Skip to main content

This content has been archived and is no longer being updated. Links may not function; however, this content may be relevant to outdated versions of the product.

Support Article

Unable to access application after update



Unable to access application post upgrade of the servers and PRPC version.

Error Messages

Error 503: PegaRules server not available.

.UnknownLocalException: nested exception is: Error determining the mode of PRPC install from database.

Steps to Reproduce

Start the application server.

Root Cause

Wrong version of OJDBC driver (Ojdbc6) was used to connect to database.


With Java 8 it is advised to use ojdbc7.jar in the support guide.

Published May 24, 2017 - Updated October 8, 2020

Was this useful?

0% found this useful

Have a question? Get answers now.

Visit the Collaboration Center to ask questions, engage in discussions, share ideas, and help others.

Did you find this content helpful?

Want to help us improve this content?

We'd prefer it if you saw us at our best.

Pega Community has detected you are using a browser which may prevent you from experiencing the site as intended. To improve your experience, please update your browser.

Close Deprecation Notice
Contact us