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• SMTP port open - but not open

  - by Frederik Nielsen

  As some of you might know, I am setting up an exchange server. Now I ran into another problem: I cannot connect to the SMTP service from outside the server! The ports are opened in the gateway device (a ZyXEL USG50), Windows firewall is off. I see the packets travekl through the ZyXEL firewall, and I can also see the packets with wireshark on the server, so I know they are getting all the way in to the server. I also know it receives them, and sends out the reply - and this is where things go bad! Analyzing with wireshark, I get these errors in the return packets: Header checksum: 0x0000 [incorrect, should be 0x0779 (may be caused by "IP checksum offload"?)] And: Acknowledgment Number: 0x8e3337d1 [should be 0x00000000 because ACK flag is not set] What the (sorry my French) hell is going on? I really cant figure it out.. Thanks in advance.

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• Can't connect to sql server 2008 named instance

  - by hcsrpm

  I have sql server 2005 and 2008 running on a server on my local (and very straightforward) network. Using sql management studio 2008 and visual studio 2008, I can connect over the network to the 2005 instance which is the default instance. I can't connect to the 08 instance (named MC08). I can connect to both when logged in to the server. Remote connections have been enabled for MC08 and dynamic ports is turned off (assigned to port 1045). The sql browser service is running as well. This used to work so I'm not sure what has changed. I can't connect using the IP address either. Nothing unusual in the event log either. Any ideas?

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• Can't mount time capsule via wi-fi.

  - by Grnmntn

  I have an Apple time capsule, and have been able to back up to it without a problem for the past few months. However, today I found I cannot connect to the time capsule from Finder, though it appears there, when I click "connect as...", it takes a few seconds and then reports connect failed, "the server may not exist or it is not operational at this time. Check the server name or IP address and your network connection and try again". When I check Time Machine, it says the last backup failed because "the backup volume could not be mounted". The strange part is, the time capsule is also my router, and I am able to use the time capsule as a wireless access point without a problem. Any ideas?

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• Set up Glassfish connection pool to talk to a database on a Ubuntu VPS

  - by Harry Pham

  On my Ubuntu VPS, i have a mysql server running and a Glassfish 3.0.1 Application Server running. And I am having a hard to have my GF successfully ping the database. Here is my GF set up Assume: x.y.z.t is the ip of my VPS Resource Type: javax.sql.ConnectionPoolDataSource User: root DatabaseName: scholar Url: jdbc:mysql://x.y.z.t:3306/scholar URL: jdbc:mysql://x.y.z.t:3306/scholar Password: xxxx PortNumber: 3306 ServerName: x.y.z.t Inside my glassfish3/glassfish/lib, I have my mysql-connector-java-5.1.13-bin.jar Inside the database, table mysql here is the result of the query select User, Host from user; +------------------+-----------+ | User | Host | +------------------+-----------+ | root | 127.0.0.1 | | debian-sys-maint | localhost | | root | localhost | | root | yunaeyes | +------------------+-----------+ Now from my machine, if I try to connect to this db via mysql browser (mysql client software), well I cant. Well from the table above, seem like it only allow localhost to connect to this db. Keep in mind that both my db and my GF are on the same VPS. Please help

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• UNIX-Security Advise

  - by Phoibe

  Hello, I want to build a quite secure UNIX-Server. Mechanisms I already implemented: SNORT + fwsnort for banning psad to block network-scanning attempts Portknocking to start+open SSH (key-based login - no password) hourly update of IP-Tables-Rules from a Security-Subscription Fail2Ban ClamAV & Rootkithunter + Logwatch What service-independent security mechanism would you add to this? What mechanism are you using? The server will run Apache&Postfix. For Apache hiding the server-information ofc. and nothing I can think of for Postfix. Thanks

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• Virus sending phishing emails through exchange server

  - by therulebookman

  It appears that there is a virus on my network somewhere that is sending phishing emails through my exchange server. I can see the messages in message tracking and I see many SMTP errors for NDR's and rejected connections from external servers, but I do not see any SMTP authentications and I have logging up to MAX. How can I find the IP or hostname of the PC that is infected? Or is there some other explanation than virus? Anti-virus scan on server is clean. Server is not an open relay. Thanks

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• Xen and HyperVM build question on os template

  - by Levi De Haan

  I recently built a server with hypervm and xen, now i know xen from command line, but hypervm ties into our whmcs and so its a requirement, however my question is this, when i build a new o/s template my partition table is gone, and i know why, but i was wondering if anyone has built anything in hypervm for adding in partition tables, so i dont have to reinvent the wheel :). i can do it command line in the created vm with fdisk, and i have tracked down the creation scripts for hypervm but i am unsure if these insert directly into the machine as it looks like a lot of the things it does are externalized and are for xen to assign things like ip address etc.. oh and on an aside when i go in to modify the .cnf file to change the boot disk from cdrom to drive on windows when i boot using hypervm it overwrites my setting again..frustrating as heck, i've been trying to track down where in the code it does this, has anyone else had this problem and if so how did you fix it if you did?

