Recently I've started having problems starting my DataMiner, some further investigation showed that SLNet was unable to start because a different process was already listening on TCP port 8004 (used for .NET Remoting in DataMiner). Using the netstat command I found the Windows IP Helper Service (iphlpsvc) was listening on port 8004. Stopping the service iphlpsvc allowed my DMA to start again.
I wonder if anyone has seen similar issues caused by the IP Helper Service and if they are related to Windows updates or some kind of configuration change on my machine?
After some further investigation, I found the IP Helper service was often taking up ports used by other applications (NATS, IIS, SLNet,...). This caused many issues for said apps as they could not listen on their dedicated ports. The IP Helper service is a non-critical Windows Service so for me, the solution was to disable the service in the Windows Service Manager.
It was likely automatically enabled after I configured a proxy on my computer.