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Tuesday, August 28, 2012

Receiving 'Access Denied' just after typing the username in Putty

Problem: Getting 'Access Denied' just after typing username in putty.

Information: The above problem occurs because of the failure of GSSAPI authentication.

What is GSSAPI?  
Generic Security Services Application Program Interface(GSSAPI) is a ITEF standard for doing strong encrypted authentication in network based applications. OPENssh uses this API and the underlying kerberos 5 code to provide a alternative means of authentication other than ssh_keys.
The GSSAPI, by itself, does not provide any security. Instead, security service vendors provide GSSAPI implementations usually in the form of libraries installed with their security software.

Solution:

1. Open Putty.
2. Go to Connection->SSH->Auth->GSSAPI.
3. Uncheck the "Attempt GSSAPI authentication(SSH2-only)" option.
4. Save the session.

Putty: Access Denied Problem




Note: PuTTY 0.62 fixed the bug where failing GSSAPI authentication caused this error message.

References: