I also had this error after the latest update from WordPress, but it also seemed to coincide with a recent update of PHP5. I run a couple of websites that use Woocommerce. These sites have run for about a year without issues. Woocommerce has a nice System Status checker that shows the status of everything. After the updates, there were two red x’s by wp_remote_post() and wp_remote_get(), saying that both of these WordPress functions were failing. It reported that cURL and OpenSSL are working properly, however.
Upon further investigation, the function “curl_exec” was in the php.ini list of functions that are disabled–how it got there, I don’t know except maybe it was added during the PHP update. When I removed this function from the disabled functions list in php.ini, and restarted the php5-fpm service, the errors went away and I was able to add plugins and resume the function of my website.
The specific error that I received when trying to “Add New” plugins was: “An unexpected error occurred. Something may be wrong with www.remarpro.com or this server’s configuration. If you continue to have problems, please try the support forums.”
I no longer receive this error.