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• Exim - Sender verify failed - rejected RCPT

  - by Newtonx

  While checking on Exim's log messages I found many entries of the following message "Sender verify failed" "rejected RCPT" ... I 'm not an exim expert... I'm afraid Exim is not delivering 100% emails to recipients, because our Email Marketing Application its getting a lower OPEN RATE. Can someone helpe understand this log messages? Is it my server saying "No Such User Here" or a remote server? 174.111.111.11 represents my server IP. Thanks Exim log 2010-10-02 14:00:19 SMTP connection from myserverdomain.com.br () [174.111.111.11]:54514 I=[174.111.111.11]:25 closed by QUIT 2010-10-02 14:00:19 SMTP connection from [174.111.111.11]:54515 I=[174.111.111.11]:25 (TCP/IP connection count = 2) 2010-10-02 14:00:19 H=myserverdomain.com.br () [174.111.111.11]:54515 I=[174.111.111.11]:25 Warning: Sender rate 672.4 / 1h 2010-10-02 14:00:19 H=myserverdomain.com.br () [174.111.111.11]:54515 I=[174.111.111.11]:25 sender verify fail for <[email protected]>: No Such User Here 2010-10-02 14:00:19 H=myserverdomain.com.br () [174.111.111.11]:54515 I=[174.111.111.11]:25 F=<[email protected]> rejected RCPT <[email protected]>: Sender verify failed 2010-10-02 14:00:19 SMTP connection from myserverdomain.com.br () [174.111.111.11]:54515 I=[174.111.111.11]:25 closed by QUIT 2010-10-02 14:00:19 SMTP connection from [174.111.111.11]:54516 I=[174.111.111.11]:25 (TCP/IP connection count = 2) 2010-10-02 14:00:19 H=myserverdomain.com.br () [174.111.111.11]:54516 I=[174.111.111.11]:25 Warning: Sender rate 673.3 / 1h 2010-10-02 14:00:19 H=myserverdomain.com.br () [174.111.111.11]:54516 I=[174.111.111.11]:25 sender verify fail for <[email protected]>: No Such User Here 2010-10-02 14:00:19 H=myserverdomain.com.br () [174.111.111.11]:54516 I=[174.111.111.11]:25 F=<[email protected]> rejected RCPT <[email protected]>: Sender verify failed 2010-10-02 14:00:19 SMTP connection from myserverdomain.com.br () [174.111.111.11]:54516 I=[174.111.111.11]:25 closed by QUIT 2010-10-02 14:00:19 SMTP connection from [174.111.111.11]:54517 I=[174.111.111.11]:25 (TCP/IP connection count = 2) 2010-10-02 14:00:19 H=myserverdomain.com.br () [174.111.111.11]:54517 I=[174.111.111.11]:25 Warning: Sender rate 674.3 / 1h 2010-10-02 14:00:20 H=myserverdomain.com.br () [174.111.111.11]:54517 I=[174.111.111.11]:25 sender verify fail for <Luciene_souza_vasconcellos=hotmail.com--2723--bounce@e-mydomain.com.br>: No Such User Here 2010-10-02 14:00:20 H=myserverdomain.com.br () [174.111.111.11]:54517 I=[174.111.111.11]:25 F=<Luciene_souza_vasconcellos=hotmail.com--2723--bounce@e-mydomain.com.br> rejected RCPT <[email protected]>: Sender verify failed

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• TOR hidden service - PHP or CGI - what is safely?

  - by Tai Chi Girl

  I want to setup TOR Onion hidden service with non-static pages. What should I use: Php or CGI? What is more safely? I don't want to reveal IP of machine - I live in China and I afraid goverment. I use linux, thttpd as webserver (thttpd, because someone told me, that Apache generate many IP informations in for example 404 sites).

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• Availability of downloadable DNSBL dumps?

  - by mtah

  I need to cross-reference data involving a large number of IP addresses against known public proxies, spam-listed IPs etc. For obvious performance and network load reasons, obtaining a regularly updated dump for off-line processing would be preferrable. I currently use http://www.dnsbl.manitu.net/download/nixspam-ip.dump.gz - a digest of ix.dnsbl.manitu.net with 40,000 entries updated every 15 minutes. I'd like something more substantial though, so my question is: does such a thing exist?

