We are using lightstreamer os x client in our project. Recently, we saw some crash related to NSURLConnection. However, we dont use this class in our code so we doubt this could be a issue caused by Lightstreamer. The version we currently use is pretty old and not sure if this is a fixed issue or not. Our testing environment is OS X 10.10.

Code:
Crashed Thread:        3  com.apple.NSURLConnectionLoader


Exception Type:        EXC_GUARD
Exception Codes:       0x400000010000003f, 0x00007ffbd7fa58e0Thread 3 Crashed:: com.apple.NSURLConnectionLoader
0   libsystem_kernel.dylib        	0x00007fff91c6fba2 close + 10
1   com.apple.security            	0x00007fff920f9e0e Security::AtomicBufferedFile::~AtomicBufferedFile() + 22
2   com.apple.security            	0x00007fff921f6da6 Security::RefPointer<Security::AtomicBufferedFile>::release_internal() + 66
3   com.apple.security            	0x00007fff920f7c2c Security::RefPointer<Security::AtomicBufferedFile>::release() + 30
4   com.apple.security            	0x00007fff921f6d2f Security::RefPointer<Security::AtomicBufferedFile>::~RefPointer() + 15
5   com.apple.security            	0x00007fff920f5ad1 Security::DbModifier::getDbVersion(bool) + 437
6   com.apple.security            	0x00007fff920f58fd Security::DbModifier::openDatabase() + 55
7   com.apple.security            	0x00007fff920f55d9 Security::Database::_dbOpen(Security::DatabaseSession&, unsigned int, Security::AccessCredentials const*, void const*) + 85
8   com.apple.security            	0x00007fff920f4ec5 Security::DatabaseManager::dbOpen(Security::DatabaseSession&, Security::DbName const&, unsigned int, Security::AccessCredentials const*, void const*) + 67
9   com.apple.security            	0x00007fff920f4b88 Security::DatabaseSession::DbOpen(char const*, cssm_net_address const*, unsigned int, Security::AccessCredentials const*, void const*, long&) + 156
10  com.apple.security            	0x00007fff92103f5a cssm_DbOpen(long, char const*, cssm_net_address const*, unsigned int, cssm_access_credentials const*, void const*, long*) + 219
11  com.apple.security            	0x00007fff92103c9f CSSM_DL_DbOpen + 111
12  com.apple.security            	0x00007fff92102f6e Security::CssmClient::DbImpl::open() + 212
13  com.apple.security            	0x00007fff92104355 SSDatabaseImpl::open(Security::DLDbIdentifier const&) + 59
14  com.apple.security            	0x00007fff921040a1 SSDLSession::DbOpen(char const*, cssm_net_address const*, unsigned int, Security::AccessCredentials const*, void const*, long&) + 245
15  com.apple.security            	0x00007fff92103f5a cssm_DbOpen(long, char const*, cssm_net_address const*, unsigned int, cssm_access_credentials const*, void const*, long*) + 219
16  com.apple.security            	0x00007fff92103c9f CSSM_DL_DbOpen + 111
17  com.apple.security            	0x00007fff92102f6e Security::CssmClient::DbImpl::open() + 212
18  com.apple.security            	0x00007fff9210c05b Security::KeychainCore::KCCursorImpl::next(Security::KeychainCore::Item&) + 577
19  com.apple.security            	0x00007fff9213c8cb SecIdentityCopyPreference + 724
20  com.apple.CFNetwork           	0x00007fff8ff1e037 HTTPProtocolSSLSupport::getSSLCertsCached(__CFString const*) + 237
21  com.apple.CFNetwork           	0x00007fff8ff1db84 HTTPProtocol::copyProtocolPropertiesForStream() + 608
22  com.apple.CFNetwork           	0x00007fff8ff2f3fb HTTPProtocol::setProtocolPropertiesToStream() + 19
23  com.apple.CFNetwork           	0x00007fff8ff2f1d8 HTTPProtocol::openStream() + 42
24  com.apple.CFNetwork           	0x00007fff8ff2e3bd HTTPProtocol::useNetStreamInfoForRequest(MetaNetStreamInfo*, HTTPRequestMessage const*, unsigned char) + 1607
25  com.apple.CFNetwork           	0x00007fff8ff2db39 HTTPConnectionCacheEntry::dispatchConnectionToProtocol(HTTPNetConnection*, HTTPConnectionCacheEnqueuedRequestInfo*, unsigned char) + 265
26  com.apple.CFNetwork           	0x00007fff8ff2be31 HTTPConnectionCacheEntry::ingestTube(Tube*) + 1189
27  com.apple.CFNetwork           	0x00007fff8ff2b618 HTTPConnectionCache::_onqueue_ingestTube(Tube*) + 120
28  com.apple.CFNetwork           	0x00007fff8ff2ae47 TubeManager::_onqueue_newTubeReady(Tube*, __CFError*) + 493
29  com.apple.CFNetwork           	0x00007fff8ff2ac30 ___ZN11TubeManager12newTubeReadyEP4TubeP9__CFError_block_invoke + 30
30  com.apple.CFNetwork           	0x00007fff8ff14cec RunloopBlockContext::_invoke_block(void const*, void*) + 72
31  com.apple.CoreFoundation      	0x00007fff92787664 CFArrayApplyFunction + 68
32  com.apple.CFNetwork           	0x00007fff8ff14bad RunloopBlockContext::perform() + 133
33  com.apple.CFNetwork           	0x00007fff8ff14998 MultiplexerSource::perform() + 282
34  com.apple.CFNetwork           	0x00007fff8ff147ba MultiplexerSource::_perform(void*) + 72
35  com.apple.CoreFoundation      	0x00007fff927bba01 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
36  com.apple.CoreFoundation      	0x00007fff927adb8d __CFRunLoopDoSources0 + 269
37  com.apple.CoreFoundation      	0x00007fff927ad1bf __CFRunLoopRun + 927
38  com.apple.CoreFoundation      	0x00007fff927acbd8 CFRunLoopRunSpecific + 296
39  com.apple.CFNetwork           	0x00007fff8ff07220 +[NSURLConnection(Loader) _resourceLoadLoop:] + 434
40  com.apple.Foundation          	0x00007fff88b99dc2 __NSThread__main__ + 1345
41  libsystem_pthread.dylib       	0x00007fff8f47b268 _pthread_body + 131
42  libsystem_pthread.dylib       	0x00007fff8f47b1e5 _pthread_start + 176
43  libsystem_pthread.dylib       	0x00007fff8f47941d thread_start + 13