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# Chapter 28. Troubleshooting

## Graph hangs and is un-killable

Graph can sometimes hang and be un-killable if some network connection in it hangs. This can be improved by setting a shorter tcp-keepalive so that the connection times out earlier. The default value on Linux is 2 hours (7,200 seconds). You can set it to 10 minutes (600 seconds).

See http://tldp.org/HOWTO/TCP-Keepalive-HOWTO/usingkeepalive.html on tcp-timeout in Linux.

The file descriptor can be closed manually using `gdb`. See http://stackoverflow.com/questions/5987820/how-to-close-file-descriptor-via-linux-shell-command/12058001#12058001.

## SSL/TLS Issues

### Java 7 and HTTPS

There may be issues when using Java 7 and HTTPS-based communication. There are servers that do not support TLS 1.0 (Transport Layer Security) protocol anymore and the Java 7 does not support newer versions of the TLS by default. To activate newer versions of the TLS protocol, user has to specify the system property `https.protocols` and set the value to `TLSv1,TLSv1.1,TLSv1.2`. Consult section on Production Server to find out how to set the system property on particular application server.

### SSL-related Failures on WebLogic 12

Certain graphs using SSL-encrypted connections may fail on WebLogic 12 due to damaged library distributed with this application server. The issue can be identified by a SHA-1 digest error in the graph execution stacktrace:

    ...
    Caused by: java.io.IOException: Could not convert socket to TLS
        at com.sun.mail.pop3.Protocol.stls(Protocol.java:659)
        at com.sun.mail.pop3.POP3Store.getPort(POP3Store.java:269)
        at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:207)
    Caused by: javax.net.ssl.SSLException: java.lang.SecurityException:
        SHA1 digest error for org/bouncycastle/jce/provider/JCEECPublicKey.class
    ...

To fix the issue, replace the library `[MW_HOME]/oracle_common/modules/bcprov-jdk16-1.45.jar` with the one downloaded directly from Bouncy Castle home page. Restart of the application server is required to load the new library.

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