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• LAN connection problem

  - by Pradi

  how to connect to different system within the lan? im getting messages back when pinged with host ip address and also for default gateway. But messages pinged to another ip address with in my lan are not comming back? please help me out.

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• LAN connection problem

  - by Pradi

  how to connect to different system within the lan? im getting messages back when pinged with host ip address and also for default gateway. But messages pinged to another ip address with in my lan are not comming back? please help me out.

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• Windows 2008 running as KVM guest networking issue

  - by Evolver

  I have a strange networking problem with Windows 2008 server R2, running as guest under KVM-Qemu host. Host is CentOS 6.3 x86_64. It's network settings: # cat /etc/sysconfig/network-scripts/ifcfg-br0 DEVICE=br0 BOOTPROTO=static BROADCAST=xx.xx.xx.63 IPADDR=xx.xx.xx.4 NETMASK=255.255.255.192 NETWORK=xx.xx.xx.0 ONBOOT=yes TYPE=Bridge # cat /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 HWADDR=xx:xx:xx:xx:xx:xx ONBOOT=yes BRIDGE=br0 IPV6INIT=yes IPV6_AUTOCONF=yes # cat /etc/sysconfig/network NETWORKING=yes NETWORKING_IPV6=no HOSTNAME=my.hostname GATEWAY=xx.xx.xx.1 # cat /etc/sysctl net.ipv4.ip_forward = 1 # tried to set it to 0 without any changes net.ipv4.conf.default.rp_filter = 1 # tried to set it to 0 without any changes net.ipv4.conf.default.accept_source_route = 0 # tried to set it to 1 without any changes kernel.sysrq = 0 kernel.core_uses_pid = 1 net.ipv4.tcp_syncookies = 1 net.bridge.bridge-nf-call-ip6tables = 0 net.bridge.bridge-nf-call-iptables = 0 net.bridge.bridge-nf-call-arptables = 0 kernel.msgmnb = 65536 kernel.msgmax = 65536 kernel.shmmax = 68719476736 kernel.shmall = 4294967296 # route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface xx.xx.xx.0 0.0.0.0 255.255.255.192 U 0 0 0 br0 169.254.0.0 0.0.0.0 255.255.0.0 U 1004 0 0 br0 0.0.0.0 xx.xx.xx.1 0.0.0.0 UG 0 0 0 br0 Node IP is xx.xx.xx.4, guest IP is xx.xx.xx.24, both host and guest is in the same network (/26). There are several linux guest running fine on the node (centos, debian, ubuntu, arch), and even Windows 2003 x86 also running fine. But Win2008 does not. I wonder, what's the difference. From Win2008 guest I can ping nothing: neither gateway, nor any other IP, even they are in the same subnet. From outside I also cannot ping guest. Almost. If I ping it from another server in same subnet, it's barely pinging, losing more than 90% packets. Firewall on the guest is completely off. Tried to set up network manually as well as via DHCP without success (BTW, DHCP set up network settings correctly). I suspect that is a kind of routing problem, but I spent whole day and still cannot figure it out. I would be appreciate for any help.

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• how can I reconnect DSL in cisco router 877w

  - by Sulaiman

  Hi All, I've configured ADSL and added a new public LAN ips for the router. How can I reconnect DSL connection and apply the new configuration without executing the command reload this is the commands I am using for DSL configuration config terminal interface dialer 0 ppp chap hostname User ppp chap password 0 Pass exit exit wr mem and this is the commands I am using for adding IP addresses: configure t interface vlan 1 ip address xx.xx.xx.xx 255.255.255.252 Secondary exit wr mem thank you

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• Running SUN UDS 5213 on Windows 7

  - by Lebo

  I am getting this error when I try to install Sun ONE UDS 5213 on Windows 7: This Windows NT system does not have TCP/IP installed. Please install the TCP/IP package before installing Sun ONE UDS Please help.

