Socket Exhaustion when accessing CRM web services

When submitting a large number requests to the CrmService web service, you may occasionally get the error 'Only one usage of each socket address (protocol/network address/port) is normally permitted'. The reason for this is 'socket exhaustion', which is excellently described here. You are at risk of this happening when over 4000 web requests are submitted within 4 minutes - I find this most commonly on data imports, but have recently met it during heavy user activity on a live CRM system.

There are 2 solutions:

1. As suggested in the link above, add registry values to give a much wider range of socket addresses. Note that you need to restart the server for these registry changes to take effect
2. Set the UnsafeAuthenticatedConnectionSharing and PreAuthenticate properties of your CrmService (or MetadateService) proxy to true. This will allow your web request to reuse the same socket