sukru

  I'm trying to setup a Linux server behind a Windows Hyper-V host that will help supply some of the services (SSH, HTTPS, etc). However getting RRAS configured for reverse NAT (port forwarding) turned out to be a non trivial task. As a staring point, I tried forwarding port 22 (SSH) to the virtual machine. The virtual machine is on a public interface (i.e.: it also has a visible IP on the same network as the host). On RRAS management console I tried to add a rule, by adding "Local Area Connection" to NAT pool (Public Interface - Enable Nat), and an incoming rule for port 22 - :22. I also tried with the same port enabled on Windows Firewall (and not). The NAT management page tells there are "1 mappings" and "30+ Outbound packets transleted". However all other counters (Inbound packets translated, and respective rejected ones) are always zero. (I'm trying to access the server from an external machine). I can directly access the service if I give the VM's public IP, but not the host's one. Is there a way to enable this on RRAS?

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• Win7 loses connection to network shares after resume unless server specified using FQDN

  - by Szonja Zemkó

  My Win7 client has a connection to a Linux server and its shared folders. The problem occurs when the computer wakes up after a sleep and then one of the shared folders is not accessible. I receive the following message: Error code: 80070035, The network path was not found. I have problem with one specific folder only. When I restart the computer this problematic folder is accessible again. When I log off before sleep the folder is accessible after wakeup. If I try to access the folder by using the FQDN of the server or the server IP it is also accessible. As a temporary solution I mapped the folder to a network drive using the FQDN and it's working fine but it's inconvenient since every other folder is accessible on the server. To summarize: \server\problematicshare no longer works after resume (the Samba server sees my client connect, then disconnects a few seconds later while I receive the above error message) \server\othershare works after resume \fqdn.of.server\problematicshare always works \ip.of.server\problematicshare always works once the problem manifests, I'm no longer able to restart the "Workstation" service (it is not responding) restarting the "Computer Browser" service has no apparent effect the event log doesn't contain anything that seems relevant "ping server" works

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• Directory service unavailiable, new hardware same settings

  - by Alex

  I'm working on a project with 2 sites connected by a VPN. Site 1 has the main server and there is a secondary server at site 2 which I am trying to replace. The current setup works perfectly however I can't for the life of me get the replacement server at site 2 up and running. I'm trying to replace like for like just upgraded hardware. I have installed the OS (all Server 2003 Standard SP2) and used exactly the same settings as the old server. I have setup Active Directory, DNS Server, DHCP Server and WINS Server configured. I have used all the same settings as the old server (except IP address and name). I can access the active directory but I can't do anything; add, edit, delete all returns "the directory service is unavaliable". No-one can login on any of the computers on site 2 and the internet is down. Plugging the old server back in and connecting it to the network rectifies the issue (so both new and old are connected at site 2), everyone can login and the internet is back (curious since the modem connects direct to the switch, and even with the new server online I can connect to the router via IP but not the net). I really don't have much experience but I've been roped into doing this because my company is too cheap to hire a real network admin. Any suggestions of where I can start to troubleshoot this, its driving me crazy and I only have a day before all the users are back on site.

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