The sasvtcp appendage is a 96020 byte binary file. It replaces the $SASROOT/sasexe/base/sasvtcp binary (It is recommended the original sasvtcp appendage be saved). Use chmod and chown as necessary so the replacement file's mode and ownership matches the original. What the patch is about: SAS 6.10 and SAS 6.11 for Intel ABI+ contain a dependency on the library "/usr/lib/libsocket.so" which has worked well until now (and was essential for certain older operating systems) but the Intel ABI+ now specifies "libsocket.so.1". Changes in PTX 4.4.1 cause SAS to get the wrong socket library. The patched sasvtcp was altered to depend on libsocket.so.1 However there are other binaries in the SAS distribution that still have a dependency on /usr/lib/libsocket.so If those binaries cannot load, or malfunction, they also may need to be patched. Be aware of this possibility. If other problems do arise, please contact Technical Support at (919)677-8008.