...but 2.4.3 worked fine. this is linux 2.4.18 with glibc 2.2.5 and libz 1.1.4, if it matters, on both source and dest. apparently something about trying to send a file ending with .iso gives rsync a fit if the -z [compress] option is used. $ time rsync -Pzv --stats cd1_en_binary.iso mail.cheek.com::root/home/ericom Password: cd1_en_binary.iso rsync: error writing 16385 unbuffered bytes - exiting: Connection reset by peer rsync error: error in rsync protocol data stream (code 12) at io.c(463) Command exited with non-zero status 12 0.30user 0.50system 0:39.23elapsed 2%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (254major+648minor)pagefaults 0swaps if no -z, things go fine: $ time rsync -Pv --stats cd1_en_binary.iso mail.cheek.com::root/home/ericom Password: cd1_en_binary.iso 616431616 100% 190.94kB/s 0:52:32 rsync[8871] (sender) heap statistics: arena: 70552 (bytes from sbrk) ordblks: 3 (chunks not in use) smblks: 0 hblks: 1 (chunks from mmap) hblkhd: 266240 (bytes from mmap) usmblks: 0 fsmblks: 0 uordblks: 58120 (bytes used) fordblks: 12432 (bytes free) keepcost: 8112 (bytes in releasable chunk) Number of files: 1 Number of files transferred: 1 Total file size: 616431616 bytes Total transferred file size: 616431616 bytes Literal data: 85710848 bytes Matched data: 530720768 bytes File list size: 36 Total bytes written: 85851105 Total bytes read: 197935 wrote 85851105 bytes read 197935 bytes 25499.79 bytes/sec total size is 616431616 speedup is 7.16 76.71user 11.40system 56:13.93elapsed 2%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (243major+599minor)pagefaults 0swaps this has been verified on two different send/receive host combinations, using both 2.5.0 and 2.5.5, whether or not *.iso was listed in the "dont compress" section of rsyncd.conf. renaming both source and dest files to *.is0 [zero] seems to work fine; i can sync *.is0 files just fine with -z [and it produces quite a speedup too vs. no compression!]. btw, thanks tridge and folks for such a handy util. joe -- Joseph Cheek, CTO and Founder, Lycoris Lycoris Desktop/LX: Familiar. Powerful. Open. joseph@lycoris.com, http://www.lycoris.com/ +1 425 413-9521 voice, +1 425 671-0504 fax