diff --git a/History.md b/History.md
index 9f57e08355..70b89f9300 100644
--- a/History.md
+++ b/History.md
@@ -1,6 +1,8 @@
 ## 5.2.1 / 2021-01-
 
 * Bugfixes
+  * Fix TCP cork/uncork operations to work with ssl clients (#2550)
+  * Require rack/common_logger explicitly if :verbose is true ([#2547])
   * MiniSSL::Socket#write - use data.byteslice(wrote..-1) ([#2543])
 
 ## 5.2.0 / 2021-01-27
@@ -19,7 +21,6 @@
   * Fix phased restart errors related to nio4r gem when using the Puma control server ([#2516])
   * Add `#string` method to `Puma::NullIO` ([#2520])
   * Fix binding via Rack handler to IPv6 addresses ([#2521])
-  * Require rack/common_logger explicitly if :verbose is true ([#2547])
 
 * Refactor
   * Refactor MiniSSL::Context on MRI, fix MiniSSL::Socket#write ([#2519])
diff --git a/lib/puma/request.rb b/lib/puma/request.rb
index 415d15cc75..8a629bf3d9 100644
--- a/lib/puma/request.rb
+++ b/lib/puma/request.rb
@@ -30,7 +30,7 @@ module Request
     #
     def handle_request(client, lines)
       env = client.env
-      io = client.io
+      io  = client.io   # io may be a MiniSSL::Socket
 
       return false if closed_socket?(io)
 
diff --git a/lib/puma/server.rb b/lib/puma/server.rb
index d60d64742f..8985b83c27 100644
--- a/lib/puma/server.rb
+++ b/lib/puma/server.rb
@@ -120,17 +120,13 @@ def current
       # :nodoc:
       # @version 5.0.0
       def tcp_cork_supported?
-        RbConfig::CONFIG['host_os'] =~ /linux/ &&
-          Socket.const_defined?(:IPPROTO_TCP) &&
-          Socket.const_defined?(:TCP_CORK)
+        Socket.const_defined?(:TCP_CORK) && Socket.const_defined?(:IPPROTO_TCP)
       end
 
       # :nodoc:
       # @version 5.0.0
       def closed_socket_supported?
-        RbConfig::CONFIG['host_os'] =~ /linux/ &&
-          Socket.const_defined?(:IPPROTO_TCP) &&
-          Socket.const_defined?(:TCP_INFO)
+        Socket.const_defined?(:TCP_INFO) && Socket.const_defined?(:IPPROTO_TCP)
       end
       private :tcp_cork_supported?
       private :closed_socket_supported?
@@ -138,6 +134,7 @@ def closed_socket_supported?
 
     # On Linux, use TCP_CORK to better control how the TCP stack
     # packetizes our stream. This improves both latency and throughput.
+    # socket parameter may be an MiniSSL::Socket, so use to_io
     #
     if tcp_cork_supported?
       UNPACK_TCP_STATE_FROM_TCP_INFO = "C".freeze
@@ -146,16 +143,18 @@ def closed_socket_supported?
       # 3 == TCP_CORK
       # 1/0 == turn on/off
       def cork_socket(socket)
+        skt = socket.to_io
         begin
-          socket.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_CORK, 1) if socket.kind_of? TCPSocket
+          skt.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_CORK, 1) if skt.kind_of? TCPSocket
         rescue IOError, SystemCallError
           Thread.current.purge_interrupt_queue if Thread.current.respond_to? :purge_interrupt_queue
         end
       end
 
       def uncork_socket(socket)
+        skt = socket.to_io
         begin
-          socket.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_CORK, 0) if socket.kind_of? TCPSocket
+          skt.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_CORK, 0) if skt.kind_of? TCPSocket
         rescue IOError, SystemCallError
           Thread.current.purge_interrupt_queue if Thread.current.respond_to? :purge_interrupt_queue
         end