Recently, I found that some searches in Firefox are redirected to Bing. (Instead of my primary search engine Google.)
I am not sure, but it seems that it is not bound to search but rather a hostname resolving. Since entering a single word that might be a hostname redirects to Bing. But entering more words searches using my primary search engine.
hey -> uses Bing to search
hey hey -> uses Google to search
I found that the resulting search url contains MSSRPD:
http://www.bing.com/search?q=hey&form=MSSRPD
I am wondering what is the MSSRPD and how can I uninstall/disable it, so my primary search engine is used?
EDIT: I have no directory C:\Program Files\Microsoft\Search Enhancement Pack\Search Helper\ on my computer.
EDIT2: Same problem in Safari.
I found the answer: In case you have the same problem, go to registry: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\TCPIP\Parameters and empty the mshome.net value from the ICSDomain key, then disable and re-enable your network adapter.
UPDATE: After few days, it stopped working again. I've found that IPv6 DNS is also redirecting to Bing. I don't know, where Windows get the IPv6 DNS since my DHCP server is not providing that and I have not set up that. So, I've disabled IPv6 for now and it works.