diff -up cups-1.5b1/cups/http-addr.c.res_init cups-1.5b1/cups/http-addr.c
--- cups-1.5b1/cups/http-addr.c.res_init	2011-04-16 01:38:13.000000000 +0200
+++ cups-1.5b1/cups/http-addr.c	2011-05-24 15:56:50.000000000 +0200
@@ -256,7 +256,8 @@ httpAddrLookup(
 
     if (error)
     {
-      if (error == EAI_FAIL)
+      if (error == EAI_FAIL || error == EAI_AGAIN || error == EAI_NODATA ||
+          error == EAI_NONAME)
         cg->need_res_init = 1;
 
       return (httpAddrString(addr, name, namelen));
diff -up cups-1.5b1/cups/http-addrlist.c.res_init cups-1.5b1/cups/http-addrlist.c
--- cups-1.5b1/cups/http-addrlist.c.res_init	2011-05-20 05:49:49.000000000 +0200
+++ cups-1.5b1/cups/http-addrlist.c	2011-05-24 15:56:50.000000000 +0200
@@ -386,7 +386,8 @@ httpAddrGetList(const char *hostname,	/*
 
       freeaddrinfo(results);
     }
-    else if (error == EAI_FAIL)
+    else if (error == EAI_FAIL || error == EAI_AGAIN || error == EAI_NODATA ||
+             error == EAI_NONAME)
       cg->need_res_init = 1;
 
 #else