验证LDAPS连接的自签名证书

我想从Linux(Linux 3.2.0-4-amd64#1 SMP Debian 3.2.51-1 x86_64 GNU/Linux)客户端到Windows 2012服务器建立安全的ldap连接(ldaps),以更改活动中的用户密码目录,通过PHP.为此,我在服务器上创建了一个自签名证书(使用Windows Server Manager),但是当我尝试连接时,我收到以下错误(通过打开调试选项:) ldap_set_option(NULL, LDAP_OPT_DEBUG_LEVEL, 7);:

ldap_create                                                                 
ldap_url_parse_ext(ldaps://xxx.xxx.xxx.xxx)                                 
ldap_bind_s                                                                 
ldap_simple_bind_s                                                          
ldap_sasl_bind_s                                                            
ldap_sasl_bind                                                              
ldap_send_initial_request                                                   
ldap_new_connection 1 1 0                                                   
ldap_int_open_connection                                                    
ldap_connect_to_host: TCP xxx.xxx.xxx.xxx:636                               
ldap_new_socket: 3                                                          
ldap_prepare_socket: 3                                                      
ldap_connect_to_host: Trying xxx.xxx.xxx.xxx:636                            
ldap_pvt_connect: fd: 3 tm: -1 async: 0                                     
TLS: peer cert untrusted or revoked (0x42)                                  
TLS: can't connect: (unknown error code).                                   
ldap_err2string                                                             
PHP Warning:  ldap_bind(): Unable to bind to server 

似乎客户端无法信任证书,因为它是自签名的.

我应采取哪些步骤来建立安全连接？客户端证书存储在/etc/ssl/certs/ca-certificates.crt