Invalid URI: The hostname could not be parsed

Hi, I am new to Octopus Deploy.

I have setup an Octopus Server who is listening on port 7001 (since I have allready another app listening on port 80).

I try to register a tentacle client with tentacle.exe. I use this option:

Tentacle.exe register-with --instance “Tentacle” --server “http://MYHOST.DOMAIN.COM:7001

Octopus Deploy: Tentacle version 3.5.1 (3.5.1+Branch.master.Sha.4feefbec21f18bc1
b1908b5721dd03570fec86a6)

Then I get this message:
+++++++++++++++++++++++++++snip+++++++++++++++++++++++++++++++
2016-11-13 12:00:19.8777 1 ERROR ===============================================================================
2016-11-13 12:00:19.8917 1 FATAL Invalid URI: The hostname could not be parsed.
System.UriFormatException: Invalid URI: The hostname could not be parsed.
at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind)
at Octopus.Tentacle.Commands.RegisterMachineCommand.d__18.MoveNext() in Z:\BuildAgent\work\cd33152532ae115f\source\Octopus.Tentacle\Commands\RegisterMachineCommand.cs:line 87
— End of stack trace from previous location where exception was thrown —
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Octopus.Tentacle.Commands.RegisterMachineCommand.Start() in Z:\BuildAgent\work\cd33152532ae115f\source\Octopus.Tentacle\Commands\RegisterMachineCommand.cs:line 67
at Octopus.Shared.Startup.AbstractCommand.Octopus.Shared.Startup.ICommand.Start(String[] commandLineArguments, ICommandRuntime commandRuntime, OptionSet commonOptions) in Z:\BuildAgent\work\cd33152532ae115f\source\Octopus.Shared\Startup\AbstractCommand.cs:line 61
at Octopus.Shared.Startup.OctopusProgram.Start(ICommandRuntime commandRuntime) in Z:\BuildAgent\work\cd33152532ae115f\source\Octopus.Shared\Startup\OctopusProgram.cs:line 231
at Octopus.Shared.Startup.ConsoleHost.Run(Action`1 start, Action shutdown) in Z:\BuildAgent\work\cd33152532ae115f\source\Octopus.Shared\Startup\ConsoleHost.cs:line 77
at Octopus.Shared.Startup.OctopusProgram.Run() in Z:\BuildAgent\work\cd33152532ae115f\source\Octopus.Shared\Startup\OctopusProgram.cs:line 116
+++++++++++++++++++++++++++snap+++++++++++++++++++++++++++++++

I can reach the server ui via the browser also from the machine where I want to install tantacle. The network seems to be ok.

Am I doing something wrong?

Thanks in advance.
Klaus

Sorry, I must be crazy; just realized that I had a mistake in my params. Now, the uri can be parsed. Now I am trying to figure out the port config.