I think I have found something.... I have several DOS Citrix client (4.3.XXX). They conect to applications fine on Xpe FR3/SP3, with necessary patches. They seem to connect to MPS 3.0 (no patches), they even seem to connect to MPS 3.0 with the rollup package 1 on it. It seems that once I put the MPS 3.0 rollup package 2 onto the server, DOS clients can no longer connect to Citrix applications. Anyone else heard of/seen this? Chad M. Schneider Technology Analyst Bemis Company, Inc. 920-303-7609 "Just because you can, does not mean that you should."