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• *Simple* way to block DDoS by number of requests

  - by Eduard Luca

  I have 3 Varnish 3.0.2 servers with Apache 2 as backends, which are being load balanced through a HAproxy separate server. I need to find a very simple program (I'm not much of a sysadmin), which blocks requests from an IP, if that IP has made more than X requests in Y seconds. Would something like this be achievable with a simple solution? Right now I have to block all requests manually with iptables.

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• route view for new IPs?

  - by Clear.Cache

  The route view method is not working for me telnet route-views.routeviews.org (logged in with user "rviews") route-viewsshow ip bgp 173.244.44.0 | inc 10464 route-viewsshow ip bgp 173.244.44.0 % Network not in table route-views Am I doing something wrong?

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• How to know which program is using the WebClient service?

  - by sork

  Hello, I just found out by using TCPView that one of my svchost.exe had an http connection in "CLOSE_WAIT" to a strange ip address, although no other visible program was running. With the help of Process Explorer I discovered that this svchost was using the WebClient windows service. I'm wondering how I can figure out what program used WebClient to connect to this ip, in order to determine if it's malware.

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• Remove key from known_hosts

  - by Adam Matan

  Hi, I have built several virtual machines during the last few weeks. The problem is, the .ssh/known_hosts gives me the Man in the middle warning. This happens because another fingerprint is associated with the virtual machine IP. In the .ssh/known_hosts file, however, I don't seem to find the record related to the IP, only two bizarre, key-like strings and "ssh-rsa". Any ideas how to remove the old key from known_hosts? Thanks, Udi

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• Windows Server 2008 R2 network adapter stops working, requires hard reboot

