Hello, I ran across this problem when I moved my code to another system. Not sure if this is the right list to post this, but I've been having trouble debugging this as all of my attempts have lead me to dead ends. I have the following code with boost 1.47: try { m_messageQueue = boost::shared_ptrboost::interprocess::message_queue( new boost::interprocess::message_queue ( boost::interprocess::open_or_create ,name.c_str() //name ,numElements //max message number ,sizeof(Message) //max message size )); } catch(boost::interprocess::interprocess_exception &e) { cerr << e.what(); } where name="test_queue", numElements=100, and sizeof(Message)=256. The output is: Permission denied If I run as user root, it will pass. I can't figure out where it is trying to write to where it would have a permission error. Looking at the boost code, shouldn't it just be in /tmp/boost_interprocess which any user would have access to create and write to? Also, I noticedhttps://svn.boost.org/trac/boost/ticket/4250, but this should be fixed now. Any help or insight would be appreciated. Thanks, Matt