Hi, I’ve the same problem.
I checked the cURL version with “wordpress php info”:
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cURL support enabled
cURL Information 7.47.1
Age 3
Features
AsynchDNS Yes
CharConv No
Debug No
GSS-Negotiate No
IDN Yes
IPv6 No
krb4 No
Largefile Yes
libz Yes
NTLM Yes
NTLMWB Yes
SPNEGO No
SSL Yes
SSPI No
TLS-SRP No
Protocols dict, file, ftp, ftps, gopher, http, https, imap, imaps, ldap, ldaps, pop3, pop3s, rtsp, smb, smbs, smtp, smtps, telnet, tftp
Host x86_64-pc-linux-gnu
SSL Version OpenSSL/1.0.1e
ZLib Version 1.2.3
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the version of plugin i use is 4.0.3
please help me.