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Here is description of error 2999:-
Status Code : 2999
Name : TCP/IP packet buffers (DCU's) exhausted
Description : The TCP/IP stack has no free packet buffers (DCUs) available. Communications services using TCP/IP may be disrupted.
Status Code : 2999
Name : TCP/IP packet buffers (DCU's) exhausted
Description : The TCP/IP stack has no free packet buffers (DCUs) available. Communications services using TCP/IP may be disrupted.