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SSH - Secure Shell FAQ



Frequently Asked Questions about SSH - Secure Shell.

This FAQ about SSH - Secure Shell was compiled and written by Thomas Koenig Thomas.Koenig@ciw.uni-karlsruhe.de with numerous contributions by others.

-1.1. Where do I get this document? (SSH (Secure Shell) FAQ)
The latest version of this document is available from http://www.uni-...
-2.1. What is ssh?
To quote the README file:...
-2.2. Why should I use it? (SSH (Secure Shell))
The traditional BSD 'r' - commmands (rsh, rlogin, rcp) are ...
-2.3. What kinds of attacks does ssh protect against?
SSH protects against:...
-2.4. What kind of attacks does ssh not protect against?
Ssh will not help you with anything that compromises your host'...
-2.5. How does it work? (SSH (Secure Shell))
For more extensive information, please refer to the README and ...
-3.1. What is the latest version of ssh?
The latest officially released version is is 1.2.20....
-3.2. May I legally run ssh?
The UNIX version of ssh 1.2.20 may be used and distributed freely, ...
-3.3. What about commercial use of ssh?
Ssh has been freely available in the Unix environment, and ...
-3.4. Where can I obtain ssh?
The central site for distributing ssh is ftp://ftp.cs.hut.fi/pub/ssh/....
-3.5. How do I install it? (Obtaining and installing ssh)
Get the file from a site near you, then unpack it ...
-3.6. Does it make sense to install ssh as non-root under UNIX?
You can install and run a ssh binary, which you can use to log ...
-3.7. Where do I get help? (Obtaining and installing ssh)
First of all, read the documentation, this document :-) and the ...
-3.8. Are there any versions for other operating systems than UNIX? (Obtaining and installing ssh)
Heikki Suonsivu (hsu@clinet.fi) and Michael Henits (moi@dio.com) ...
-3.9. What about administration of ssh?
The central problem of administering ssh is the management of ...
-4.1. Can I run backups over ssh?
Yes. Since ssh is a drop-in replacement for rsh, backup scripts ...
-4.2. Should I turn encryption off, for performance reasons? (Ssh Applications)
No; you should keep it turned on, for security reasons....
-4.3. Can I use ssh to communicate across a firewall?
Yes; you can use TCP forwarding for that, by using its secure ...
-4.4. Can I use rdist with ssh?
Stock rdist 6.1.0 does not work together with ssh, due to bugs in it....
-4.5. Can I use ssh to securely connect two subnets across the Inter- net?
You can run PPP over a regular ssh connection. ...
-4.6. Can I use ssh to securely forward UDP-based services, such as NFS or NIS?
There is a general working solution for RPC-based services, such ...
-4.7. Can I forward SGI GL connections over ssh?
It is not likely that this will be implemented. GL uses a ...
-4.8. Can I use ssh to protect services like ftp or POP?
If you want to avoid sending ftp passwords in cleartext over the net,...
-4.9. Can I use ssh across a Socks firewall?
Socks 5 support should work in 1.2.16 or later....
-4.10. Is there ssh support for AFS/Kerberos?
At the moment, not in the main sources. There's an AFS ...
-5. Problems (SSH (Secure Shell))
If you don't find your problem listed below, please submit a ...
-5.1. ssh otherhost xclient & does not work!
No, it doesn't. Use ssh -f otherhost xclient instead, or ssh -...
-5.2. Ssh fails with "Resource temporarily unavailable" for Solaris
For Solaris 2.4, this s a kernel bug. Get the patch 101945-37 to ...
-5.3. Sshd hangs under Solaris 2.5!
This is a problem with the Solaris shared library code, which causes ...
-5.4. X11 forwarding does not work for an SCO binary with the iBCS2 emulator under Linux.
You need to set the hostname to the fully qualified domain name ...
-5.5. Ssh is doing wrong things for multi-homed hosts!
Check whether gethostbyname() really returns the complete lists ...
-5.6. Userid swapping is broken under AIX! (SSH (Secure Shell))
This is a bug in AIX 3.2.5, reported as APAR IX38941, and fixed ...
-5.7. ssh-keygen dumps core on Alpha OSF!
For Alpha OSF/1 1.3.2, this is due to a bug in the vendor-...
-5.8. ssh-keygen dumps core on Solaris or SunOS
This is a bug in gcc 2.7.0, which causes it to generated ...
-5.9. On Linux, compilation aborts with some error message about libc.so.4 (SSH (Secure Shell))
This is an incorrectly configured Linux system; do a cd /usr/lib; ...
-5.10. X authorization sometimes fails. (SSH (Secure Shell))
This is believed to be a bug in HP-UX 9 xauth, SR 5003209619. ...
-5.11. Ssh asks me for passwords despite .rhosts!
There are several possibilities why this could be the case; ...
-5.12. Why does ssh loop with "Secure connection refused'?
This is a configuration problem....
-5.13. ssh-agent does not work with rxvt!
rxvt closes all file descriptors when starting up, including the ...
-5.14. X authorization always fails. (SSH (Secure Shell))
This can happen if the xauth program was not found at configure time....
-5.15. ssh hangs when forwarding multiple TCP connections.
This is due to a known race condition in the ssh protocol ...
-5.16. What does Warning: remote host denied X11 forwarding mean? (SSH (Secure Shell))
Either the remote end has disabled X11 forwarding (ForwardX11 No ...
-5.17. I still see cleartext packages on the net when I run ssh!
It is very likely that you are looking at a telnet, rlogin or ...
-5.18. I have problems with RSAREF, something to do with too many bits! (SSH (Secure Shell))
This is a limitation in the RSAREF library. You should set a host ...
-5.19. Compiling fails with some error messages from the assembler. (SSH (Secure Shell))
For several operating systems there were bugs in the gmp ...
-5.20. Compiling with Solaris 2.5 fails! (SSH (Secure Shell))
Set the CPP environment variable to cc -E -Xs before ...
-5.21. Ssh suddenly drops connections!
This is a problem which has been reported by several people for ...
-5.22. Connections are forwarded as root by ssh!
When a client connects, sshd forks a child that does the ...
-6.1. What known security bugs exist in which versions of ssh?
All versions of ssh prior to 1.2.12.92 had a security flaw ...
-6.2. How widespread is use of ssh?
As with every piece of freely available software, this is difficult ...
-6.3. I don't like the commercial aspects of ssh.
The protocols ssh uses are freely available. There are ...
-6.4. Credits (SSH (Secure Shell))
Most of the credit, of course, goes to Tatu Yloenen for writing ...









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