  - by Geoff Dalgas

  TL;DR version: Turns out this was a Windows Server 2008 R2 kernel networking bug. After siccing Microsoft support on it, we (eventually) got an unpublished kernel hotfix from Microsoft to address it. If you, too, are experiencing mysterious low-level network driver failures requiring a reboot/bluescreen cycle, you might want that hotfix (or maybe Service Pack 1 whenever it is released, too.) We have been using HAProxy along with heartbeat from the Linux-HA project. We are using two linux instances to provide a failover. Each server has with their own public IP and a single IP which is shared between the two using a virtual interface (eth1:1) at IP: 69.59.196.211 The virtual interface (eth1:1) IP 69.59.196.211 is configured as the gateway for the windows servers behind them and we use ip_forwarding to route traffic. We are experiencing an occasional network outage on one of our windows servers behind our linux gateways. HAProxy will detect the server is offline which we can verify by remoting to the failed server and attempting to ping the gateway: Pinging 69.59.196.211 with 32 bytes of data: Reply from 69.59.196.220: Destination host unreachable. Running arp -a on this failed server shows that there is no entry for the gateway address (69.59.196.211): Interface: 69.59.196.220 --- 0xa Internet Address Physical Address Type 69.59.196.161 00-26-88-63-c7-80 dynamic 69.59.196.210 00-15-5d-0a-3e-0e dynamic 69.59.196.212 00-21-5e-4d-45-c9 dynamic 69.59.196.213 00-15-5d-00-b2-0d dynamic 69.59.196.215 00-21-5e-4d-61-1a dynamic 69.59.196.217 00-21-5e-4d-2c-e8 dynamic 69.59.196.219 00-21-5e-4d-38-e5 dynamic 69.59.196.221 00-15-5d-00-b2-0d dynamic 69.59.196.222 00-15-5d-0a-3e-09 dynamic 69.59.196.223 ff-ff-ff-ff-ff-ff static 224.0.0.22 01-00-5e-00-00-16 static 224.0.0.252 01-00-5e-00-00-fc static 225.0.0.1 01-00-5e-00-00-01 static On our linux gateway instances arp -a shows: peak-colo-196-220.peak.org (69.59.196.220) at <incomplete> on eth1 stackoverflow.com (69.59.196.212) at 00:21:5e:4d:45:c9 [ether] on eth1 peak-colo-196-215.peak.org (69.59.196.215) at 00:21:5e:4d:61:1a [ether] on eth1 peak-colo-196-219.peak.org (69.59.196.219) at 00:21:5e:4d:38:e5 [ether] on eth1 peak-colo-196-222.peak.org (69.59.196.222) at 00:15:5d:0a:3e:09 [ether] on eth1 peak-colo-196-209.peak.org (69.59.196.209) at 00:26:88:63:c7:80 [ether] on eth1 peak-colo-196-217.peak.org (69.59.196.217) at 00:21:5e:4d:2c:e8 [ether] on eth1 Why would arp occasionally set the entry for this failed server as <incomplete>? Should we be defining our arp entries statically? I've always left arp alone since it works 99% of the time, but in this one instance it appears to be failing. Are there any additional troubleshooting steps we can take help resolve this issue? THINGS WE HAVE TRIED I added a static arp entry for testing on one of the linux gateways which still didn't help. root@haproxy2:~# arp -a peak-colo-196-215.peak.org (69.59.196.215) at 00:21:5e:4d:61:1a [ether] on eth1 peak-colo-196-221.peak.org (69.59.196.221) at 00:15:5d:00:b2:0d [ether] on eth1 stackoverflow.com (69.59.196.212) at 00:21:5e:4d:45:c9 [ether] on eth1 peak-colo-196-219.peak.org (69.59.196.219) at 00:21:5e:4d:38:e5 [ether] on eth1 peak-colo-196-209.peak.org (69.59.196.209) at 00:26:88:63:c7:80 [ether] on eth1 peak-colo-196-217.peak.org (69.59.196.217) at 00:21:5e:4d:2c:e8 [ether] on eth1 peak-colo-196-220.peak.org (69.59.196.220) at 00:21:5e:4d:30:8d [ether] PERM on eth1 root@haproxy2:~# arp -i eth1 -s 69.59.196.220 00:21:5e:4d:30:8d root@haproxy2:~# ping 69.59.196.220 PING 69.59.196.220 (69.59.196.220) 56(84) bytes of data. --- 69.59.196.220 ping statistics --- 7 packets transmitted, 0 received, 100% packet loss, time 6006ms Rebooting the windows web server solves this issue temporarily with no other changes to the network but our experience shows this issue will come back. Swapping network cards and switches I noticed the link light on the port of the switch for the failed windows server was running at 100Mb instead of 1Gb on the failed interface. I moved the cable to several other open ports and the link indicated 100Mb for each port that I tried. I also swapped the cable with the same result. I tried changing the properties of the network card in windows and the server locked up and required a hard reset after clicking apply. This windows server has two physical network interfaces so I have swapped the cables and network settings on the two interfaces to see if the problem follows the interface. If the public interface goes down again we will know that it is not an issue with the network card. (We also tried another switch we have on hand, no change) Changing network hardware driver versions We've had the same problem with the latest Broadcom driver, as well as the built-in driver that ships in Windows Server 2008 R2. Replacing network cables As a last ditch effort we remembered another change that occurred was the replacement of all of the patch cords between our servers / switch. We had purchased two sets, one green of lengths 1ft - 3ft for the private interfaces and another set of red cables for the public interfaces. We swapped out all of the public interface patch cables with a different brand and ran our servers without issue for a full week ... aaaaaand then the problem recurred. Disable checksum offload, remove TProxy We also tried disabling TCP/IP checksum offload in the driver, no change. We're now pulling out TProxy and moving to a more traditional x-forwarded-for network arrangement without any fancy IP address rewriting. We'll see if that helps. Switch Virtualization providers On the off chance this was related to Hyper-V in some way (we do host Linux VMs on it), we switched to VMWare Server. No change. Switch host model We've reached the end of our troubleshooting rope and are now formally involving Microsoft support. They recommended changing the host model: http://en.wikipedia.org/wiki/Host_model http://technet.microsoft.com/en-us/magazine/2007.09.cableguy.aspx We did that, and.. we'll see.

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• Appropriate to Stateless Autoconfigure a Server?

  - by user31498

  I am setting up a network to support IPv6. Stateless Autoconfiguration seems to be the preferred way to get an IP address on an IPv6 network but is this the preferred way for a server? Other machines outside of the network are going to need to be able to talk to the server. Is it preferable to give the server a static IP address or is there something fancy that can be done with DNS to keep track of the server address?