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• Xen and HyperVM build question on os template

  - by Levi De Haan

  I recently built a server with hypervm and xen, now i know xen from command line, but hypervm ties into our whmcs and so its a requirement, however my question is this, when i build a new o/s template my partition table is gone, and i know why, but i was wondering if anyone has built anything in hypervm for adding in partition tables, so i dont have to reinvent the wheel :). i can do it command line in the created vm with fdisk, and i have tracked down the creation scripts for hypervm but i am unsure if these insert directly into the machine as it looks like a lot of the things it does are externalized and are for xen to assign things like ip address etc.. oh and on an aside when i go in to modify the .cnf file to change the boot disk from cdrom to drive on windows when i boot using hypervm it overwrites my setting again..frustrating as heck, i've been trying to track down where in the code it does this, has anyone else had this problem and if so how did you fix it if you did?

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• Oracle 11g network configuration

  - by Kylo

  I installed Oracle 11g Enterprise Edition on my Windows 7 Pro. My problem is that I cannot log into database from other host (local network). When I connect to database using Oracle SQLdeveloper everything is ok as long as I specify 'localhost' in connection configuration. However, when I change it to '192.168.0.190' which is my host IP address I get 'The Network Adapter could not establish the connection'. I get the same error when logging in from other host in local network. What is the problem?

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• New LAMP server, all links redirecting to localhost

  - by serilain

  I've got a very frustrating issue with what should be a bespoke install of Ubuntu 12.04, the LAMP config provided in apt-get install lamp-server^, and a web application called The Fascinator. After installing those three things and making no changes to any of them, I can access the application through a public IP (http://lib-hf1.lib.sfu.ca:9997 for the curious), but the domain of every link within that page is changed to localhost, including links to images and CSS, so nothing loads correctly and all of the links are broken. I've Googled around and found some people who appear to be having this issue with WP and Drupal, but nothing makes reference to a system-wide setting, and no one using the Fascinator seems to be having this issue. I have a faint memory that this might have something to do with mod_rewrite, but I'm pretty well stumped.

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• wireless access point

  - by Warren Bullock III

  I'm hoping to get some suggestions for possible Wireless Access point/router models which will allow us to have two separate networks. We run an internal network on 10.x.x.x IP range where we have shares and other network resources for which we would like to have our regular users access. However, we would also like to offer a separate wireless network for guests which ideally would be on 192.168.x.x and these users would not be able to see any of the resources sitting on the 10.x.x.x network. Anyone have any recommendations on single devices that might be able to get the job done? I was looking at the Linksys E4200 and it seems to support what I'm looking to do... any others? Thanks in advance for any suggestions.

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• Sendmail : forwarding emails problem

  - by Chayan

  So here is my situation. I have this 2 DNS (say a.org and b.org) with the same IP address (both A record) tied to this box. We have Google mail handing our a.org emails . I want b.org emails to forward to users at a.org emails . My sendmail is getting confused and is delivering all b.org emails locally instead of forwarding them to a.org (which is specified in the .forward) . What do I do from the sendmail side to force external delivery . Thanks Much

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• SQL Server 2008 is not accessible from Windows Server 2008 ?

  - by Albert Widjaja

  Hi, I have successfully configured Windows Server 2008 Enterprise SP2 with SQL Server 2008 Enterprise SP2 all 64 bit, however when I tried to access this particular SQL Server 2008 DB instance from another SQL Server 2008 SSMS in another Windows Server 2008 it failed ? what I did is to disabled the IPv6 IP address using the regedit but still the problem hasn't been fixed even after restart ? I have enabled the named piped as well but still no luck ? any help please ? Here's the error message: " A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) (Microsoft SQL Server, Error: -1) "

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• Windows 7 / Windows Vista won't connect to 802.1x RADIUS Server

  - by Calvin Froedge

  I've deployed Radius and have no problems connecting with TTLS, PEAP, or MD5 using linux, mac, and windows xp. For Windows 7 and Vista, I'm never prompted with the dialog box to enter username & password after configuring 802.1x support on the client. Steps taken: Enabled Wired Autoconfig in services.msc Set to use PEAP Set to require user authentication When I enable the network connection it says "Trying to authenticate" then fails with no error log / message given. The radius server gives no indication that there was ever a request (no Access-Reject - the client simply never tries to authenticate). On the windows 7 client, I can see that the DHCP server does not assign an IP to the client when 802.1x is enabled on the client (though it does when it isn't). How can I debug this further? Has anyone else run into a similar situation? My radius server is freeradius on Ubuntu 11.10.

