Linux – mongod service not starting

I've installed mongodb in Debian Squeeze using this guide (guide here)
Installed successfully.

It was running well until I restarted the machine (using command "reboot");

After restart, mongodb is not able to initiate correctly.

Log file (/var/log/mongodb/mongod.log):

(...)
2014-07-03T16:43:45.350+0000 [initandlisten] options: { config: "/etc/mongod.conf", net: { bindIp: "127.0.0.1" }, storage: { dbPath: "/var/lib/mongodb" }, systemLog: { destination: "file", logAppend: true, path: "/var/log/mongodb/mongod.log" } }
2014-07-03T16:43:45.423+0000 [initandlisten] ERROR: listen(): bind() failed errno:99 Cannot assign requested address for socket: 127.0.0.1:27017
2014-07-03T16:43:45.445+0000 [initandlisten] now exiting
2014-07-03T16:43:45.445+0000 [initandlisten] dbexit:
(...)

I've tried this but It didn't help.

Also tried

/etc/init.d/mongod stop/start/restart

And got:

root@Whatever:~# /etc/init.d/mongod stop
Stopping database: mongod apparently not running.
root@Whatever:~# /etc/init.d/mongod start
Starting database: mongod failed!
root@Whatever:~# /etc/init.d/mongod restart
Restarting database: mongod failed!

EDIT:
/etc/mongo.conf:

# mongod.conf

# Where to store the data.

# Note: if you run mongodb as a non-root user (recommended) you may
# need to create and set permissions for this directory manually,
# e.g., if the parent directory isn't mutable by the mongodb user.
dbpath=/var/lib/mongodb

#where to log
logpath=/var/log/mongodb/mongod.log

logappend=true

#port = 27017

# Listen to local interface only. Comment out to listen on all interfaces.
bind_ip = 127.0.0.1

# Disables write-ahead journaling
# nojournal = true

# Enables periodic logging of CPU utilization and I/O wait
#cpu = true

# Turn on/off security.  Off is currently the default
#noauth = true
#auth = true

# Verbose logging output.
#verbose = true

# Inspect all client data for validity on receipt (useful for
# developing drivers)
#objcheck = true

# Enable db quota management
#quota = true

# Set oplogging level where n is
#   0=off (default)
#   1=W
#   2=R
#   3=both
#   7=W+some reads
#diaglog = 0

# Ignore query hints
#nohints = true

# Disable the HTTP interface (Defaults to localhost:28017).
#nohttpinterface = true

# Turns off server-side scripting.  This will result in greatly limited
# functionality
#noscripting = true

# Turns off table scans.  Any query that would do a table scan fails.
#notablescan = true

# Disable data file preallocation.
#noprealloc = true

# Specify .ns file size for new databases.
# nssize = <size>

# Replication Options

# in replicated mongo databases, specify the replica set name here
#replSet=setname
# maximum size in megabytes for replication operation log
#oplogSize=1024
# path to a key file storing authentication info for connections
# between replica set members
#keyFile=/path/to/keyfile