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Alexander LandmannAlexander Landmann 

Community site error when login in:

Since yesterday when customers try to log in to one of our communities they all receive the following message:
An internal server error has occurred
An error has occurred while processing your request. The salesforce.com support team has been notified of the problem. If you believe you have additional information that may be of help in reproducing or correcting the error, please contact Salesforce Support. Please indicate the URL of the page you were requesting, any error id shown on this page as well as any other related information. We apologize for the inconvenience.

Thank you again for your patience and assistance. And thanks for using salesforce.com!

Error ID: 943551264-3203 (261961917)

Has anyone seen this error and have an idea where the problem is coming from?
NagendraNagendra (Salesforce Developers) 
Hi Alexander,

This type of error indicates that an error has occurred that hasn't been trapped by the platform - a low-level java exception for example.  All you can really do in terms of resolution is raise this with support and wait for a response.
If you need to move quicker than, start removing functionality from the component to isolate where the problem occurs and see if there are any other mechanisms you can use.

You can reach support team here:

Please mark this as solved if it's resolved so that it gets removed from the unanswered queue which results in helping others who are encountering a similar issue.