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• "Account locked out" security event at midnight

  - by Kev

  The last three midnights I've gotten an Event ID 539 in the log...about my own account: Event Type: Failure Audit Event Source: Security Event Category: Logon/Logoff Event ID: 539 Date: 2010-04-26 Time: 12:00:20 AM User: NT AUTHORITY\SYSTEM Computer: SERVERNAME Description: Logon Failure: Reason: Account locked out User Name: MyUser Domain: MYDOMAIN Logon Type: 3 Logon Process: NtLmSsp Authentication Package: NTLM Workstation Name: SERVERNAME Caller User Name: - Caller Domain: - Caller Logon ID: - Caller Process ID: - Transited Services: - Source Network Address: - Source Port: - It's always within a half minute of midnight. There are no login attempts before it. Right after it (in the same second) there's a success audit entry: Logon attempt using explicit credentials: Logged on user: User Name: SERVERNAME$ Domain: MYDOMAIN Logon ID: (0x0,0x3E7) Logon GUID: - User whose credentials were used: Target User Name: MyUser Target Domain: MYDOMAIN Target Logon GUID: - Target Server Name: servername.mydomain.lan Target Server Info: servername.mydomain.lan Caller Process ID: 2724 Source Network Address: - Source Port: - The process ID was the same on all three of them, so I looked it up, and right now at least it maps to TCP/IP Services (Microsoft). I don't believe I changed any policies or anything on Friday. How should I interpret this?

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• How to run bash script from windows using plink on linux

  - by user128877

  I'm trying to run a simple bat file from windows that will run a bash script on linux machine. The bash script is located on the linux machine. For example: I'm trying to run this bat file from windows plink.exe -pw <password> root@<ip> bash -c "/root/script.sh" Result: When running from windows the cmd is stuck forever when running the specific script (/root/script.sh) from the linux machine it's working just fine. The script contain ruby code and I'm using RVM

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• Setting up Windows 2008 with VPN and NAT

  - by Benson

  I have a Windows 2008 box set up with VPN, and that works quite well. NPS is used to validate the VPN clients, who are able to access the private address of the server, once connected. I can't for the life of me get NAT working for the VPN clients, though. I've added NAT as a routing protocol, and set the one on in the VPN address pool as private, and the other as public - but it still won't NAT connections when I add a route through the VPN server's IP on the client side (route add SomeInternetIp IpOfPrivateInterfaceOnServer). I know I can reach the server's private interface (which happens to be 10.2.2.1) with remote desktop client, so I can't think of any issues with the VPN.

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• DHCP: server behavior in a two server situation

  - by lang2

  This is a question w.r.t server behavior in the DHCP standard. I've read the RFC and it's still not clear to me. Situation is this: There are two DHCP servers on a network. My client initially get IP address from server A. At some stage, server A goes down. My poor client is sending REQUEST in RENEW and then REBIND state, with no response whatsoever. My questions is: in this situation, should server B response to the REQUEST in REBIND state, e.g. DHCPNAK? Thanks, lang2

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• Apache proxy is modifying the HTTP status code

  - by jarnbjo

  I am using Apache as a proxy frontend for a Java web application, which is deployed on WebSphere. The web application is using custom status codes (55x) to signal specific errors to the clients. When accessing the web application directly through the WebSphere HTTP listener, everything works as expected, but when these requests are proxied through an Apache load balancer, the status codes are modified by Apache and replaced with a generic 500 error code (internal server error). In Apache's access.log, the correct status code is logged: <IP> - - [11/Nov/2011:17:24:53 +0100] "POST <URL> HTTP/1.1" 551 36 But the actual response received by the client starts like this (logged with tcpdump): HTTP/1.1 500 Internal Server Error ... Followed by the real status code in the response content: ... Error 551: Berichteter Fehler: 551 ... Is there an obvious reason for this behaviour or does someone have a suggestion on how to modify the Apache configuration to forward the "real" status code instead of 500?

