Hi,

One of my clients is running a DNN  5.2.1 website (soon to be upgraded to 5.3.1).  They have mentioned that "tracing is enabled for their website" and that "over 90 Gigs of .axd files have been transferred to clients" over the last few months.

What exactly are .axd files - and does anyone have any idea why such a huge amount (over 90 gigs) of these files could possibly have been transferred to the client browser?

Thanks in advance.

.axd is just a reserved extension for asp.net.  They might create tracing files, but they are also used to download things like system-generates ajax javascript files, plus many other things.  Because of their dynamic nature (different for each request, page in some cases) they are generally not cached anywhere (server or browser) so are continually downloaded.

It is incorrect to get the total amount of .axd files transferred and conclude it is all from tracing.    It's not at all unusual for a standard DNN page request to generate 20k in scriptResource.axd and another 20k in webResource.axd calls per request.