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• How to get access to console to reset Cisco 3750?

  - by genehack

  I acquired two Cisco 3750 switches from another part of my organization. I was able to complete the standard password/config reset procedure on one without any issues -- boot it, put it into express config mode, telnet in, reset the passwords, etc. The second one doesn't ever boot to the point where it displays anything on the console. When power cycled, the 'SYST' light flashes green a few times, then comes on a solid green and stays lit. None of the other lights ever flash or light up. Holding down the 'MODE' button for up to 30 seconds produces no noticeable effects. Nothing ever comes out on the console. Since I was able to configure the first one without any problems, I know my connectinon is good -- console port configured right, good cable, etc. Is this just a hardware problem with the switch? Is there any way I can recover from this and get the switch back into a state where I can configure it?

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• Sendmail: external alias not receiving relayed mail under certain circumstances.

  - by ben

  I have set up an alias in /etc/mail/aliases like this: user: [email protected] This relay DOES work when I telnet to example.com 25 and send mail to [email protected] (where example.com is my domain); it indeed turns up in [email protected] inbox. Also mail sent from my server at example.com is generally deliverable to this same email address, [email protected]. HOWEVER, the relay DOES NOT work when I send mail from [email protected] to [email protected], expecting it to be relayed back to [email protected]. The mail.log shows it being received and sent just fine, so I guess it is being blocked by gmail for some reason. Why though? As I said, gmail generally does except mail from this server.

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• Windows 2003 SMTP virtual server, why emails are not delivered?

  - by bardan

  Configured Windows 2003 as my email client, everything works fine with POP3 (i'm able to recieve emails), the problem is with SMTP and i can't figure out how to find where excatly this problem is, because email looks like it is sent, but recipients don't recieve anything... i had some problems with relying, but fixed everything, and now i configured outlook express on the same machine, trying to send emails and it looks everything fine, email goes to SENT folder, no errors, but recipients (tried several diffrent) don't revieve any letters... tried to test from the same machine with telnet like it described there http://support.microsoft.com/kb/153119 ant everything looks ok...

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• Can't Allow Specific Port in Windows Firewall Advanced Security - Windows 2008

  - by Jody

  In the Outbound Rules, I set up a rule to allow outbound connection from port 26. But, it doesn't work. However, if I allow "all port" for this rule, this will work, but then all ports will be allowed too. What is the reason? Is there any conflicting rule? I need to fix this as soon as possible. -Edit to add : I'm trying to allow email access to mail server outside (port 26). The thing is, even if I telnet using port 26, it will not work, unless I allow "all ports". Specific port will not do.

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• Setting up dovecot on OpenBSD

  - by Jonas Byström

  I'm a *nix n00b that just installed dovecot (the selection with no ldap, mysql or pgsql) on OpenBSD 4.0 and I want to set it up for imap use, but I'm having a hard time finding documentation that I can understand. It currently running on port 143 (checked with telnet) but from there I need to do the following: I need some accounts, the once already on the system are fine if I can get those running (seemed to be some dovecot option somehow?), or just adding a few manually is ok too. Was there some setting for this in the default /etc/dovecot.conf? passdb bsdauth {} is uncommented by default... I need to create imap folders, or subfolders. How can I do that? Hopefully not, but anything else I need to do? I want to run without certification validation and no SSL/TLS, would this work by default (client-side settings)?

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• Windows Server 2008 r2 Hardening [on hold]

  - by Natasha

  I have created windows server 2008 r2, running on VM, Where Running services in Server Manager 1) File services ( in Role) 2) Telnet Client ( Features) Windows Firewall Disabled and we are using TOMCAT APACHE WEB SERVER, here i want to harden the windows server, While running SCW by simply clicking with default NEXT, at last when i have clicked SAVE and RUN now in SCW, immediately my remote desktop services disabled. May I Know the things i want to add in Roles,features and finally want to harden windows ? and also what about audit policy and network settings in that ? Please help me out, Don't Ignore.

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• What you'd need to setup BBS?

