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Full Discussion: How to block FTP ,SMTP,Telnet services?
Top Forums UNIX for Dummies Questions & Answers How to block FTP ,SMTP,Telnet services? Post 302451820 by pinga123 on Wednesday 8th of September 2010 06:29:07 AM
Old 09-08-2010
Quote:
Yes, it seems telnet is not active and the config for xinetd is not installed.
To make sure you can show the contents of /etc/xinetd.d. If there is a file called telnet and one called ftp, you can check inside them - there should be a parameter called "disable" which might be already set to "= yes".
I guess telnet part i m pretty OK.Now i can enable or disable telnet service by my own.
Let us concentrate on FTP now .SMTP will be handlled later as i m finding it very difficult to handle everything.BTW thanks for your support you are indeed very helpful.

Quote:
For ftp I already mentioned to do the same as with telnet - you might have overlooked it:
Code:
# ls /etc/xinetd.d
chargen-dgram   discard-dgram   eklogin       krb5-telnet      tcpmux-server
chargen-stream  discard-stream  ekrb5-telnet  krb5-telnet.old  tftp
daytime-dgram   echo-dgram      gssftp        kshell           time-dgram
daytime-stream  echo-stream     klogin        rsync            time-stream

There are two files called gssftp and tftp .Which one should i modify?
Code:
# ftp localhost
ftp: connect: Connection refused
ftp> bye

FTP is already blocked but i would like to know how to enable it?
 

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LEARN ABOUT HPUX

nstrtel

nstrtel(5)							File Formats Manual							nstrtel(5)

NAME

       nstrtel - specifies the number of telnet device files the kernel can support for incoming telnet sessions

VALUES

   Failsafe
   Default
   Allowed values
       (Subject to available physical memory.)

       It  is best to use the default value, and there should not be any need to lower it.  However, if the simultaneous telnet connection load is
       very high, then the value of could be increased.

   Recommended values
       (Default value.)

DESCRIPTION

       The telnet daemon uses two STREAMS-based pseudo-terminal drivers and The kernel parameter, can be used to tune the number of  pseudo-termi-
       nals.   specifies  the  number of kernel data structures that are created at system boot time that are required to support the device files
       used by incoming telnet sessions on a server.  If the command or SAM is used to create more telnet device  files,  the  value  of  must	be
       increased  accordingly  or the device files cannot be used because there are no kernel data structures available for communicating with the
       system.

   Who Is Expected to Change This Tunable?
       Anyone.

   Restrictions on Changing
       Changes to this tunable take effect at the next reboot.

   When Should the Value of This Tunable Be Raised?
       When there is an increase in the load of telnet connections and there are no device files available to open telnet connections,	then  this
       kernel parameter should be increased.

       When  the error is encountered, then the device files have been exhausted and should be raised.	Once the value of is raised, should be run
       to create new device files.  (If SAM is used to raise the value of is run automatically.)

   What Are the Side Effects of Raising the Value of This Tunable?
       More resources would be consumed.  Extra kernel data structures, and extra device files may clog the system.

   When Should the Value of This Tunable Be Lowered?
       It is not advisable to lower the tunable value from the default value.  Consult HP Support before lowering this tunable	from  the  default
       value.

   What Are the Side Effects of Lowering the Value of This Tunable?
       Though not recommended, there would not be any side effects.

   What Other Tunables Should Be Changed at the Same Time?
       None.

WARNINGS

       All  HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may cause changes to tunable  parameter  values.   After  installation,
       some  tunable  parameters may no longer be at the default or recommended values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

SEE ALSO

       insf(1M), telnetd(1M), telm(7), tels(7).

							     Tunable Kernel Parameters							nstrtel(5)
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