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After migration of a CMS4 site we started to get a lot of reports of links that had stopped working.
I remembered that we had trouble with non allowed characters in an other site some time ago.
A quick check and sure enough we had a problem with “&” characters in some of the folder names.
In CMS 6 a validation has been added to avoid these problems but not in a default CMS 5 R2site.
Luckily there is an easy fix. Replacing the standard
<virtualPath customFileSummary="~/FileSummary.config" /> row in web.config with the below adds the validation.
<virtualPath customFileSummary="~/FileSummary.config" illegalCharactersRegex="%|&|\+|/COM[0-9]([/\.]|$)|/LPT[0-9]([/\.]|$)|/PRN([/\.]|$)|/CLOCK\$([/\.]|$)|/AUX([/\.]|$)|/NUL([/\.]|$)|/CON([/\.]|$)|/.+\.$" illegalCharactersDisplayString="%,&,+,COM,LPT,PRN,CLOCK$,AUX,CON,NUL,*.">
I don’t understand why this functionality isn’t activated by default in CMS5 and a recommendation to anyone upgrading a pre CMS5 site is to go through all the folders and correct any incorrect folder names.