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@amadio commented on this pull request.

In src/XrdHttp/XrdHttpProtocol.cc:

> @@ -1759,10 +1759,17 @@ void XrdHttpProtocol::Cleanup() {
 
   if (ssl) {
 
-
-    if (SSL_shutdown(ssl) != 1) {
-      TRACE(ALL, " SSL_shutdown failed");
-      ERR_print_errors(sslbio_err);
+    int ret = SSL_shutdown(ssl);
+    if (ret != 1) {
+        if(ret == 0) {
+            //https://www.openssl.org/docs/man1.0.2/man3/SSL_shutdown.html
+            //Call again SSL_shutdown
+            ret = SSL_shutdown(ssl);

From the documentation, it sounds like we ought to check if no error is present before calling this.

Note that SSL_shutdown() must not be called if a previous fatal error has occurred on a connection

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