Full_Name: Vernon Smith Version: 2.4.47 OS: Ubuntu 12.04 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (2601:40d:4300:679a:8d9a:95ec:46f9:30fd) I looked at the release notes and there have been a few issues with Async mode with TSL in 2.4. I had been using 2.3.20 with my own patches to make Async mode with TLS work with my aplication. I need to upgrade to 2.4 but I have tried many version of it and none have worked. The basic issue is that the TLS code is never called so LDAPS connections fail. My symptoms are very similar to the bug report that caused a fix in 2.4.26 but 2.4.26 is not working for me. I see the same issue with 2.4.47. If I don't use LDAP_OPT_CONNECT_ASYNC then the connection works and I get this trace: ldap_sasl_bind ldap_send_initial_request ldap_new_connection 1 1 0 ldap_int_open_connection ldap_connect_to_host: TCP test.interlinknetworks.com:636 ldap_new_socket: 10 ldap_prepare_socket: 10 ldap_connect_to_host: Trying 192.168.3.26:636 ldap_pvt_connect: fd: 10 tm: 3 async: 0 ldap_ndelay_on: 10 attempting to connect: connect errno: 115 ldap_int_poll: fd: 10 tm: 3 ldap_is_sock_ready: 10 ldap_ndelay_off: 10 ldap_pvt_connect: 0 TLS trace: SSL_connect:before/connect initialization TLS trace: SSL_connect:SSLv2/v3 write client hello A TLS trace: SSL_connect:unknown state TLS certificate verification: depth: 1, err: 0, subject: /C=AA/ST=Michigan/L=Ann Arbor/O=Interlink Networks, Inc./OU=Quality Assurance/CN=autoTest CA/emailAddress=QAtest(a)interlinknetworks.com, issuer: /C=AA/ST=Michigan/L=Ann Arbor/O=Interlink Networks, Inc./OU=Quality Assurance/CN=autoTest CA/emailAddress=QAtest(a)interlinknetworks.com TLS certificate verification: depth: 0, err: 0, subject: /C=US/ST=Michigan/L=Ann Arbor/O=Interlink Networks Services, LLC./OU=Quality Assurance/CN=test.interlinknetworks.com/emailAddress=QAtest@interlinknetw..., issuer: /C=AA/ST=Michigan/L=Ann Arbor/O=Interlink Networks, Inc./OU=Quality Assurance/CN=autoTest CA/emailAddress=QAtest(a)interlinknetworks.com TLS trace: SSL_connect:unknown state TLS trace: SSL_connect:unknown state TLS trace: SSL_connect:unknown state TLS trace: SSL_connect:unknown state TLS trace: SSL_connect:unknown state TLS trace: SSL_connect:unknown state TLS trace: SSL_connect:unknown state TLS trace: SSL_connect:unknown state ldap_open_defconn: successful ldap_send_server_request But with LDAP_OPT_CONNECT_ASYNC enabled I never see the TLS code called and the connection fails. The trace is: ldap_sasl_bind ldap_send_initial_request ldap_new_connection 1 1 0 ldap_int_open_connection ldap_connect_to_host: TCP test.interlinknetworks.com:636 ldap_new_socket: 10 ldap_prepare_socket: 10 ldap_connect_to_host: Trying 192.168.3.26:636 ldap_pvt_connect: fd: 10 tm: 3 async: -1 ldap_ndelay_on: 10 attempting to connect: connect errno: 115 ldap_open_defconn: successful ldap_send_server_request ... ldap_result ld 0x9bd6f70 msgid 1 wait4msg ld 0x9bd6f70 msgid 1 (timeout 0 usec) wait4msg continue ld 0x9bd6f70 msgid 1 all 1 ** ld 0x9bd6f70 Connections: * host: test.interlinknetworks.com port: 636 (default) refcnt: 2 status: Connected last used: Mon Jan 14 15:33:57 2019 ** ld 0x9bd6f70 Outstanding Requests: * msgid 1, origid 1, status InProgress outstanding referrals 0, parent count 0 ld 0x9bd6f70 request count 1 (abandoned 0) ** ld 0x9bd6f70 Response Queue: Empty ld 0x9bd6f70 response count 0 ldap_chkResponseList ld 0x9bd6f70 msgid 1 all 1 ldap_chkResponseList returns ld 0x9bd6f70 NULL ldap_int_select read1msg: ld 0x9bd6f70 msgid 1 all 1 ber_get_next failed. ldap_err2string ... Can't contact LDAP server Thanks, Vern