Hello,
I have used xml_sitemap standalone program for years, I just updated to version 8.1 and I am now getting this same issue that is mentioned in this thread. I contacted my host and confirmed that everything is set properly on their end. There has been no change.
So I am back to you. I tried to go back to ver 8.0 but get this same error so ver 8.1 is installed on my server, I really would like it to work. Can you help? I attached a jpg of the error. Thanks