ColdFusion 9, Caching, IP_ADD_MEMBERSHIP Error

I ran into a truly weird error today. I was building a very simple test script to load up my cache system with a lot of crap. This was the script I used:

<cfloop index="x" from="1" to="3000"> <cfset id = "cache_#x#"> <cfset cached = cacheGet(id)> <cfif isNull(cached)> <cfset value = createUUID() & createUUID() & createUUID() & repeatString("foo", 250)> <cfset cachePut(id, value)> </cfif> </cfloop>

Nothing crazy there, right? Well upon running this code I immediately got:

IP_ADD_MEMBERSHIP failed (out of hardware filters?)
net.sf.ehcache.CacheException: IP_ADD_MEMBERSHIP failed (out of hardware filters?)
at net.sf.ehcache.CacheManager.init(
at net.sf.ehcache.CacheManager.(

I googled - and ran across a few things, but nothing made sense until Brian Kotek pointed out the following URL:

Error on MulticastSocket.joinGroup()

This led to the following Microsoft Tech Note:

How to disable the Media Sensing feature for TCP/IP in Windows

And that did the trick. This "Media Sense" feature (which by the way impacted my Windows machine but not a coworker) was the culprit. As soon as I did the regedit (wow, it's been a long time since I did one of those) and rebooted, everything worked perfectly.

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Raymond is a developer advocate. He focuses on JavaScript, serverless and enterprise cat demos. If you like this article, please consider visiting my Amazon Wishlist or donating via PayPal to show your support. You can even buy me a coffee!

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