Hi, It seems that we have a serious NetNameResolver regression: instead of signalling an exception, a bogus value is returned. Pharo 7: [ NetNameResolver addressForName: 'unknown-stfx.eu' timeout: 10 ] on: NameLookupFailure do: [ :exception | exception ]. "NameLookupFailure: cannot resolve 'unknown-stfx.eu'" Pharo 9: [ NetNameResolver addressForName: 'unknown-stfx.eu' timeout: 10 ] on: NameLookupFailure do: [ :exception | exception ]. "0.0.0.0" This is bad. What is even worse is that the following kills your image without leaving any trace (on macOS): ZnClient new get: 'http://unknown-stfx.eu'. Because it tries to connect to 0.0.0.0 On linux, at least there is a backtrace: sven@stfx-1:~/pharo$ rlwrap ./pharo reddit.image NeoConsole repl NeoConsole Pharo-9.0.0+build.1528.sha.29269ecfac2cbf6a56dfee232b7d3355e5cb77bd (64 Bit) pharo> NetNameResolver addressForName: 'unknown-stfx.eu' timeout: 10. 0.0.0.0 pharo> ZnClient new get: 'http://unknown-stfx.eu'. ConnectionTimedOut: Cannot connect to 0.0.0.0:80 [ConnectionTimedOut signal: 'Cannot connect to ' , (NetNameResolver stringFromAddress: hostAddress) , ':' , port asString] in Socket>>connectTo:port:waitForConnectionFor: Receiver: a Socket[unconnected] Arguments and temporary variables: hostAddress: 0.0.0.0 port: 80 timeout: 30 Receiver's instance variables: semaphore: a Semaphore() socketHandle: #[198 113 243 96 0 0 0 0 240 65 61 2 0 0 0 0] readSemaphore: a Semaphore() writeSemaphore: a Semaphore() Socket>>waitForConnectionFor:ifTimedOut: Socket>>connectTo:port:waitForConnectionFor: ZdcSocketStream(ZdcAbstractSocketStream)>>socketConnectTo:port: ZdcSocketStream(ZdcSimpleSocketStream)>>connectTo:port: ZdcSocketStream class(ZdcSimpleSocketStream class)>>openConnectionToHost:port:timeout: ZnNetworkingUtils>>socketStreamToUrlDirectly: ZnNetworkingUtils>>socketStreamToUrl: ZnNetworkingUtils class>>socketStreamToUrl: I had a quick look at changes to Network-Kernel but had no luck yet. Because of this running Zinc HTTP Components tests on macOS Pharo 9 also kills the image (ZnClientTest>>#testIfFailNonExistingHost). Of course, NetNameResolverTest does not do enough. Sven