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• How to stop tcpdump remotely using expect from a new telnet session

  - by The CodeWriter

  I am trying to stop the tcpdump command from running on a remote terminal. If I telnet to the terminal, start tcpdump, and then send a ^c, tcpdump stops with no issues. However if I telnet to the same terminal, start tcpdump, and then exit the telnet session, when I reconnect to the same telnet session I am unable to stop tcpdump via a ^c. When I do this instead of stopping tcpdump it seems that it just quits the telnet session and tcpdump continues to run on the remote terminal. I provided my script below. Any help is greatly appreciated. #!/usr/local/bin/expect -f exp_internal 1 set timeout 30 spawn /bin/bash expect "] " send "telnet 192.168.62.133 10006\r" expect "Escape character is '^]'." send "\r" expect "# " set now [clock format [clock seconds] -format {%d_%b_%Y_%H%M%S}] set command "tcpdump -vv -i trf400 ip proto 89 -s 65535 -w /tmp/test_term420_${now}.pcp " send "$command\r" expect "tcpdump: listening on" # This works correctly. tcpdump quits and I am returned to the expected prompt send "\x03" expect "# " send "$command\r" expect "tcpdump: listening on" # Exit telnet session send -- "\x1d" expect "telnet> " send -- "q\r" expect "] " # Reconnect to telnet session send "telnet 192.168.62.133 10006\r" expect "Escape character is '^]'." send "\r" # This does not work as intended. The ^c quits the telnet session instead of stopping tcpdump send "\x03" expect "] " send "ls\r" expect "] "

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• Telnet blocked on windows 2003,how to find the root cause and unblock?

  - by unknown

  I've already shut down the firewall. Is there a way to check what is actually blocking telnet?

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• how to protect telnet access to smtp port 25?

  - by Michael Mao

  Hi all: Please consider the following: 192-168-1-106:~ michael$ telnet <remote_server_ip> 25 Trying <remote_server_ip>... Connected to li*****.linode.com. Escape character is '^]'. 220 mindinscription.net ESMTP Postfix (Ubuntu) quit 221 2.0.0 Bye Connection closed by foreign host. Is this very bad? how to protect port 25 from malicious attackers? I've already set up a firewall, but not very sure what to do in this case. Basically I'd like to use this server to only send emails as alert messages, not receiving any external emails. Many thanks to the help in advance.

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• How to create tunnel to utilize for telnet connection.

  - by Z12

  The scenario is as follows: Machine A is located behind client firewall. The machine runs telnetd. This is Linux machine with Python 2.5.4 installed. I do not know the IP addy of the router and firewall is not open incoming. outgoing firewall is open. Machine B (Windows machine) is a server with well known IP address. I can install any programs I want on either machine. The idea is that I want Machine A to open a socket to machine B. Then I want to hold that socket and use to run a telnet session from Machine B to Machine A telnetd server. Is there any freeware that does this? Thoughts? Thanks!

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• How can I access a shared Exchange mailbox with IMAP (over telnet)?

  - by gauteh

  I have an Mailbox which multiple users have access to, it works fine for me and I can add it in Outlook as an additional mailbox to my account and list all its content. I can access my personal mailbox using IMAP, I'm testing it by just telneting in and LIST'ing it. The problem is that another user trying to access it is having problems accessing it through IMAP; and I want to test if I can access the shared mailbox with my account - how can I do that in terms of IMAP commands? What I am doing now is: telnet mail.server 01 LOGIN user pass 02 LIST "" * 03 LOGOUT Edit: If there is another way to test this, that is an equally good answer.

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• postfix: Temporary lookup failure for FQDN

  - by Thufir

  I'm using the FQDN of dur.bounceme.net which I want to resolve(?) to localhost. That is, I want mail to [email protected] to get delivered to user@localhost. I've tried following the Ubuntu guide on this and seem to be going in circles a bit. root@dur:~# root@dur:~# postfix stop postfix/postfix-script: stopping the Postfix mail system root@dur:~# postfix start postfix/postfix-script: starting the Postfix mail system root@dur:~# telnet dur.bounceme.net 25 Trying 127.0.1.1... telnet: Unable to connect to remote host: Connection refused root@dur:~# root@dur:~# telnet localhost 25 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 dur.bounceme.net ESMTP Postfix (Ubuntu) ehlo dur 250-dur.bounceme.net 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-STARTTLS 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN mail from:[email protected] 250 2.1.0 Ok rcpt to:[email protected] 451 4.3.0 <[email protected]>: Temporary lookup failure rcpt to:thufir@localhost 451 4.3.0 <thufir@localhost>: Temporary lookup failure quit 221 2.0.0 Bye Connection closed by foreign host. root@dur:~# root@dur:~# grep telnet /var/log/mail.log Aug 28 00:24:45 dur postfix/smtpd[18256]: NOQUEUE: reject: RCPT from localhost[127.0.0.1]: 451 4.3.0 <thufir@localhost>: Temporary lookup failure; from=<[email protected]> to=<thufir@localhost> proto=ESMTP helo=<dur> Aug 28 00:24:58 dur postfix/smtpd[18256]: NOQUEUE: reject: RCPT from localhost[127.0.0.1]: 451 4.3.0 <[email protected]>: Temporary lookup failure; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<dur> Aug 28 00:54:55 dur postfix/smtpd[18825]: NOQUEUE: reject: RCPT from localhost[127.0.0.1]: 451 4.3.0 <[email protected]>: Temporary lookup failure; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<dur> Aug 28 00:55:08 dur postfix/smtpd[18825]: NOQUEUE: reject: RCPT from localhost[127.0.0.1]: 451 4.3.0 <thufir@localhost>: Temporary lookup failure; from=<[email protected]> to=<thufir@localhost> proto=ESMTP helo=<dur> root@dur:~# root@dur:~# postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes config_directory = /etc/postfix default_transport = smtp home_mailbox = Maildir/ inet_interfaces = loopback-only mailbox_command = /usr/lib/dovecot/deliver -c /etc/dovecot/conf.d/01-mail-stack-delivery.conf -m "${EXTENSION}" mailbox_size_limit = 0 mailman_destination_recipient_limit = 1 mydestination = dur, dur.bounceme.net, localhost.bounceme.net, localhost myhostname = dur.bounceme.net mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 readme_directory = no recipient_delimiter = + relay_domains = lists.dur.bounceme.net relay_transport = relay relayhost = smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtp_use_tls = yes smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_recipient_restrictions = reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_authenticated_header = yes smtpd_sasl_local_domain = $myhostname smtpd_sasl_path = private/dovecot-auth smtpd_sasl_security_options = noanonymous smtpd_sasl_type = dovecot smtpd_tls_auth_only = yes smtpd_tls_cert_file = /etc/ssl/certs/ssl-mail.pem smtpd_tls_key_file = /etc/ssl/private/ssl-mail.key smtpd_tls_mandatory_ciphers = medium smtpd_tls_mandatory_protocols = SSLv3, TLSv1 smtpd_tls_received_header = yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes tls_random_source = dev:/dev/urandom transport_maps = hash:/etc/postfix/transport root@dur:~#

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• non-privileged normal user passing environment variables to /bin/login [closed]

  - by AAAAAAAA

  Suppose that in FreeBSD (or linux maybe) there is a non-privileged normal user (non-superuser). And there is a telnet standalone (I know that telnet is usually run under inetd) running under (owned by) this user. (Suppose that there was no original, root-owned telnet running.) This telnet server is programmed so that it does not check ld_* environment variables before passing it to /bin/login owned by root that has setuid set up. The question would be: 1. Will this telnet work? 2. If it does work, will it even be able to pass environment variables to /bin/login?

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• Isn't localhost simply 127.0.0.1 on Mac OS X 10.7 (Lion)?

  - by z-buffer

  I tried telnet localhost on Mac OS X Lion, and this is the output I got. Trying ::1... telnet: connect to address ::1: Connection refused Trying 127.0.0.1... telnet: connect to address 127.0.0.1: Connection refused Trying fe80::1%lo0... telnet: connect to address fe80::1%lo0: Connection refused telnet: Unable to connect to remote host: Connection refused It tries three different addresses. I would have expected it to only try 127.0.0.1, or at least to try it first. What are these other addresses?

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• Monitoring memcached with plink

