Thanks for the reply. I've replaced the call to read_very_eager() with read_until() and enabled debugging messages. My script now looks like this...
############################# import telnetlib tn = telnetlib.Telnet('192.168.100.11') tn.set_debuglevel(9) tn.read_until('login: ', 5) tn.write('user\n') tn.read_until('Password: ', 5) tn.write('password\n') tn.read_until('bash-2.05$ ', 5) tn.write('ls\n') print tn.read_until('bash-2.05$ ', 5) ############################# Each call to read_until() returns a valid string except for the second one, i.e., tn.read_until('Password: ', 5) returns a null string. Here's the program output with debugging enabled... ############################# Telnet(192.168.100.11,23): recv "\xff\xfd\x18\xff\xfd \xff\xfd#\xff\xfd'" Telnet(192.168.100.11,23): IAC DO 24 Telnet(192.168.100.11,23): IAC DO 32 Telnet(192.168.100.11,23): IAC DO 35 Telnet(192.168.100.11,23): IAC DO 39 Telnet(192.168.100.11,23): recv '\xff\xfb\x03\xff\xfd\x01\xff\xfd\x1f\xff\xfb\x05\xff\xfd!' Telnet(192.168.100.11,23): IAC WILL 3 Telnet(192.168.100.11,23): IAC DO 1 Telnet(192.168.100.11,23): IAC DO 31 Telnet(192.168.100.11,23): IAC WILL 5 Telnet(192.168.100.11,23): IAC DO 33 Telnet(192.168.100.11,23): recv '\xff\xfb\x03' Telnet(192.168.100.11,23): IAC WILL 3 Telnet(192.168.100.11,23): recv '\xff\xfb\x01Embedded Systems, 2050 Single Board Computer.\r\nR' Telnet(192.168.100.11,23): IAC WILL 1 Telnet(192.168.100.11,23): recv 'uning \\s Kernel \\r.\r\nEmbedded: 2050 Special Feature' Telnet(192.168.100.11,23): recv 's Enabled.\r\n\r\n' Telnet(192.168.100.11,23): recv 'login: ' Telnet(192.168.100.11,23): send 'user\n' Telnet(192.168.100.11,23): send 'password\n' Telnet(192.168.100.11,23): recv 'Password: ' Telnet(192.168.100.11,23): send 'ls\n' Telnet(192.168.100.11,23): recv '\r\n' Telnet(192.168.100.11,23): recv 'Login incorrect\r\n\r\nlogin: ' Login incorrect login: ############################# It looks like it's sending the password before receiving the password prompt. Any ideas? -- http://mail.python.org/mailman/listinfo/python-list