Can someone help me why do I get this error

Could not connect to TraCI server at localhost:58681 [Errno 111] Connection
refused
 Retrying in 1 seconds
Loading configuration... Loading configuration... done.
Loading net-file from 'net.net.xml'... done.
***Starting server on port 58681 ***
done (8ms).
Loading additional-files from 'wsn.add.xml'... done (0ms).
Loading additional-files from 'sensor.add.xml'... done (0ms).
Loading done.
Simulation started with time: 0.00
Warning: Environment variable SUMO_HOME is not set, schema resolution will
use slow website lookups.
Error: unable to resolve host/address 'sumo.dlr.de'
 In file 'dua.rou.xml'
 At line/column 1/0.

Quitting (on error).
Loading net-file from 'net.net.xml'... done (6ms).
Loading additional-files from 'wsn.add.xml'... done (1ms).
Loading additional-files from 'sensor.add.xml'... done (3ms).
Loading done.
Simulation started with time: 0.00
Warning: Environment variable SUMO_HOME is not set, schema resolution will
use slow website lookups.
Error: unable to resolve host/address 'sumo.dlr.de'
 In file 'dua.rou.xml'
 At line/column 1/0.

Quitting (on error).
Traceback (most recent call last):
  File "baseline1.py", line 35, in <module>
    traci.start(sumoCmd)
  File "/home/aish/paperwork/atlc_wsn/traci/__init__.py", line 88, in start
    return getVersion()
  File "/home/aish/paperwork/atlc_wsn/traci/__init__.py", line 146, in
getVersion
    return _connections[""].getVersion()
  File "/home/aish/paperwork/atlc_wsn/traci/connection.py", line 294, in
getVersion
    result = self._sendExact()
  File "/home/aish/paperwork/atlc_wsn/traci/connection.py", line 102, in
_sendExact
    raise FatalTraCIError("connection closed by SUMO")
traci.exceptions.FatalTraCIError: connection closed by SUMO




I dont know why it uses that port number
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