Sitemap errors and warnings

hi all

always i get errors from google webmaster this is the details



and secand one ERULS



i have this problems since 3 month

during this 3 month i replaced my sitemap about 7 times but nothing change please need your help

thank you an advence

What are the unreachable URLs listed?

What is a link to your sitemap.

Network unreachable errors are directly related to your host. You should either contact them and fix those problems or move to a new host because Googlebot cannot reach to your server to download your sitemaps. This is a very serious problem.

what u suggest to fix this issue on the host because its looks every thing works perfectly ?

still watting your addvise

up

You should make sure your host is not blocking Google Bot

ok thanks a lot we will check & if something we will let you know about it
thanks you

well today google agreed my sitemap hi read it 3 times than hi give me onther errror

in sitemap_28.xml.gz Details is

Unsupported file format
Your Sitemap does not appear to be in a supported format. Please ensure it meets our Sitemap guidelines and resubmit. Help
Problem detected on:May 13, 2009

up

Again, what is the URL to your sitemap so I can look at it and see if anything looks wrong.

this is the url