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• Ubuntu, apache2 wildcard dns to subdomain

  - by Mark van Velthoven

  Currently I'm hosting my own (ubuntu) server with the following services: samba, ftp and a webserver. I've bought a domain and linked the DNS A-record to my ISP's IP. This is working correctly. Now I'd like to use the DNS wildcard-record to create subdomains. I want to avoid waiting 24hrs before the DNS change completes. Thusfar I'm only able to redirect all incoming wildcards to the same directory: test1.domain.com redirects to /var/www test2.domain.com redirects to /var/www Although I'd like to get: test1.domain.com redirects to /var/www/test1 test2.domain.com redirects to /var/www/test2 My guess would be to change the file /etc/apache2/sites-available/domain. Any help or tips would be welcome! Thanks, Mark

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• Zyxel p-2602HW-1DA - LAN to WAN routing problems

  - by Garrett

  Hi Got a new router yesterday (due to new internet supplier) and now all my requests for my own server (local lan) is routed directly to the router instead of the server, when using dns. Ex. I have a website www.mysite.org running on my server at home (local lan). From work I can access it via www.mysite.org, which is great. But from home (local lan) my request's for www.mysite.org gets rerouted to the routers web admin interface My last router didn't do this. My new router is a Zyxel P-2602HW-1DA, my old one was a LinkSys WRT-54GC V. 2.0. There's a rather wierd WAN-LAN, WAN-WAN setup interface which I cant really comprehend yet and the docs are rather vague. Have anyone had the same problem and can anyone guide me to a solution, would nice not write the ip address everytime i need to access the server on local lan. :). Kind regards Garrett

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• Permanent Routes Centos Questions

  - by user65053

  So with a little help I figured out how to setup these routes and I can set them in rc.local route add -net 208.82.236.0 netmask 255.255.255.0 dev ppp0 metric 1 route add -net 208.82.236.0 netmask 255.255.255.0 dev eth0 metric 10 my question is being that the first route is ppp0 as soon as I disconnect the modem the route is dropped how do I maintain the route or make it permanent so that next time the modem connects it will follow the route. Currently after ppp0 disconnects the route is dropped netstat -r Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface laxapx03.o1.com * 255.255.255.255 UH 0 0 0 ppp0 208.82.236.0 * 255.255.255.0 U 0 0 0 eth0 10.0.1.0 * 255.255.255.0 U 0 0 0 eth0 169.254.0.0 * 255.255.0.0 U 0 0 0 eth0 default 10.0.1.1 0.0.0.0 UG 0 0 0 eth0

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• ruby: invalid opcode

  - by adamo

  There's a fairly complex application than runs on two VMs (on Xen). Both VMs run CentOS 6.2 with the exact same packages and configuration for every application running (minus networking which is different). SELinux is disabled on both. On machine A the application builds perfectly. On machine B when running some tests we get: ruby[2010] trap invalid opcode ip:7ff9d2944c30 sp:7fff9797e0f8 error:0 in ld-2.12.so[7ff9d2930000+20000] Digging a bit more to find out where the machines differ, machine A has: model name : Six-Core AMD Opteron(tm) Processor 2423 HE and machine B: model name : AMD Opteron(TM) Processor 6272 I've tried booting machine B with cpuid_mask_cpu=fam_10_rev_c in grub but it did not help either. So any advice as to how to deal with this, or how to approach the hosting provider so as to run this VM on another physical machine will be greatly appreciated.

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• Apache2: Trying to map a subdomain to a subdirectory

  - by user1561753

  So basically I want to have: sub.domain.com/anything - domain.com/asub/anything I'm a bit new to this and a bit confused. The first thing I did was configure my DNS settings so sub.domain.com goes to domain.com using a CNAME (would an A record and the IP be better?) Next I went into my VirtualHost file and have: RewriteEngine on RewriteCond %{HTTP_HOST} www.(.+) [NC] RewriteRule ^/(.*) http://domain.com/$1 [R] RewriteCond %{HTTP_HOST} ^sub.domain.com RewriteRule ^/(.*) http://domain.com/asub/$1 [R] So the first rule is meant to handle www. and making sure that is caught correctly and it works. The second rule is what I've added for the subdomain mapping and it doesn't seem to be doing anything

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• Configuring Apache reverse proxy

  - by Martin

  I have loadbalancer server and edges. I am trying to configure reverse proxy in order to hide the backend servers PL1,2,3. PL 1,2,3 are not located in same subnet. They are located in different locations. PL1 Lb1 -> PL2 PL3 I tried to configure Apache reverse proxy but it is not sending request to PL1,2,3. Reverse proxy worked only when I configured apache to send request to local server on other port. ProxyRequests Off <Proxy *> Order deny,allow Allow from all </Proxy> ProxyPass /PL1 http://PL1server.com/ ProxyPassReverse /PL1 http://PL1server.com/ The above configuration did not worked. Could you help me to solve the issue. Or is there other proxy types like Squid,Socks5 to solve this issue. Does the reverse proxy fails if we use IP address or domain URL in ProxyPass and ProxyPassReverse ?

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