Today, I’ve been working in an environment that uses a Bamboo calendar web part for some improved collaboration. This a standard medium/small farm with two load balanced WFEs, a “application server” for indexing and InfoPath and a clustered SQL back end.
The client installed some disaster recovery software onto one of the WFEs and that resulted in a broken WFE for a specific site in the site collection. Whenever load balancing pointed at the affected WFE and that site, users saw a largely blank white screen with the sentence “An unexpected error occurred”. No other info showed, just that sentence.
They asked me to look at it. I easily reproduced the problem and then added a ?contents=1 to the end of the URL. This is how I learned they were using the Bamboo web part. I went back to the page and now, suddenly, it showed me a nice orderly error message:
I don’t know what was happening or what I did to get the controlled error message to display other than appending the ?contents=1 bit of the query string.
This is probably a very rare edge case but if you get that message, “An unexpected error occurred” go ahead and add ?contents=1 to the query string and see where that leads.
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