VERS9203 contains an invalid tag in the entry of node UTORVM: :links4.UTORMVSB(P,1M), RYERSON NRCVM01(P,64K) UOTVM(P,64K) The extra comma after the definition of the UTORMVSB link is not valid and prevents LISTSERV from building its tables. The error message you get is "Error 100 from LSVBGN". Do not install VERS9203 until you receive the VERS9204 update, which is being generated as I type these lines. Eric