mod_jk.log messages

I asked this last week and did not receive a reply, but I am unable to find documentation on these errors. Can anyone help? [jk_ajp13_worker.c (325)]: Error ajp13_process_callback - write failed [jk_ajp13_worker.c (325)]: Error ajp13_process_callback - write failed [jk_ajp13_worker.c (325)]:

ajp13 error

What does this error message mean and what can cause it? [jk_ajp13_worker.c (325)]: Error ajp13_process_callback - write failed I'm getting quite a few on my sites and our sites are also exhibiting weird/slow behavior so I'm trying to put the two together... Thanks, Fran