I have the same problem with a DNN 4.09.04 site. Unfortunately, upgrading is not an option at this point and DDR menu is only available for DNN 4.5 and higher. The site already uses compatibility mode, so navigator.userAgent reports as IE9. For the server side, I'm using ISAPI Rewrite to detect IE 11's user agent and rewrite the header such that it _should_ be compatible with any faulty sniffing that Solpart or other DNN modules may be doing. However, it doesn't work. I've verified that the User Agent is being rewritten properly (via log files & a simple ASPX page that prints the user agent)  but still, the menus do not appear. However, if I use IE 11's Developer Tools to change the user agent to IE9, it works fine. I've even hard-coded the rewritten user agent to exactly what IE's Developer Tools send when set to IE9 mode, but still it fails. Anyone have any ideas?

And again, I realize how terrible of a hack this is. It's a necessary stopgap until the time can be devoted to properly upgrading the site.

Thanks.

- Amir

I figured out my problem. My original attempt was to simply add MSIE: 11.0 to the User Agent, since MSIE is typically what browser detection routines look for when identifying IE. As I mentioned, that didn't work, and then I resorted to using a copy-and-paste of an IE9 generated on my Windows 7 VM. The issue there was that the paranthesis were not escaped properly in the regular expression (for ISAPI Rewrite), resulting in the incorrect output. This is the configuration I'm using in httpd.conf, in case it helps anyone else who is in the same boat as me:

RewriteEngine on
RewriteLogLevel 9 # disable when satisfied it's working
LogLevel debug # same

# The following will rewrite the User-Agent header to a hardcoded IE9 one, IIF
# a) the User Agent DOES NOT contain MSIE
# b) the User Agent DOES contain Trident
# which should be sufficient in only catching IE 11

RewriteCond %{HTTP_USER_AGENT} !msie [NC]
RewriteHeader User-Agent: ^(.+)(trident.+)$ Mozilla/5.0\ \(compatible;\ MSIE\ 9.0;\ Windows\ NT\ 6.1;\ Trident/5.0\) [NC]

(note that spaces and parenthesis must be escaped in the substitution string)

Note: it'd be better if the User Agent wasn't completely hard-coded, but instead just was tweaked enough to fool the necessary modules. It seems that whatever routine is being used to parse the user agent is pretty tightly coupled to this format, so just adding MSIE: 11.0; before the trident version isn't sufficient.

- Amir