rfc tcp/ip error

hi

For my rfc to file cenario tcp/ip is giving following error.

Error Details hostname 'mtesap01' unknown / CPIC-CALL: 'ThSAPOCMINIT' Unable to determine hos

Error Details LOCATION: SAP-Server mtecsap01_IDS_00 on host mtecsap01 (wp 4)

Error Details DETAIL: NiPGetHostByName: hostname 'mtesap01' not found

Error Details ERROR NUMBER: 11004

Error Details ERROR TEXT: WSANO_DATA: Valid name, no data record of requested type

Error Details MODULE: ninti.c Error Details LINE: 320 Error Details RETURN CODE: -2

plz help me.