After installing B2B Interior server and B2B Gateway server. When we try to start Gateway Server the following error is seen in the debug enabled Gateway Server log file:

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RuntimeBootsrtap:sInit The Unlimited-Strength JCE Jurisdiction Policy Files have not been installed. Please refer to the User Manual for instructions on installing the required files or you may configure the server not to require these files. Note that in this case, strong encryption algorithms will not be available.
[2017-03-07 09:22:56,859(DEBUG)] Exception occured during runtime initialization: The Unlimited-Strength JCE Jurisdiction Policy Files have not been installed. Please refer to the User Manual for instructions on installing the required files or you may configure the server not to require these files. Note that in this case, strong encryption algorithms will not be available.
[2017-03-07 09:22:56,859(ERROR)] com.tibco.ax.fw.runtime.impl.GtwyRuntimeException: The Unlimited-Strength JCE Jurisdiction Policy Files have not been installed. Please refer to the User Manual for instructions on installing the required files or you may configure the server not to require these files. Note that in this case, strong encryption algorithms will not be available.
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While staring BusinessConnect's Gateway Server, JCE-related error occurs in the Gateway Server log file.

All.

The error is due to missing or incorrect Unlimited Strength JCE (Java Cryptology Extensions) Policy files under TIBCO_HOME\tibcojre64\version\lib\security directory.

Resolution:

1. Go to "http://www.oracle.com/technetwork/java/javase/downloads/index.html" and download the Unlimited Strength JCE Policy files (for BC 6.2.x download jce_policy-7.zip for BC 6.3.x download jce_policy-8.zip file).
2. Unzip it and place the files US_export_policy.jar and local_policy.jar into the TIBCO_HOME\tibcojre64\version\lib\security directory. 
3. Restart Hawk client and Administrator and retest.

http://www.oracle.com/technetwork/java/javase/downloads/index.html