I have a webservice which I deployed to one of servers. The first 2 calls work as they don't bring any data back the next 2 fail on some machines all the time on others randomly UNLESS Fiddler is running !!! The error I am getting is in my other question. I tried using Fiddler to troubleshoot the error but it seems that Fiddler being the the proxy now everything works.
I believe I experienced your issue when I was still working on WSE 3.0 four years ago. I encountered cases when it works fine and then it errors out intermittently. I get different types of error including
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Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions.
Consider email address RFCs:
Look at HTML5 form input element (with type=email) regex pattern: