+ Post New Thread
Results 1 to 11 of 11
Windows Thread, Telnet not working (Port25) in Technical; Hi All, Quick question. I cannot telnet from a certain server. It has been recently rebuilt Windows 2003 Standard + ...
  1. #1
    ahuxham's Avatar
    Join Date
    Apr 2008
    Posts
    1,122
    Thank Post
    76
    Thanked 138 Times in 109 Posts
    Rep Power
    30

    Telnet not working (Port25)

    Hi All,

    Quick question. I cannot telnet from a certain server. It has been recently rebuilt Windows 2003 Standard + SP2.

    Trying telnet server 25 in CMD and it says "Could not open connection to host". However running this from my laptop, and I get in straight away, same with all the other servers. Windows firewall is not enable, there are no port blocks or anything along those lines.

    Just find it bemusing it isn't working. It has software on it, thats meant to send quite a bit of mail traffic through. Which would be SMTP:25. (Same installing the program on my machine, it works correctly)

    Any reason Port 25 would be blocked? Or anyway to find if something is using that port.

    Many Thanks

  2. #2

    Join Date
    Feb 2006
    Location
    Derbyshire
    Posts
    1,381
    Thank Post
    181
    Thanked 211 Times in 171 Posts
    Rep Power
    65
    Do you mean you cannot telnet from the server to another server, or you cannot telnet to the newly rebuilt server on its SMTP port? Got a bit lost in your first couple of lines...

    If it's not being able to telnet from it, does your network firewall have restrictions by IP/MAC address as to what protocols may be used? Is it a DNS issue - tried telnet ip 25 ?

  3. #3
    Netman's Avatar
    Join Date
    Jul 2005
    Location
    56.343515, -2.804118
    Posts
    911
    Thank Post
    367
    Thanked 190 Times in 143 Posts
    Rep Power
    54
    Is the SMTP service installed and running on the server?

  4. #4
    ahuxham's Avatar
    Join Date
    Apr 2008
    Posts
    1,122
    Thank Post
    76
    Thanked 138 Times in 109 Posts
    Rep Power
    30
    Not a DNS setting thats for sure, same error appears with an IP address

    Server to Server (telnet works) APART!! From this one server, which has recently been rebuilt.

    The only IP/MAC Firewall filtering in-place is inbound gateway, on the staffs internet gateway (BIND-IP to MAC) Vigor3300, but thats outside, not inside

  5. #5
    ahuxham's Avatar
    Join Date
    Apr 2008
    Posts
    1,122
    Thank Post
    76
    Thanked 138 Times in 109 Posts
    Rep Power
    30
    Quote Originally Posted by Netman View Post
    Is the SMTP service installed and running on the server?
    On the server the software is running from, or the server I'm trying to telnet too.


    Wsusserver (Has Ilient Sysaid installed) Its supposed to send email notification on tickets and servers that are down via SchoolMailServer. Settings are all correct however, it wont send the SMTP request to the SchoolMailServer.

    However, if I install Sysaid on my laptop, and configure it exactly as above, it routes the notifications (or rather sends them) via the Mail Server.

  6. #6

    Michael's Avatar
    Join Date
    Dec 2005
    Location
    Birmingham
    Posts
    9,241
    Thank Post
    239
    Thanked 1,567 Times in 1,249 Posts
    Rep Power
    339
    Does the problem happen over wireless or wired? If wireless it might be your AP blocking Telnet.

  7. #7
    ahuxham's Avatar
    Join Date
    Apr 2008
    Posts
    1,122
    Thank Post
    76
    Thanked 138 Times in 109 Posts
    Rep Power
    30
    Quote Originally Posted by Michael View Post
    Does the problem happen over wireless or wired? If wireless it might be your AP blocking Telnet.
    Wired. The telnet command is only really there as the end solution, more along the lines of trying to see if the server is routing smtp traffic properly which its not.

    Another point, working from my Laptop, I'm the only one without Mcafee AV on, while the servers and all other workstations have it. Having tripple checked other machines, they cannot telnet, where I can.

    I cannot see anything in the server policies nor workstation policies covering telnet, or any SMTP traffic scanning anywhere.

  8. #8

    Michael's Avatar
    Join Date
    Dec 2005
    Location
    Birmingham
    Posts
    9,241
    Thank Post
    239
    Thanked 1,567 Times in 1,249 Posts
    Rep Power
    339
    You could experiment and remove McAfee off one workstation temporarily and see if it works. If it's just the AV then that would be strange, but I know McAfee also do a security suite, which would include spyware and firewall too.

  9. #9
    ahuxham's Avatar
    Join Date
    Apr 2008
    Posts
    1,122
    Thank Post
    76
    Thanked 138 Times in 109 Posts
    Rep Power
    30
    Quote Originally Posted by Michael View Post
    You could experiment and remove McAfee off one workstation temporarily and see if it works. If it's just the AV then that would be strange, but I know McAfee also do a security suite, which would include spyware and firewall too.
    Will do, but at present we don't have Firewall/Spyware packages installed, just pure Virus Scan.

  10. #10

    Join Date
    Feb 2006
    Location
    Derbyshire
    Posts
    1,381
    Thank Post
    181
    Thanked 211 Times in 171 Posts
    Rep Power
    65
    I have McAfee Enterprise V8 AV installed here - it still has some basic firewall/port blocking functionality. Look in console for the the configuration for "Access Protection" - under Access Protection Properties there is a rule "Stop mass mailing worms from sending email" which blanket blocks outbound port 25 apart from programs in the exclusions list, which contains

    "amgrsrvc.exe,tomcat.exe,outlook.exe,msimn.exe,age nt.exe,eudora.exe,nlnotes.exe,mozilla.exe,netscp.e xe,opera.exe,winpm-32.exe,pine.exe,poco.exe,thebat.exe,thunderbird.ex e,ntaskldr.exe,inetinfo.exe,nsmtp.exe,nrouter.exe, tomcat5.exe,tomcat5w.exe,ebs.exe,FireSvc.exe,modul ewrapper.exe,MSKSrvr.exe,MSKDetct.exe,mapisp32.exe " on my system but strangely no telnet. Whack telnet.exe or whatever executable is supposed to be sending mail in and you're sorted. Probably.

  11. Thanks to OutToLunch from:

    ahuxham (24th April 2008)

  12. #11
    ahuxham's Avatar
    Join Date
    Apr 2008
    Posts
    1,122
    Thank Post
    76
    Thanked 138 Times in 109 Posts
    Rep Power
    30
    Thanks for that OutToLunch, solved the problem perfectly.

SHARE:
+ Post New Thread

Similar Threads

  1. Telnet Scripting TFTP Updates
    By plexer in forum Wireless Networks
    Replies: 6
    Last Post: 3rd November 2006, 10:34 AM
  2. Windows Telnet
    By tickmike in forum Windows
    Replies: 8
    Last Post: 7th September 2006, 02:26 PM
  3. Telnet 2.0 ?
    By dagza in forum Jokes/Interweb Things
    Replies: 6
    Last Post: 12th July 2006, 10:08 AM
  4. ISO not working
    By Gatt in forum Learning Network Manager
    Replies: 4
    Last Post: 9th July 2006, 07:13 PM

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •