PuTTY failing "Server's host key did not match the signature supplied" suddenly

Dear All,

PuTTY suddenly fails to connect to my server reporting "Server's host
key did not match the signature supplied".

Configuration as follows:

PuTTY Version: Release 0.60

Server: CentOS release 5 (Final) with openssh-server-4.3p2-24.el5
openssh-4.3p2-24.el5

Tried connecting with ssh client and ssh reports:
"hash mismatch
key_verify failed for server_host_key"

or

"RSA_public_decrypt failed: error:0407006A:rsa
routines:RSA_padding_check_PKCS1_type_1:block type is not 01
key_verify failed for server_host_key"

Have anyone encountered this problem before?

Connection to other server is ok.

Regards,

Raymond Pau
.

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