diff -ur ejabberd-1.1.3/src/tls/tls_drv.c ejabberd-1.1.3-certificate_chain/src/tls/tls_drv.c
--- ejabberd-1.1.3/src/tls/tls_drv.c	2006-08-04 04:25:10.000000000 +0200
+++ ejabberd-1.1.3-certificate_chain/src/tls/tls_drv.c	2007-08-26 19:48:11.563472538 +0200
@@ -108,7 +108,7 @@
 	 d->ctx = SSL_CTX_new(SSLv23_method());
 	 die_unless(d->ctx, "SSL_CTX_new failed");
 
-	 res = SSL_CTX_use_certificate_file(d->ctx, buf, SSL_FILETYPE_PEM);
+	 res = SSL_CTX_use_certificate_chain_file(d->ctx, buf);
 	 die_unless(res > 0, "SSL_CTX_use_certificate_file failed");
 
 	 res = SSL_CTX_use_PrivateKey_file(d->ctx, buf, SSL_FILETYPE_PEM);