Are you sure you configured it properly? should be -ip=188.8.131.52 format of whatever your wan IP is.
Also make sure you dont have another server instance running on same port.
Note that .par file should have been configured as explained in post 86060
Location can be defined with -par=parameterFileName startup parameter. If file extension is .par the formatting described previously is required. With any other extension (like .txt) a plain text is assumed, with one command line option per line. In both cases the file is preprocessed before parsing, allowing C++ style comments and #define-s to be used..par file does not (and will not) support some low level parameters, namely:
The reason is those need to be initialized before any file operations are done.