diff --git a/llarp/ev.cpp b/llarp/ev.cpp
index 208c1e069..d046a9d60 100644
--- a/llarp/ev.cpp
+++ b/llarp/ev.cpp
@@ -111,11 +111,27 @@ llarp_ev_udp_sendto(struct llarp_udp_io *udp, const sockaddr *to,
                     const void *buf, size_t sz)
 {
   auto ret = static_cast< llarp::ev_io * >(udp->impl)->sendto(to, buf, sz);
+#ifndef _WIN32
   if(ret == -1 && errno != 0)
   {
+#else
+  if(ret == -1 && WSAGetLastError())
+  {
+#endif
+
+#ifndef _WIN32
     llarp::LogWarn("sendto failed ", strerror(errno));
     errno = 0;
   }
+#else
+  char ebuf[1024];
+  int err = WSAGetLastError();
+  FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, err, LANG_NEUTRAL, ebuf,
+                1024, nullptr);
+  llarp::LogWarn("sendto failed: ", buf, ":", err);
+    WSASetLastError(0);
+	}
+#endif
   return ret;
 }
 
diff --git a/llarp/ev.hpp b/llarp/ev.hpp
index cd9ee162d..98a44140b 100644
--- a/llarp/ev.hpp
+++ b/llarp/ev.hpp
@@ -248,17 +248,21 @@ namespace llarp
               return;
             }
             m_BlockingWriteQueue->pop_front();
-            if(errno == EAGAIN || errno == EWOULDBLOCK)
+            int wsaerr = WSAGetLastError();
+            int syserr = GetLastError();
+            if(wsaerr == WSA_IO_PENDING || wsaerr == WSAEWOULDBLOCK
+               || syserr == 997 || syserr == 21)
             {
-              errno = 0;
+              SetLastError(0);
+              WSASetLastError(0);
               return;
             }
           }
         }
       }
       /// reset errno
-      errno = 0;
       SetLastError(0);
+      WSASetLastError(0);
     }
 
     std::unique_ptr< LossyWriteQueue_t > m_LossyWriteQueue;
@@ -586,7 +590,15 @@ namespace llarp
     {
       if(_conn)
       {
+#ifndef _WIN32
         llarp::LogError("tcp_conn error: ", strerror(errno));
+#else
+        char ebuf[1024];
+        int err = WSAGetLastError();
+        FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, err, LANG_NEUTRAL,
+                      ebuf, 1024, nullptr);
+        llarp::LogError("tcp_conn error: ", ebuf);
+#endif
         if(_conn->error)
           _conn->error(_conn);
       }
@@ -632,7 +644,7 @@ namespace llarp
 struct llarp_ev_loop
 {
   byte_t readbuf[EV_READ_BUF_SZ] = {0};
-  llarp_time_t _now              = 0;
+  llarp_time_t _now = 0;
   virtual bool
   init() = 0;
   virtual int
diff --git a/llarp/ev_win32.hpp b/llarp/ev_win32.hpp
index 172a282c3..1dda401cb 100644
--- a/llarp/ev_win32.hpp
+++ b/llarp/ev_win32.hpp
@@ -65,17 +65,21 @@ namespace llarp
       llarp::LogDebug("connected immedidately");
       connected();
     }
-    else if(errno == EINPROGRESS)
+    else if(WSAGetLastError() == WSAEINPROGRESS)
     {
       // in progress
       llarp::LogDebug("connect in progress");
-      errno = 0;
+      WSASetLastError(0);
       return;
     }
     else if(_conn->error)
     {
       // wtf?
-      llarp::LogError("error connecting ", strerror(errno));
+      char ebuf[1024];
+      int err = WSAGetLastError();
+      FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, err, LANG_NEUTRAL,
+                    ebuf, 1024, nullptr);
+      llarp::LogError("error connecting: ", ebuf);
       _conn->error(_conn);
     }
   }
@@ -86,7 +90,11 @@ namespace llarp
     int new_fd = ::accept(fd.socket, nullptr, nullptr);
     if(new_fd == -1)
     {
-      llarp::LogError("failed to accept on ", fd.socket, ":", strerror(errno));
+      char ebuf[1024];
+      int err = WSAGetLastError();
+      FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, err, LANG_NEUTRAL,
+                    ebuf, 1024, nullptr);
+      llarp::LogError("failed to accept on ", fd.socket, ":", ebuf);
       return -1;
     }
     // build handler
@@ -170,7 +178,11 @@ namespace llarp
       }
       if(tuntap_up(tunif) == -1)
       {
-        llarp::LogWarn("failed to put interface up: ", strerror(errno));
+        char ebuf[1024];
+        int err = GetLastError();
+        FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, err, LANG_NEUTRAL,
+                      ebuf, 1024, nullptr);
+        llarp::LogWarn("failed to put interface up: ", ebuf);
         return false;
       }
 
@@ -238,7 +250,11 @@ namespace llarp
       ssize_t sent = ::sendto(fd.socket, (char*)data, sz, 0, to, slen);
       if(sent == -1)
       {
-        llarp::LogWarn(strerror(errno));
+        char ebuf[1024];
+        int err = WSAGetLastError();
+        FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, err, LANG_NEUTRAL,
+                      ebuf, 1024, nullptr);
+        llarp::LogWarn(ebuf);
       }
       return sent;
     }
diff --git a/llarp/link/utp.cpp b/llarp/link/utp.cpp
index 50fbf7972..ff4e4438c 100644
--- a/llarp/link/utp.cpp
+++ b/llarp/link/utp.cpp
@@ -330,12 +330,24 @@ namespace llarp
             static_cast< LinkLayer* >(utp_context_get_userdata(arg->context));
         llarp::LogDebug("utp_sendto ", Addr(*arg->address), " ", arg->len,
                         " bytes");
+#ifndef _WIN32
         if(::sendto(l->m_udp.fd, (char*)arg->buf, arg->len, arg->flags,
                     arg->address, arg->address_len)
                == -1
            && errno)
+#else
+        WSASetLastError(0);
+        if(::sendto(l->m_udp.fd, (char*)arg->buf, arg->len, arg->flags,
+                    arg->address, arg->address_len)
+           == -1)
+#endif
         {
-          llarp::LogError("sendto failed: ", strerror(errno));
+          char buf[1024];
+          int err = WSAGetLastError();
+          FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, err, LANG_NEUTRAL,
+                        buf, 1024, nullptr);
+          llarp::LogError("sendto failed: ", buf);
+          llarp::LogInfo("flags: ", arg->flags);
         }
         return 0;
       }