Proxy Error 502 : The proxy server received an invalid response from an upstream server

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We are building a mass mailing sending application in Java. Mail is being send by third party SMTP. After sending 400-500 mails tomcat6 service get stopped. Below is the error.

Proxy Error The proxy server received an invalid response from an upstream server. The proxy server could not handle the request GET /lin/Campaignn.jsp. Reason: Error reading from remote server

Additionally, a 502 Bad Gateway error was encountered while trying to use an ErrorDocument to handle the request.

Apache Server at msizzler.com Port 80

But when we are sending from localhost I did not received any error. It send all the mails. Please help me to sort it out this problem.

tomcat6 proxy email java
4 Answers

I had this issue once. It turned out to be database query issue. After re-create tables and index it has been fixed.

Although it says proxy error, when you look at server log, it shows execute query timeout. This is what I had before and how I solved it.

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