Check the "Add/Remove Programs" control panel on the user's computer for a program called "CommonName", or something similar. I have seen similar problem reports which were attributed to this piece of software. At least one manufacturer may be installing it on new computers, and it is also bundled with several popular "free" software downloads. -- Paul Russell Senior Systems Administrator O&E Messaging Services Team University of Notre Dame >> >> This first appeared a month or so ago when I was showing a new >> owner how to use the web interface (we're still on 1.8d, IIS4). >> We tried using her MS IE browser but the URL for >> http://listserv.nodak.edu/scripts/wa.exe?LMGT1 >> was rejected with an "invalid parameter" error. I noticed in the >> "Address:" field that the LMGT1 had been changed to lower case! >