yum update
yum install wget tar make gcc perl pcre-devel zlib-devel
wget https://www.openssl.org/source/openssl-1.1.1l.tar.gz
tar zxvf openssl-1.1.1l.tar.gz
cd openssl-1.1.1l
./config --prefix=/usr --openssldir=/etc/ssl --libdir=lib no-shared zlib-dynamic
make
make install
export LD_LIBRARY_PATH=/usr/local/lib:/usr/local/lib64
echo "export LD_LIBRARY_PATH=/usr/local/lib:/usr/local/lib64" >> ~/.bashrc
openssl version
就可以看到已经升级为OpenSSL 1.1.1了
openssl version -a
cp /etc/pki/tls/cert.pem /usr/local/openssl/
OPENSSLDIR: "/etc/ssl"
ENGINESDIR: "/usr/lib/engines-1.1"
报错信息：The SSL connection could not be established, see inner exception.
看起来是SSL的问题，查了下资料和服务器安装了 OpenSSL 有关，直接拷贝一份证书过去，问题即可解决，执行以下linux命令即可：
cp /etc/pki/tls/cert.pem /usr/local/openssl/
然后重启你的.net core应用即可。
https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/117136503
- established connection exception 办法 Centosestablished connection exception办法 establishing connection wordpress database establishment connections servertoo rejected successfully established connection server error successfully established connection establishing verification connection recommende establishing verification recommended connection verification connection establish服务器 connection_id connection establish状态 messagingexception quot exception connect