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• Can't connect to EC2 instance in VPC (Amazon AWS)

  - by Ryan Lynch

  I've taken the following steps: Created a VPC (with a single public subnet) Added an EC2 instance to the VPC Allocated an elastic IP Associated the elastic IP with the instance Created a security group and assigned it to the instance Modified the security rules to allow inbound ICMP echo and TCP on port 22 I've done all this and I still can't ping or ssh into the instance. If I follow the same steps minus the VPC bits I am able to set this up without issue. What step am I missing?

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• dlink arp spoofing prevention

  - by Wiploo

  someone can help me understanding arp spoofing prevention on dlink dgs-3100 (ftp://ftp2.dlink.com/PRODUCTS/DGS-3100-48P/REVA/DGS-3100-48P_MANUAL_3.60_EN.PDF). I'd like to protect my gateway MAC/IP from spoofing so I'have tryed to add a rule "IP: 192.168.1.1 MAC: aa-aa-aa-aa-aa-aa" flagging all the port of the switch as untrusted. When I apply the rule I lose connection to all pc attached to the switch. I certanly made some errors, but I can't understand what is wrong. Best Regards

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• Making to the DNS on two different VPNs play nice.

  - by NitroxDM

  Setup: I have two separate networks I need to connect to at the same time. VPN 1 PPTP IP : 192.168.2.0/24 DNS : 192.168.2.32; 192.168.2.34 (Windows 2003) Domain : old.com Forwarder : 192.168.2.1 (Gateway running DNS) DD-WRT VPN 2 OpenVPN using Routing -- I'm going to switch to bridging IP : 192.168.10.0/24 DNS : 192.168.10.10 (Windows 2008) Domain : xyz.dc Forwarder : 192.168.10.1 (Gateway running DNS) ClearOS When I'm connected I would like to resolve host names on both networks without fully qualifying them.

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• Change interface for doing a whois

  - by Wizzard

  We got 4 ips on our server, and I noticed that one of our IP's appears to be blocked by a big whois providor. Is there a way I can route whois lookups over a different IP - not just eth0?

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• Blocking HTTP clients which request certain URLs repeatedly

  - by Guido Domenici

  I run a website on Windows Server 2008 R2. Looking through the IIS logs, I have noticed that there are some IP addresses repeatedly requesting certain URLs (such as for example /mysql/phpmyadmin/main.php, /phpadmin/main.php) which do not exist, as the site is entirely served off of ASP.NET. They are obviously fishing for known vulnerabilities. My question is, are there any firewall or other tools (Windows built-in or commercial) that allow me to block those IP addresses which request certain URLs multiple times?

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• Can't get DHCPd to assign IPs to unknown clients

  - by Jakobud

  I'm using Webmin to admin our DHCPd server. But I'm having a hard time getting it to assign IP addresses to unknown clients. The only way I can get it to assign an IP is to make sure a host is added to DHCPd as a host so that it gets a static-lease IP assigned to it. I thought "Allow Unknown Clients" was the key, but it still isn't assigning IPs to unknown clients. I have a pool setup so that the unknown clients should get an IP between 10.20.0.200 - 10.20.0.249. Here is the config file. What am I missing here? allow unknown-clients; # Primary DHCP server config authoritative; ddns-update-style none; failover peer "dhcp-failover" { primary; address 10.20.0.30; port 647; peer address 10.20.0.25; peer port 647; max-response-delay 60; max-unacked-updates 10; load balance max seconds 3; mclt 3600; split 128; } subnet 10.20.0.0 netmask 255.255.255.0 { allow unknown-clients; option subnet-mask 255.255.255.0; option broadcast-address 10.20.0.255; option routers 10.20.0.100; option domain-name "ourdomain.com"; option domain-name-servers 192.168.10.20; default-lease-time 86400; max-lease-time 86400; option ntp-servers 192.168.10.20; option time-offset -25200; pool { allow unknown-clients; failover peer "dhcp-failover"; max-lease-time 86400; range 10.20.0.200 10.20.0.249; deny dynamic bootp clients; } host Server-myserver { option host-name "whatever.ourdomain.com"; hardware ethernet 00:89:D4:35:4F:13; fixed-address 10.20.0.23; } }

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• Do proxies really provide anonymity?