  - by kojiro

  I need a telnet client that can take commands from a file or stdin so I can do some quick-and-dirty automatic monitoring of memcached. I thought plink would be good for this, but it seems to be doing something beyond what I need: If I telnet into localhost 11211 and write stats, I get the memcached stats, like so: $ telnet localhost 11211 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. stats STAT pid 25099 STAT uptime 91182 STAT time 1349191864 STAT version 1.4.5 STAT pointer_size 64 STAT rusage_user 3.570000 STAT rusage_system 2.740000 STAT curr_connections 5 STAT total_connections 23 STAT connection_structures 11 STAT cmd_get 0 STAT cmd_set 0 STAT cmd_flush 0 STAT get_hits 0 STAT get_misses 0 STAT delete_misses 0 STAT delete_hits 0 STAT incr_misses 0 STAT incr_hits 0 STAT decr_misses 0 STAT decr_hits 0 STAT cas_misses 0 STAT cas_hits 0 STAT cas_badval 0 STAT auth_cmds 0 STAT auth_errors 0 STAT bytes_read 82184 STAT bytes_written 7210 STAT limit_maxbytes 67108864 STAT accepting_conns 1 STAT listen_disabled_num 0 STAT threads 4 STAT conn_yields 0 STAT bytes 0 STAT curr_items 0 STAT total_items 0 STAT evictions 0 STAT reclaimed 0 END But with plink, I get an odd error. I'm using this command: watch -n 30 plink -v -telnet -P 11211 127.0.0.1 <<< $'\nstats' The first time through I get: Looking up host "127.0.0.1" Connecting to 127.0.0.1 port 11211 client: WILL NAWS client: WILL TSPEED client: WILL TTYPE client: WILL NEW_ENVIRON client: DO ECHO client: WILL SGA client: DO SGA ERROR STAT pid 25099 STAT uptime 91245 STAT time 1349191927 STAT version 1.4.5 … END But when watch repeats the command I just get: Looking up host "127.0.0.1" Connecting to 127.0.0.1 port 11211 client: WILL NAWS client: WILL TSPEED client: WILL TTYPE client: WILL NEW_ENVIRON client: DO ECHO client: WILL SGA client: DO SGA Failed to connect to 127.0.0.1: Connection reset by peer Connection reset by peer FATAL ERROR: Connection reset by peer What is plink doing here that is different from normal telnet? How should I be going about this? (I'm not married to plink, but I need a way to continuously send simple telnet commands to memcached without writing a full-fledged perl script.)

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• Simple way to send a telnet command in an iPhone app?

  - by Michael Shnitzer

  Is there a simple way to send a telnet command in an iPhone app?

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• Ant telnet is hanging on a simple task

  - by Sagar

  <?xml version="1.0" ?> <project name="test" default="root"> <target name="telnet"> <telnet server="10.1.1.1"> <read>login:</read> <write>root</write> <read>password:</read> <write>${PASSWORD}</write> <read>#</read> <write>ls</write> <read>#</read> </telnet> </target> </project> That is the code I have in a build.xml file. When I run ant (version 1.8, in bash) (I have downloaded and copied over the jars for commons-net-2.0 and jakarta-oro-2.0.8 already), this is the output I get: Buildfile: /home/sagar/build.xml telnet: and then it just sits there. When I do a "who" on my server, I can see "System" waiting on login. But there is no progress after this. I can telnet into the server using normal telnet means (putty, bash, etc). I even tried the full telnet command instead of read/write: <telnet server="10.1.1.1" userid="root" password="root"> Any help is much appreciated! Note: JRE 1.5, Ant 1.8, commons-net version 2.0, jakarta version 2.0.8

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• CVE-2011-4862 Buffer Overflow vulnerability in Telnet

  - by chandan

  CVE DescriptionCVSSv2 Base ScoreComponentProduct and Resolution CVE-2011-4862 Buffer Overflow vulnerability 7.5 Telnet Solaris 10 SPARC: 148657-01 X86: 148658-01 Solaris 11 11/11 SRU 04 This notification describes vulnerabilities fixed in third-party components that are included in Sun's product distribution.Information about vulnerabilities affecting Oracle Sun products can be found on Oracle Critical Patch Updates and Security Alerts page.

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• Cyrus IMAP: Unable to connect to remote host: Connection refused

  - by Nick

  I'm working on setting up a Cyrus 2.2 IMAP server on Ubuntu Server 9.04. If I telnet from the server itself: # telnet localhost imap I get: * OK IMAP Cyrus IMAP4 v2.2.13-Debian-2.2.13-14ubuntu3 server ready Which is what I should be seeing. If I try from another machine on the network: telnet 192.168.5.122 imap I get: telnet: Unable to connect to remote host: Connection refused UPDATE: From /etc/cyrus.conf # add or remove based on preferences imap cmd="imapd -U 30" listen="imap" prefork=0 maxchild=100 imaps cmd="imapd -s -U 30" listen="imaps" prefork=0 maxchild=100 #pop3 cmd="pop3d -U 30" listen="pop3" prefork=0 maxchild=50 #pop3s cmd="pop3d -s -U 30" listen="pop3s" prefork=0 maxchild=50 #nntp cmd="nntpd -U 30" listen="nntp" prefork=0 maxchild=100 #nntps cmd="nntpd -s -U 30" listen="nntps" prefork=0 maxchild=100 To the best of my knowledge, there is no firewall running on the box. I've tried restarting the saslauthd and cyrus2.2 daemons, with no effect. What else can I try?

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• Cyrus IMAP: Unable to connect to remote host: Connection refused

  - by Nick

  I'm working on setting up a Cyrus 2.2 IMAP server on Ubuntu Server 9.04. If I telnet from the server itself: # telnet localhost imap I get: * OK IMAP Cyrus IMAP4 v2.2.13-Debian-2.2.13-14ubuntu3 server ready Which is what I should be seeing. If I try from another machine on the network: telnet 192.168.5.122 imap I get: telnet: Unable to connect to remote host: Connection refused To the best of my knowledge, there is no firewall running on the box. I've tried restarting the saslauthd and cyrus2.2 daemons, with no effect. What else can I try?

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• OS X 10.7.5 - telnet: connect to address 10.0.0.12: Operation not permitted

  - by user2169619

  I have troubles to connect from macos to reach windows shares and I hit some general problem with my macos. When I try to telnet to 445 port to my windows share server the macos throws "Operation not permitted". I have no firewall rule and I'm not able to google anything. sh-3.2# telnet 10.0.0.12 445 Trying 10.0.0.12... telnet: connect to address 10.0.0.12: Operation not permitted telnet: Unable to connect to remote host Any idea what can be the reason?

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• postfix - connection refused from behind NAT

  - by manchine

  When attempting to telnet postfix from a different host in the same LAN through the FQDN (and thus the LAN's public IP), the following error occurs: root@mailer:/var/log# telnet mail.domain.com 25 Trying 1.2.3.4... telnet: Unable to connect to remote host: Connection refused Other services can be reached from the exact same host, however: root@mailer:/var/log# telnet mail.domain.com 22 Trying 1.2.3.4... Connected to mail.domain.com. Escape character is '^]'. SSH-2.0-OpenSSH_6.0p1 Debian-4+deb7u1 To make matters more intriguing, Postfix can be accessed from outside the LAN: nunos-mbp:mailog nzimas$ telnet mail.domain.com 25 Trying 1.2.3.4... Connected to mail.domain.com. Escape character is '^]'. 220 mail.domain.com ESMTP Postfix (Ubuntu) To sum thing up: a) Postfix (running on 10.10.10.4 / mail.domiain.com) refuses connection from a host in the same LAN (10.10.10.2), but only when queried through the FQDN (mail.domain.com) b) mail.domain.com accepts connections to other services (but Postfix) from 10.10.10.2 c) mail.domain.com accepts connections to all services, including Postfix, from the outside world If it were a firewall issue, then I believe it would not be possible to connect to any service from 10.10.10.2 through the FQSN / public IP. It ought to be some missing parameter in Postfix, although I haven't found any clear pointers so far.

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• Managing Cisco programatically; Telnet vs SNMP?

  - by MikeHerrera

  I was recently approached by a network-engineer, co-worker who would like to offload his minor network admin duties to a junior-level helpdesk tech. The specific location in need of management acts as an ISP for tenants on its single-site property, so there's a lot of small adjustments being made on a daily basis. I am thinking it would be helpful to write him a winform app to manage the 32 Cisco devices, on-site. I'd like to initially provide functionality which could modify access control lists, port VLAN assignments, and bandwidth limitations per VLAN... adding more to the list as its deemed valuable. My initial thought was to emulate a telnet session with the network device; utilizing my network-engineer's familiarity with the command-line / IOS interaction. Minimal time would be required to learn Cisco IOS conventions, myself. Though while searching for solutions, it appears that most people favor SNMP. That, or, their specific circumstances pushed them in the direction of SNMP. I wanted to know if I've overlooked an obvious benefit of SNMP. Should I be using SNMP? Why or why not?

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• POSIX Sockets: How to detect Ctrl-C sent over Telnet?

  - by ogott

  Short Question What's the right way to handle a Ctrl-C event sent over Telnet on the server side? Long Question After calling recv() on a socket, I'd like to handle some situations appropriately. One of them is to return a certain error code when Ctrl-C was received. What's the correct way to detect this? The following works, but it just doesn't seem right: size_t recv_count; static char ctrl_c[5] = {0xff, 0xf4, 0xff, 0xfd, 0x06}; recv_count = recv(socket, buffer, buffer_size, 0); if (recv_count == sizeof(ctrl_c) && memcmp(buffer, ctrl_c, sizeof(ctrl_c) == 0) { return CTRL_C_RECEIVED; } I found a comment on Ctrl-C in a side-note in this UNIX Socket FAQ: [...] (by the way, out-of-band is often used for that ctrl-C, too). As I understand, receiving out-of-band data is done using recv() with a certain flag as the last parameter. But when I'm waiting for data using recv() as I do in the code above, I can't read out-of-band data at the same time. Apart from that, I'm getting something using recv() without that oob-flag.

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• Localhost problems on Mac OS X 10.7

  - by Maya

  Sorry for the duplicate post ( http://stackoverflow.com/questions/9720871/localhost-problems-on-mac-os-x-10-7 ), but I got the advice that this is a better place to ask my question: I want to access a mysql server remotely over ssh. So I used port forwarding to access the remote 3306 port on my localhost as 8383. The ssh connection can established successfully. But when I want to telnet onto port 8383 on localhost I get the following error: ~: telnet 127.0.0.1 8383 Trying 127.0.0.1... telnet: connect to address 127.0.0.1: Connection refused telnet: Unable to connect to remote host I tried the same on a friends Laptop (also Mac OS X 10.7) and it worked fine, so it is very unlikely that the ssh connection is the problem. I assume it has something to do with my local network configuration. I turned off IPv6, just in case. My /etc/hosts looks like this: 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost fe80::1%lo0 localhost I would greatly appreciate any help. Please point me in the right direction if this is not the right place to ask this question.

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• Can't telnet to SQL Server

  - by Thiago

  Hi there, I have an SQL Server running on a computer, and I'm trying to access it from another computer in the same local network (potentially VPN, since it's located in a datacenter). The point is that I can't even telnet to the port in which SQL Server is listening. And yes, SQL Server is working, since I can telnet to it from my workstation. I think it's something in the host, since there's no hop between the two computers, but I don't know how to troubleshoot this. Basically I get a connection failed, when I try to telnet. What can cause such problem, since apparently there's no firewall and the server is accepting connections from other computers? Thanks in advance

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• Can Ping but Cannot Telnet directly to SQL Server 2012 Cluster Nodes

  - by tresstylez

  We have a monitoring tool (Solarwinds Orion) that needs to connect to a 2-node failover SQL Server Cluster. For reasons outside of our control -- we cannot monitor the CLUSTER IP directly at this time, so we have fallen back to monitoring each cluster node IP directly. This is not working. Upon troubleshooting, we tried to test that the cluster node was listening on the proper (fixed) port by using telnet to the cluster node IP/port -- and the telnet failed. However, telnet'ing to the Cluster IP/Port was SUCCESSFUL! Each node has its own IP. Each node is listening on the identical FIXED port. Each node has Dynamic Ports disabled. Each node can be PINGED successfully from the monitoring tool. Windows Firewall is DISABLED. How can I troubleshoot why I cannot telnet to the listening port on the cluster nodes?

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• script to test mail server

  - by WebDude

  Ever since a windows update that took down my IIS6 mail server a few weeks back, I've been really paranoid about my mail server working. So every time I run a windows update I fire up command prompt and send myself a quick test mail. Like so: > telnet localhost 25 > helo domain.com > mail from: [email protected] > rcpt to: [email protected] > data some random body to mail myself . This is a realy great way to test my mail server, but it's a pain in the neck to do quickly. Is there anyway i can run this in a batch script or something as a quick test? I've tried a bat file but this just waits after i call telnet I've also explored if telnet accepts any input files and it does not seem to. What's the best way to do this?

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• Configuration Of modem/router to Telnet IPV6 addr

  - by vito

  Can any one help me to configure the modem/router, so that IPV6 address assigned by modem/router to Pc. I should telnet to that IPV6 address so that i can open the modem/router administration user interface. Now I have enabled the IPV6 in my PC, i am getting a IPV6 address from Modem/router. But not able to telnet to IPV6 address given by modem/router. It is possible to telnet to IPV6 address given by modem/router. I have tried it before. But now i have forgotten the configurations. Configuration snapshot has been attached. Thank you. configuration snapshot

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• OS X Server: SMTP Server problem

  - by plucked

  Hi, I have problem to setup my mail server. My system is a OS X 10.6.2. Server. I configured the mail server so far, but I cannot connect to the smtp server correctly. Correctly means that I can connect via telnet (and do the "HELO") from another server within the same serverrack, but not from outside. But when I try to telnet my http server, it works fine from outside. I already checked my firewall rules with "sudo ipfw list" and the port 25 is not blocked in any case. What could be the problem with connecting to port 25 via telnet from outside of the serverrack? Cheers

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• windows server and telnet, what can you do?

  - by Blankman

  On a windows server (2008), can you even telnet into the server? (not remote desktop, but via the command line) If yes, is there much control really? How do people automate if you can't telnet? (assuming you can't)

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