Customer is getting the following error in Apache Error Logs and wants to know the possible causes for this error-
[mod_sm.cpp:1070][ERROR] Error in input filter 'SMINPUTFILTER' - 'An existing connection was forcibly closed by the remote host. '
[SmApache20WebFilterCtxt.cpp:460][ERROR] Input filter pre-fetch read error - 'An existing connection was forcibly closed by the remote host. '
The SMFILTER is web agent terminology for the web server specific shim that interfaces with the web server and uses the specific API provided by the web server. The message indicates that the failure is there and not in the "common" agent code.
The error is caused by the apache server being unable to return the data the web agent is expecting from the apache API call. This could happen from calls that are used to read all the data from a chunked encoded post.
The most likely reason for the failure and the message is that a browser was closed before the posted chunk encoded data has completed uploading to the web server. A network problem or error could also produce the same error.