Just filed a bug report Cntlm crashes on Ubuntu 16.04.4 LTS (Xenial Xerus) cntlm[13869]: 192.168.150.59 CONNECT registry.npmjs.org:443 buffer overflow detected : cntlm terminated looking at the forums seems like there is very little support now
cntlm version CNTLM - Accelerating NTLM Authentication Proxy version 0.92.3
cntlm crashes on Ubuntu 16.04.4