  - by raspi

  What I need to setup BBS nowadays? I'm thinking of BBBS or PCBoard (no telnet! too new technology). What I've thinked so far, I'd need: virtual machine which runs DOS and hook that virtual COM-port to somekind of virtual VoIP modem software somehow (is there any?). How you can call to it across internet? Can you use HyperTerminal straight with that virtual/real modem? Or will VoIP just garble the modem data and nothing will work?

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• http server connectivity puzzle

  - by jpmartins

  I have been seeing some strange connection issue in the production environment. The setup has two IBM Http Server's (IHS) and a network IP load-balancer in front of them (round-robin). One instance the system is working fine, the next requests stop arriving at the IHS. Telnet directly to port 80 of the IHS is established sucessfully, but connection to the port 80 through the IP of the load-balancer fails! The puzzle comes next, the network admins say the load-balancer is working fine. When we finally reboot the IHS servers and request start flowing... The situation happened three times the last month and no obvious pattern was found. Any debug ideas?

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• block access to wrt from vlan using iptables dd-wrt

  - by NitroxDM

  I set up multiple isolated vlans in dd-wrt. Now I need to forward a port to vlan2. I isolated the vlans using: iptables -I FORWARD -i br0 -o vlan2 -j DROP iptables -I FORWARD -i br0 -o vlan3 -j DROP iptables -I FORWARD -i br0 -o vlan4 -j DROP Now I need to block a clients on each vlan from accessing the router. This doesn't work: iptables -I INPUT -i br0 -o vlan2 --dport telnet -j REJECT --reject-with tcp-reset I'm new it iptables... am I missing something?

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• sendmail - DSN: Name Server host not found

  - by Daniel Mitchell

  I've recently setup a new backup server and have configured sendmail with a smart_relay_host Except every email from the command line doesn't go anywhere. From mail.log: Oct 3 14:32:52 **back01 sm-mta[16570]: p93DWqtC016568: to=<[email protected], ctladdr= (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=120762, relay=10.2.30.60, dsn=5.1.2, stat=Host unknown (Name server: 10.2.30.60: host not found) Oct 3 14:32:52 ***back01 sm-mta[16570]: p93DWqtC016568: p93DWqtC016570: DSN: Host unknown (Name server: 10.2.30.60: host not found) DNS is working correctly on this box. I can do forward and reverse lookups. I can also telnet to the mail relay and send a message that way. I'm stumped, any suggestions?

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• How do you setup Postfix/Dovecot/MySQL to not look for local accounts?

  - by thiesdiggity

  I am having an issue with one of my Postfix/Dovecot mail servers and I'm unsure how to fix the problem. I will try to explain it in detail, here it goes: I have an Ubuntu server setup using Virtual hosting with Postfix, Dovecot and MySQL. We have one domain setup as a virtual domain, for this example I am going to use mail.example.com. Under that domain we have one email address. I have another server (MS Exchange) setup using another one of my sub-domains, ex.example.com. The problem is that when I SMTP into the account on mail.example.com and try to send an email to an account on ex.example.com, I get the email returned back to us with an "unknown host" error. Now, I know that the mail.example.com server can resolve the ex.example.com domain because I can ping/dig while SSH'd into it. I can also log into Postfix via Telnet and send an email to an ex.example.com mailbox. I'm guessing that it has something to do with Postfix/Dovecot looking locally for the domain in the virtual domain list because of the tld domain (example.com)? If that's the case, how do I get Postfix/Dovecot to only look locally for the entire URL (mail.example.com) and if it doesn't find it, send it to the correct server by looking up the MX/A records (which I know exist and are setup correctly)? I have been working on this all day and any guidance would be GREATLY appreciated! Thanks for your time!

