Error in http test

I'm having a lot of problems with the connection between the server (which in on my workstation) and the client.

Start tests for host localhost, port 18888

IP address is 127.0.0.1

Ping result = Success

Ping round trip time was 0 msecs

Test connection to

http://localhost:18888/

...

Error in http test:

Value does not fall within the expected range.

Tests failed

Start tests for host localhost, port 18888

IP address is 127.0.0.1

Ping result = Success

Ping round trip time was 0 msecs

Test connection to http://localhost:18888/

...

Error in http test:

Value does not fall within the expected range.

Tests failed