Verify that TCPIP is active, that another program is not using NCPROUTE's port, that the well-known port has been reserved in the PORT statement of hlq.PROFILE.TCPIP data set, and that the user-defined port has been specified in hlq.ETC.SERVICES data set. Correct the problem as indicated by the error in the detailed tcperror() library message. See the z/OS XL C/C++ Runtime Library Reference for more information about socket() function errors.