Difference between revisions of "FAQ"

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* [[Troubleshooting]]
* [[Troubleshooting]]
==External Links==
* PC² [[FAQ]] [http://www.ecs.csus.edu/pc2/doc/faq on-line here]
* PC² [[FAQ]] [http://www.ecs.csus.edu/pc2/doc/faq on-line here]
[[Category:Troubleshooting, FAQ and Support]]
[[Category:Troubleshooting, FAQ and Support]]

Revision as of 20:33, 16 January 2018

Frequently Asked Questions (FAQ) are maintained on the PC² web site.

If you are troubleshooting or trying to get PC² to work, read the Troubleshooting section.

Click here to view FAQ.

FAQ Sections

Unable to login as admin using Java 1.8

This problem has been found only with Java 1.8.0_161 and pc2 version 9.5.2 and earlier. There is a work around below.

The symptoms are as follows:

  1. The server startup seems to work
  2. When logging in the Admin is stuck with a busy (hourglass) cursor
  3. In the pc2 server log file there will be a an error (see below)

Java 1.8.0_161 and later have changed encryption and that causes a login problem and more. Since pc2 encrypts both network communications and files - both areas are affected.


To work around this problem one must specify true for a system property jdk.crypto.KeyAgreement.legacyKDF. So in each pc2 script, ex pc2server or pc2admin one must add the java system property


just after the javaw command, thus

javaw -Djdk.crypto.KeyAgreement.legacyKDF=true 

In the pc2 server log there will be an error message

java.security.NoSuchAlgorithmException: Unsupported secret key algorithm: DES

Future fix

The pc2 development team is working on a fix for this problem. An announcement will be sent to the pc2 announcements mail list.

See Also