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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