Python Pexpect - SSH Timeout

[Nirmal]

Hi

I am using Pexpect module to make SSH connection but it is falling into Traceback and exits.
Any idea how to fix it .

I have tried multiple post that already exist in StackOverflow and other
forums but end up with no luck.

Traceback:

 <class 'pexpect.TIMEOUT'>
    Traceback (most recent call last):
      File "nirmal.hostlist.py", line 610, in <module>
        main()
      File "nirmal.hostlist.py", line 581, in main
        dataGrabber(ls5,ls5_leafs,username,password,enable_pass,ls5_cat_leafs,no_cat,no_l3_fw)
      File "nirmal.hostlist.py", line 428, in dataGrabber
        macs = macGrabber(child,switch)
      File "nirmal.hostlist.py", line 32, in macGrabber
        child.expect('.#')
      File "/usr/lib/python2.6/site-packages/pexpect.py", line 1311, in expect
        return self.expect_list(compiled_pattern_list, timeout, searchwindowsize)
      File "/usr/lib/python2.6/site-packages/pexpect.py", line 1325, in expect_list
        return self.expect_loop(searcher_re(pattern_list), timeout, searchwindowsize)
      File "/usr/lib/python2.6/site-packages/pexpect.py", line 1409, in expect_loop
        raise TIMEOUT (str(e) + '\n' + str(self))
    pexpect.TIMEOUT: Timeout exceeded in read_nonblocking().
    <pexpect.spawn object at 0xc6af90>
    version: 2.3 ($Revision: 399 $)
    command: /usr/bin/ssh
    args: ['/usr/bin/ssh', 'ng044806@ls5mm33-ci-red']
    searcher: searcher_re:
        0: re.compile(".#")
    buffer (last 100 chars):
    before (last 100 chars):
    after: <class 'pexpect.TIMEOUT'>
    match: None
    match_index: None
    exitstatus: None
    flag_eof: False
    pid: 56774
    child_fd: 3
    closed: False
    timeout: 30
    delimiter: <class 'pexpect.EOF'>
    logfile: None
    logfile_read: None
    logfile_send: None
    maxread: 2000
    ignorecase: False
    searchwindowsize: None
    delaybeforesend: 0.05
    delayafterclose: 0.1
    delayafterterminate: 0.1

My code:

def ssh(hostname,username = 'nadda',password = 'nadda',enable_pass='nadda',cat = False):
        hostname = hostname.lower()
        pass_prompt = re.compile('.*assword:')
        need_key = re.compile('\s.*Are you sure you want to continue connecting \(yes\/no\)\?.',re.DOTALL)
        denied = re.compile('Permission denied, please try again\.')
        refused = re.compile('Connection refused by remote host')
        reset = re.compile('Connection reset by peer')
        count = 0
    
        if username is 'nadda' and password is 'nadda':
            username = raw_input('login as: ')
            password = getpass.getpass('Password:')
        print "connecting to " + hostname
        if cat is True:
            print ('ssh -t root@mgmtsrver "ssh %s@%s"' % (username,hostname))
            child = pexpect.spawn('ssh -t root@mgmtsrver "ssh %s@%s"' % (username,hostname))
            #ssh -t root@mgmtsrver "ssh bs04628@fs-it-sw-blue"
        else:
            child = pexpect.spawn('ssh ' + username + '@' + hostname)
        print 'connected to ' + hostname
        i = child.expect([need_key,'.*>',pass_prompt,pexpect.TIMEOUT,denied,refused,reset])
        if i==0:
            child.sendline('yes')
            print 'adding ssh key'
            child.expect(pass_prompt)
        else:
            print 'not adding ssh key'
    
        if i == 1 or cat is True:
            child.sendline(password)
            child.expect('.*>')
            child = enable(child,enable_pass)
        elif i == 2:
            if '-fw-' in hostname:
                child.sendline(enable_pass)
                child.expect('.*>')
                child = enable(child,enable_pass)
            else:
                child.sendline(password)
                child.sendline('term length 0')
                child.expect('.*#')
        elif i == 3:
            print 'SSH TIMED OUT ON ' + hostname
            exit()
        elif i == 4:
            print 'PERMISSION DENIED ON %s. Try re-running script with proper creds' % hostname
            child.close()
            exit()
        elif (i == 5 or i == 6) and count == 0:
            print 'CONNECTION REFUSED ON %s' % hostname
            print 'Will try to reconnect once in 5 seconds...'
            time.sleep(5)
            while count < 1:
                ssh(hostname,username,password,enable_pass)
                count += 1
        elif (i == 5 or i == 6) and count > 0:
            print 'Sorry, %s refused your connection more than once. ' \
                  'You\'ll have to re-run this script for %s' % (hostname, hostname[:3])
            exit()
        print '\n'
        return child,username,password