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• Authentication issues setting up iRedMail on Debian

  - by Sergio Rinaudo

  I'm setting up an exchange server using iRedMail. Following the official iRedMail installation guide (http://www.iredmail.org/install_iredmail_on_debian.html) and the Digital Ocean guide (https://www.digitalocean.com/community/articles/how-to-install-iredmail-on-ubuntu-12-04-x64) I was able to install iRedMail without any problems, so I have all the services up and running. I can configure domains and emails using iRedAdmin BUT I have problem both sending and receiving email, what I get from Roundcube is 'Authentication error' when trying to send an email. Also I can't receive anything. I also tried to connect to the mx server using telnet, it connects, but after the STARTTLS command, when I start to write "MAIL FROM:" the connection is lost. Something in the configuration is not working (at the moment I have the configuration written by the iRedMail installation) but I do not know where, I hope someone can enlight me! Thank you

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• WAMP can connect to localhost but not 127.0.0.1

  - by Anagio

  I'm running WAMP which was working fine the other day. Today I tried connecting to 127.0.0.1 and my browser throws a 404. Both firefox and chrome. My hosts file is correct mapping 127.0.0.1 to localhost. I can telnet to both the IP and localhost port 80 and see a response from apache. When I go to localhost I see the WAMP landing page. I can go to localhost/folder and view the applications just fine. What can be causing the 404's when I go to 127.0.0.1?

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• Emails Generated From Our Linux Server are Blocked By Our Exchange Server (That Has Barracuda)

  - by Scott

  We have our company website hosted on a Linux machine. It is sending mail via postfix. The emails are working and being sent to all email clients like Gmail. However, we are not receiving the emails on our exchange server. When we look at the logs, we see that the connection is being refused, presumably by the exchange server. postfix/qmgr[11865]: DA6D42FF13: from=<[email protected]>, size=3166, nrcpt=1 (queue active) postfix/smtp[12474]: connect to mail.sanitizeddomain.com[XXX.XXX.XXX.XXX]:25: Connection refused postfix/smtp[12474]: DA6D42FF13: to=<[email protected]>, relay=none, delay=172915, delays=172914/0.03/0.07/0, dsn=4.4.1, status=deferred (connect to mail.sanitizeddomain.com[XXX.XXX.XXX.XXX]:25: Connection refused) We do run Barracuda. We cannot telnet from the linux machine to our mail server b/c we get the same message.

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• Exchange unable to relay mail outbound

  - by Saif Khan

  I have some users congigured in exchange 2003 (delivery options tab) to forward mails to their external address. This was working fine until today. The mails are being held up in the SMTP queue folder. I am able telnet the addresses (e.g. google.com) at port 25 from the server. Any reason why the mails are held up? Other emails are going ou. It's only the mailboxes configured to forward the mail out to the public email addresses. I also did the following Check event logs for errors. Nothing. Checked my domain on blacklists. Nothing. Any idesa?

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• Unable to connect to remote MS SQL Server 2008 Express SP3 instance by name

  - by Max

  I am trying to connect to a remote MS SQL Server 2008 SP3 x86 Instance using it's name. At the first glance all seems to work well (e.g. it is possible to connect to the server locally and succesfully telnet it's port remotely), but there is a thing I can't understand... This line should connect us to the default instance of remote SQL Server: osql -S ServerIP -d MyDatabase /U sa -P MyPassword and it does the trick, however the next one: osql -S ServerIP\MyInstance -d MyDatabase /U sa -P MyPassword ends up with the following error: [SQL Native Client]SQL Network Interfaces: Error Locating Server/Instance Specified [xFFFFFFFF]. [SQL Native Client]Login timeout expired [SQL Native Client]An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. The only instance running on the server is MyInstance, which is (I guess) the default one. Could you please put some time in explaining the issue.

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• What should be the path for storing Maildir e-mails?

  - by Thufir

  Am I storing e-mails to the correct path? Working from the dovecot-postfix package I'm able to deliver e-mails to myself as so: thufir@dur:~$ thufir@dur:~$ telnet localhost 25 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 dur.bounceme.net ESMTP Postfix (Ubuntu) HELO me 250 dur.bounceme.net mail from:<[email protected]> 250 2.1.0 Ok rcpt to:<thufir@localhost> 250 2.1.5 Ok data 354 End data with <CR><LF>.<CR><LF> subject: to evolution mail we'll see if this goes through. . 250 2.0.0 Ok: queued as 43D6F2A07C1 quit 221 2.0.0 Bye Connection closed by foreign host. thufir@dur:~$ and then here's the message: thufir@dur:~$ ll Maildir/new/ total 20 drwx------ 2 thufir thufir 4096 Nov 16 18:56 ./ drwx------ 5 thufir thufir 4096 Nov 16 18:56 ../ -rw------- 1 thufir thufir 410 Nov 16 11:57 1353095866.M305477P3932.dur,S=410,W=422 -rw------- 1 thufir thufir 424 Nov 16 17:20 1353115248.M841336P2990.dur,S=424,W=436 -rw------- 1 thufir thufir 445 Nov 16 18:56 1353121003.M187706P3838.dur,S=445,W=457 thufir@dur:~$ thufir@dur:~$ nl Maildir/new/1353121003.M187706P3838.dur\,S\=445\,W\=457 1 Return-Path: <[email protected]> 2 X-Original-To: thufir@localhost 3 Delivered-To: thufir@localhost 4 Received: from me (localhost [127.0.0.1]) 5 by dur.bounceme.net (Postfix) with SMTP id 43D6F2A07C1 6 for <thufir@localhost>; Fri, 16 Nov 2012 18:55:55 -0800 (PST) 7 subject: to evolution mail 8 Message-Id: <[email protected]> 9 Date: Fri, 16 Nov 2012 18:55:55 -0800 (PST) 10 From: [email protected] 11 we'll see if this goes through. thufir@dur:~$ Do I perhaps have postfix misconfigured? I ask because evolution seems to use a different path for mail.

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• Azure VM : Connection refused by host

  - by Simon Kérouack

  I recently stopped a subscription with 14 VMs in it and restarted it a few days later. Now all my VMs are working just fine at the exception of 6 used for MongoDB. They respond to ping and so they show as online in the azure dashboard but they do not answer to anything else. I tried (from different locations, in and out of the azure cloud) ssh : connect to host * port *: Connection refused telnet : Unable to connect to remote host: Connection refused mongo : exception: connect failed The ports for ssh and mongo are opened in azure. I tried restarting the VMs a few times trough the azure dashboard, they seem to restart successfully but still refuse all connections. I already looked for similar issues and the best solutions I found was to wait... the issue has been happening for 7 days and waiting is no more an option.

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• Can only connect to IIS site through localhost

  - by Rembrandt Q. Einstein

  I'm building a web service for my company's iPhone application, and everything's been working smoothly by running tests through localhost on the development machine. I'm now in the phase where I need to test connections from other computers within the network, and any connection other than localhost gives me a 404. My internal IP, 127.0.0.1, and computername all get 404 when connecting from any computer, either the one the site's hosted on or any others on the network. Telnet can get through to port 80, and I've temporarily disabled all firewalls on this machine (I do not have control over the external firewall, but I'm only testing connections within the network) Does anyone have a clue why this is happening? I was able to connect to the web service from other computers when hosted on a Mac via Apache, but because I'm now using a SQL Server connection I'm restricted to using IIS for Windows Authentication. Googling only provided answers related to firewalls, and mine is disabled note: I cannot use Anonymous Authentication, but even in testing that it did not affect the issue.

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• postfix smtps issue

  - by DavidC

  Im currently experiencing the following issue with postfix over ssl (smtps) Apr 7 13:43:55 server88-208-248-147 postfix/smtpd[5777]: connect from xxxxxxxxxxxxxxx[xxx.xxx.xxx.xxx] Apr 7 13:45:09 server88-208-248-147 postfix/smtpd[5777]: lost connection after UNKNOWN from xxxxxxxxxxxxxxx[xxx.xxx.xxx.xxx] Apr 7 13:45:09 server88-208-248-147 postfix/smtpd[5777]: disconnect from xxxxxxxxxxxxxxx[xxx.xxx.xxx.xxx] my main.cf is as follows: smtpd_tls_cert_file = /etc/postfix/smtpd.cert smtpd_tls_key_file = /etc/postfix/smtpd.key smtpd_use_tls = yes smtp_use_tls = yes smtpd_tls_auth_only = no smtpd_tls_CAfile = /etc/postfix/caroot.crt smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_tls_loglevel = 1 when accessing smtp and running start tls i get the following: # telnet xxxxxxxxxxxxxxx 25 Trying xxxxxxxxxxxxxxx... Connected to xxxxxxxxxxxxxxx . Escape character is '^]'. 220 xxxxxxxxxxxxxxx ESMTP Postfix ehlo localhost 250-xxxxxxxxxxxxxxx 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-STARTTLS 250-AUTH PLAIN LOGIN 250-AUTH=PLAIN LOGIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN STARTTLS 220 2.0.0 Ready to start TLS please help as i'm lost of places to look now. os is Ubuntu 10.4 and the SSL is a wildcard SSL, imap/pop and apache work flawlessly with the same certificate.

