Certificate error.

[Grant]

[root at test2 /tmp]# smbclient \\\\test/etc
added interface ip=192.168.1.5 bcast=192.168.1.255 nmask=255.255.255.0
Got a positive name query response from 127.0.0.1 ( 192.168.1.5 )
SSL: Cert error: unknown error 18 in
/C=AU/ST=Queensland/L=Brisbane/O=Test Company/OU=Unknown
/CN=www.conprojan.com.au/Email=info at conprojan.com.au
SSL: negotiated cipher: DES-CBC3-SHA
Password:
Anonymous login successful
Domain=[TEST] OS=[Unix] Server=[Samba 2.0.7]
smb: \>

Does anyone know what could be wrong? What is unknown error 18 exactly?

Thanks.