WCF gives error 10061 after starting the service with another username - wcf

Question

I have a service running for over a year on a dedicated windows server.
On my client computer I have a winforms client that communicates with this service using WCF
This works without problems for more than a year now.
But now company policy has changed and I had to start the service with another account than the domain\administrator account.
The account that is used is also a domain account and it does has administrator rights.
But since this my winforms client cannot connect to it anymore, I always get this error :
---------------------------
Could not connect to net.tcp://localhost:8001/CommunicationService.
The connection attempt lasted for a time span of 00:00:02.0176000.
TCP error code 10061: No connection could be made because the target machine actively refused it 127.0.0.1:8001.
---------------------------
So I guess I need to do give some rights to something but I have no clue here.
Can someone explain what I need to do to get this working again ?
Remember that both the service and the client are NOT changed in any way, and it worked perfect until I had to start the service with another user account.
So it should not be a firewall issue I think nor any bug in my code.
EDIT:
this is the config file of the service:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<system.serviceModel>
<services>
<service name="CommunicationService" behaviorConfiguration="debug">
<endpoint address="net.tcp://localhost:8001/CommunicationService" binding="netTcpBinding" contract="ICommunication"/>
</service>
</services>
<bindings>
<netTcpBinding>
<binding>
<security mode="None"></security>
</binding>
</netTcpBinding>
</bindings>
<behaviors>
<serviceBehaviors>
<behavior name="debug">
<serviceDebug includeExceptionDetailInFaults="true" />
</behavior>
</serviceBehaviors>
</behaviors>
</system.serviceModel>
</configuration>
and this is the config of my client:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<system.serviceModel>
<client>
<endpoint address="net.tcp://192.0.137.198:8001/CommunicationService" binding="netTcpBinding" contract="ICommunication"/>
</client>
<bindings>
<netTcpBinding>
<binding sendTimeout="00:00:05">
<security mode="None"></security>
</binding>
</netTcpBinding>
</bindings>
</system.serviceModel>
</configuration>
EDIT:
If I run the client on the same computer as the service than it works.
I tried with this
netsh http add urlacl url=http://127.0.0.1:8001/MyUri user=domain\user
but no help here. I found this command here HTTP could not register URL http://+:8000/HelloWCF/. Your process does not have access rights to this namespace but I have no clue what parameters I need to use for it

Answer 1

got it working.
It seems I had the wrong config file for the client, its endpoint was set to 127.0.0.1 in stead of pointing to the correct service.