  - by Somebody still uses you MS-DOS

  Do web proxies really provide anonymity? I mean, without someone asking for logs in a web proxy server for who/when connected, is it impossible to know who was behind that IP address? I'm asking this because I heard somewhere that some technologies (like "flash") bypass personal IP information for requests or something like that. (I'm a noob in server configuration and concepts like DNS and proxies. Thanks!)

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• Why would an iPod Touch and PS3 respond to netdiscover as 0.0.0.0?

  - by Iszi

  Only slightly related to this question, because it was discovered in the same scan: Can someone explain how this happened? When running netdiscover on my home network, my iPod Touch (identified by DHCP-reserved IP address and MAC address) responded to both its own IP address on our 10.x.x.x subnet and to 0.0.0.0 also. Why would this have happened? EDIT: After letting netdiscover run awhile longer, it seems one of the PS3s on the network is also answering to 0.0.0.0 - why is this?

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• Voice on 4G Technologies such as LTE and WiMAX?

  - by Vaibhav Bajpai

  I understand that LTE and WiMAX are IP-based technologies that do NOT have a voice component unlike the current 3G technologies. So is it like, voice calls in 4G would be completely driven on top of IP? Wouldn't this break backward compatibility with existing 3G technologies? Is this why 4G is taking it took long to take ubiquitous availability?

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• Port forwarding using a BT Home Hub 2.0 (Supplied to new BT Infinity Customers in the UK)

  - by Jasarien

  I don't usually have trouble with port forwarding, I've been able to do it successfully on a number of different routers, including Linksys, Belkin, Netgear and Apple (Time Capsule / Airport Extreme). So I'm quite confused here. I had been using my Apple Time Capsule as my router for a few years now, with several port mappings all working fine. But it died recently, so I've had to resort to using the BT Home Hub 2.0 that was supplied with my BT Infinity broadband subscription. The forwarding interface for the Home Hub is simplified for the most part, allowing you to select an application or game and assign it to a particular computer on the network which you choose from a list that the Home Hub has 'discovered'. My Mac Pro has a manually assigned static IP 192.168.1.4 and my router is static at 192.168.1. I have chosen SSH from the list of applications and assigned it to my Mac Pro (the only computer in the list currently). The Home Hub also has a feature to keep a DNS service updated, and I have set it to keep my external IP address updated on my hostname. This is how I had it setup in the past with other routers and not had trouble before. I am able to ping my hostname (and external IP) from outside the network and get a response. But when I try to connect using SSH, the connection times out. The Home Hub also has "Firewall settings". The currently selected setting is: Default: Allow all outgoing connections and block all incoming traffic. Games and application sharing is allowed. But I've tried changing it to: Disabled: All traffic is allowed to pass through your BT Home Hub to your devices. Note: you’ll still need to use the games and application sharing feature to make sure that certain applications work properly. And the connection still times out... So frustrating. The OS X firewall on my Mac is disabled, so I don't think that's in the way. I have tried setting the port forwarding manually, instead of relying on the preset "SSH" option (incase it's not using the port I expect). So I set up my own "application" (as the Home Hub calls it) and forwarded external port 22 TCP to internal port 22 TCP to 192.168.1.4 - but that just gives the same result - unable to connect. Next, with the router's firewall disabled and OS X's firewall disabled, I ran the Shields Up test (https://www.grc.com/x/ne.dll?bh0bkyd2) and the result was that all my service ports (0 - 1055) are in 'Stealth' mode. I.e. nothing even exists at my IP as far as any outsider is concerned... Strange. The only thing that seems to work is setting my Mac Pro as the DMZ - which I don't want to do for obvious reasons. Any help with this would be extremely appreciated, thanks.

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• What Iptables rules need I to forward a windows remote desktop connection?

  - by avastreg

  I have this situation: network mask. 255.255.255.0 router/gateway: Ubuntu server (only command line, no gui) with internal lan ip 192.168.0.2 and a dynamic dns on the external ip Windows pc on 192.168.0.1 with RDP (remote desktop connection) enabled on 3389 I want to forward the RDP service on the external address: how can i do that? What are the iptables rules I need to connect to my Windows pc from the outside world?

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