Microsoft Exchange – IIS – Data at the root level is invalid

exchange

Hi,

Strange thing this morning, IIS on Exchange server talks about ‘data at root level is invalid’. Also saw some errors looking like below. (was a bit different)

iis-error

Looks like the file in question gets corrupted or is overwritten with faulty or incomplete data, screwing up the XML formatting. I replaced the ‘applicationHost.config’ file with a copy form a other, still functional, exchange server. Rebooted the server, and IIS is again serving Exchange Virtual Directory’s.

Think this error is caused due to lack of memmory.

In this case the customer running exchange has very few resources assigned to the VM, the absolute minimum. Besides that, the pagefile is relativly small (to small). 1GB. This is also impacting exchange. I’ve changed the pagfile to be greated then the ‘minimum needed for exchange’ + 1GB. Exchange now runs stable. (performance is stil crap.. due to resources).