It's only got a few private forums, we're really only testing at this stage. It was working fine at first for all 3 of us (only 3 users so far), 2 of us on Windows, 1 on Mac.

The Mac user has suddenly started having problems loading the forum. He gets "the connection was reset" in firefox, "this webpage is not available" in chrome, and "safari can't open the page" in safari. He was the last person to make a post, but it was nothing unusual.

I am able to load the site on Windows in firefox, IE(6-8), chrome & safari, both logged in & out.

I am NOT able to load the site on my iPad (which makes me think it's a platform issue rather than a user issue).

We've made a few posts & uploaded a few files. The only admin setting I can recall changing that's out of the ordinary is to allow .docx & .xlsx uploads.

There are no repeated error logs for repeated tries by our Mac user. There was one error log entry around about the time he first had problems:

System.Web.HttpException: The state information is invalid for this page and might be corrupted. ---> System.Web.UI.ViewStateException: Invalid viewstate. 
	Client IP: 203.59.75.138
	Port: 53974
	User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_4; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.99 Safari/533.4
	ViewState: /

Since having problems I've tried the following additions to web.config, to no avail:

<pages validateRequest="false" enableEventValidation="false" viewStateEncryptionMode ="Never" enableViewStateMac="false" />

Now I'm pretty stuck. We definitely need the site to work on a Macintosh.

Any help would be greatly appreciated 🙂

Don't switch off ViewState checks if you're a bit concerned about security.

Thanks for the reply, I appreciate it, but it's not just safari on mac but also firefox & chrome.