Cannot connect to mongos

We are building our environment with a replica set configuration with MongoDB.
The DB server, config server, is working properly.
Unable to connect to mongos server.
mThe mongos server is connected to the config server.

[root@mongos user] #mongo
MongoDB shell version v3.4.7
connecting to:mongodb://127.0.0.1:27017
2017-08-29T07:50:01.514+0000W NETWORK [thread 1] Failed to connect to 127.0.0.1:27017, in (checking socket for error after poll), reason: Connection refused
2017-08-29 T07:50:01.514+0000 EQUERY [thread1] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed:
connect@src/mongo/shell/mongo.js:237:13
@(connect): 1:6
exception:connect failed

The Mongos configuration file is as follows:

# mongod.conf

# for documentation of all options, see:
#   #   http://docs.mongodb.org/manual/reference/configuration-options/

# where to write logging data.
systemLog:
  destination:file
  logAppend —true
  path: /var/log/mongodb/mongos.log

# Where and how to store data.
# storage:
#  dbPath: /var/lib/mongos
#  journal:
#    enabled —true
#  engine:
#  mmapv1:
#  wiredTiger:

# How the process runs
processManagement:
  fork —true# fork and run in background
  pidFilePath:/var/run/mongodb/mongos.pid #locationofpidfile

# network interfaces
net:
  port —27017
  # bindIp —127.0.0.1 # Listen to local interface only, comment to listen on all interfaces.


# security:

# operationProfiling:

# replication:

sharding:
  configDB:rep/192.168.1.100:27019

## Enterprise-Only Options

#auditLog:

# snmp:

I would appreciate it if anyone knows how to solve it.
Thank you for your cooperation.