我在logstash-forward 和logstash 之间遇到问题，我已经正确安装了SSL 证书，但出现此错误：
Failed to tls handshake with 111.111.111.111 read tcp 111.111.111.111:5000: i/o timeout
如果我使用 openssl 命令检查 SSL 是否正常工作：
# openssl s_client -connect 111.111.111.111:5000
CONNECTED(00000003)
depth=0 C = XX, L = Default City, O = Default Company Ltd
verify error:num=18:self signed certificate
verify return:1
depth=0 C = XX, L = Default City, O = Default Company Ltd
verify return:1
---
Certificate chain
0 s:/C=XX/L=Default City/O=Default Company Ltd
i:/C=XX/L=Default City/O=Default Company Ltd
---
Server certificate
-----BEGIN CERTIFICATE-----
.......
-----END CERTIFICATE-----
subject=/C=XX/L=Default City/O=Default Company Ltd
issuer=/C=XX/L=Default City/O=Default Company Ltd
---
No client certificate CA names sent
Server Temp Key: DH, 768 bits
---
SSL handshake has read 1677 bytes and written 413 bytes
---
New, TLSv1/SSLv3, Cipher is DHE-RSA-AES256-SHA
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
SSL-Session:
Protocol : TLSv1
Cipher : DHE-RSA-AES256-SHA
Session-ID: 5512D461475996E5795A8F65F7C73A7047D6A99D9BBF30871FD91EA80BF110FE
Session-ID-ctx:
Master-Key: C2FDF6944017E05247F103B106BA7313917C5B9BC516BFA05F875D4D8C0D294E797015FFA3E7BA5F744EF2D1E8925FB2
Key-Arg : None
Krb5 Principal: None
PSK identity: None
PSK identity hint: None
Start Time: 1427297377
Timeout : 300 (sec)
Verify return code: 18 (self signed certificate)
---
closed