In SiteScope (SiS) the Log Monitor using "server-side processing" could throw the error message:
ERROR – Error during log parsing: iconv: illegal input sequence at position
The "server-side processing" feature converts the monitored log/text file on the LINUX system.
The used command is iconv – Convert encoding of given files from one encoding to another.
The error message is from the command because the chosen file encoding in the monitor settings does not correspond to the real file encoding.
A different file encoding should be selected, till the error disappears.