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We recommend enabling them SSH COM uses cookies to give you the best experience and most relevant marketing.. This can easily happen if you are using Pageant and have a large number of keys loaded into it, since these servers count each offer of a public key as an authentication attempt.. 4 The first cipher supported by the server is If you get an error message which is not listed in this chapter and which you dont understand, report it to us as a bug (see appendix B ) and we will add documentation for it.. 3 SSH protocol version 2 required by our configuration but server only provides (old, insecure) SSH-1 10.. 22 8 ); PuTTY will ignore any other keys Pageant may have, but will ask Pageant to do the authentication, so that you dont have to type your passphrase.. The servers host key is not cached in the registry This error message occurs when PuTTY connects to a new SSH server.. By default, PuTTY puts up this warning only for single-DES and Arcfour encryption.. Putty 10 11 Manuals PuTTY UserPutty 10 11 Manuals PuTTY UserMore info DECLINE Warning: Some functionality on this site will not work without cookies and our advertising will be less relevant GOT IT Home SSH PuTTY putty-manuals PuTTY User Manual (putty-0.. You might start seeing this message with new versions of PuTTY (from 0 68 onwards) where you didnt before, because it used to be possible to configure PuTTY to automatically fall back from SSH-2 to SSH-1.. SSH protocols 1 and 2 use separate host keys, so when you first use SSH-2 with a server you have only used SSH-1 with before, you will see this message again.. If you see this message and you know that your installation of PuTTY has connected to the same server before, it may have been recently upgraded to SSH protocol version 2.. On the other hand, it may simply mean that the administrator of your server has accidentally changed the key while upgrading the SSH software; this shouldnt happen but it is unfortunately possible.. Every server identifies itself by means of a host key; once PuTTY knows the host key for a server, it will be able to detect if a malicious attacker redirects your connection to another machine.. 18 4 ), or use the -1 command-line option; in any case, you should not treat the resulting connection as secure.. If the server genuinely only supports SSH-1, then you need to either change the SSH protocol version setting (see section 4.. If so, verify the new host key in the same way as you would if it was new If you see this message, the server youre trying to connect to only supports the older SSH-1 protocol.. If you see this message, it means that PuTTY has not seen this host key before, and has no way of knowing whether it is correct or not.. This is no longer supported, to prevent the possibility of a downgrade attack The first cipher supported by the server is.. 1 The servers host key is not cached in the registry 10 2 WARNING - POTENTIAL SECURITY BREACH 10.. This may happen for genuine reasons: if the computer really has run out of memory, or if you have configured an extremely large number of lines of scrollback in your terminal.. See section 4 21 for more information on this message Server sent disconnect message type 2 (protocol error): Too many authentication failures for root This message is produced by an OpenSSH (or Sun SSH) server if it receives more failed authentication attempts than it is willing to tolerate.. You should attempt to verify the host key by other means, such as asking the machines administrator.. This may mean that a malicious attacker has replaced your server with a different one, or has redirected your network connection to their own machine.. See section 2 2 for more information on host keys WARNING - POTENTIAL SECURITY BREACH This message, followed by The servers host key does not match the one PuTTY has cached in the registry, means that PuTTY has connected to the SSH server before, knows what its host key should be, but has found a different one.. This can be worked around by specifying the key thats required for the authentication in the PuTTY configuration (see section 4.. Out of memory This occurs when PuTTY tries to allocate more memory than the system can give it.. On the server, this can be worked around by disabling public-key authentication or (for Sun SSH only) by increasing MaxAuthTries in sshdconfig.. 68-manual) Chapter 10: Common error messages Previous Contents Index Next Chapter 10: Common error messages 10.. You should contact your servers administrator and see whether they expect the host key to have changed.
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