problem in Sitemap Generator white page

I have problem with Sitemap Generator every time I Generatorsite-map it come a white page and recover an e-mail telling me it done

any one can help plz

كل مره احاول انه اولد الخرائط يدويا تظهر لي صفحة بيضا وتجيني رسالة ع الايميل انه تم عملها ممكن حل لها ؟!

Hello,
You may need to increase your wait_timeout setting on your server, or remove some sections from the sitemap (such as the yahoo compatible file that is no longer necessary (yahoo suports XML now)).

how I do this increase your wait_timeout setting on your server

and I'm already uncheek yahoo,poll.blog,blog tag,album,group,tags from the sitemap

if you may give me the right setting plz

I use sitemap 2.5

You will need to edit the php.ini file on your server. If you don't have root access, you will need to ask your host to do this for you.

Another option is to reduce the number of URLs in each file made.

how I can do that

via SSH. If you don't have SSH access, you will need to consult your host/server company.

okay I will ask him about SSH and php.ini hope he gonna help

hey they tell me the already enable it at the serves

What did they enable? wait_timeout cannot be disabled. it's a variable/setting in php.ini

he tell me it enable in the server

What is "it"?

this php.ini

what I tell them about it

the value for wait_timeout variable needs to be raised. default is a low number. Try increasing to double what it is (ie, 30 to 60)

I told them and they reply the value for wait_timeout is 60

this msg today I have it from vBSEO Google/Yahoo Sitemap Updated‏

Total Indexed URLs: 222237
Total Processing Time: 199.04 seconds

You can try disabling some un-necessary items such as
-yahoo txt map (yahoo supports XML version now, so this is not necessary)
-showpost urls