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• How do you access usermin

  - by Lobe

  I have recently setup a web server with webmin, virtualmin and usermin on CentOS to host some websites and email, however I am unable to access usermin. I can access webmin from www.foobar.com:10000 but I can't access usermin from www.foobar.com:20000 This thread seems to have dealt within the same issue, however when I tried the command "telnet localhost 20000" it came back with a connection refused message. Any idea how to get this running. I'll let you know in advance that I am a linux newbie and this is a large learning experience, so don't rule out anything if you are thinking "oh, but he wouldn't be dumb enough to forget that" or the like

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• Windows 7 - XP Mode - Apache

  - by Howard

  I've setup Virtual PC and XP Mode on my Windows 7 Pro. Using Apache 2.0.52 I have no problems having my website up and running on the Windows 7 machine. But Under VPC/XP Mode the best I can do is Localhost mode. What do I need to do to enable http connections? I need the XP Mode as besides the website I also run a Web BBS and a Dos based (via telnet) BBS. Some of the apps in the Dos BBS just won't work under 64 bit, no matter what setting (capability) are used. Thanks in advance...

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• Utility to listen on port (Windows 2003 Server)

  - by Gero

  Hi, I need to validate some network connectivity from machine X to a Windows 2003 Server machine. To be able to do so I'm looking for a simple utility that I can run on the Windows 2003 server that will listen on a specified port. It does not have to do anything else. When it listens on the specified port I can do a telnet to that port from machine X and check if all firewalls are open. The Windows 2003 Server machine is already a production machine so I cannot install all kinds of stuff. At this stage we want to ensure that all network connectivity is in place before we do the installation of the 'real' application that will listen that port (don't want to wast time debugging network connectivity issues when we do the actual deployment of the new application. The utility should be a simple command line utility that does not require any installation. What utilities do you recommend? Thanks, Gero

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• Cannot connect to HTTPS port on Ubuntu

  - by Simpleton

  I've installed a new SSL certificate and set up Nginx to use it. But requests time out when trying to hit HTTPS on the site. When I telnet to my domain on port 80 it connects, but times out on port 443. I'm not sure if there's some defaults on Ubuntu preventing a connection. UFW status shows: 443 ALLOW Anywhere netstat -a shows: tcp 0 0 *:https *:* LISTEN nmap localhost shows: 443/tcp open https The relevant block in the Nginx config is: server { listen 443; listen [::]:80 ipv6only=on; listen 80; root /path/to/app; server_name mydomain.com ssl on; ssl_certificate /etc/nginx/ssl/ssl-bundle.crt; ssl_certificate_key /etc/nginx/ssl/server.key; location / { proxy_pass http://mydomain.com; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } }

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• localhost works 127.0.0.1 does not IIS

  - by NickatUship

  Very weird problem on IIS. Never had it before: localhost works, but 127.0.0.1 does not. localhost pings to 127.0.0.1. www.mydomain.com also pings to that IP, which is set up in the hosts file, but that also doesnt work locally. I've ipconfig /flushdns 'd without success. Ive even restarted the server. Another server set up the exact same way works fine. Any ideas? To be clear, im accessing the URLs in IE like this: http://localhost http://127.0.0.1 http://www.mydomain.com I can telnet to port 80 without a problem for all 3

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