Unable to communicate with RSA server using SDK

Hi ,

We have developed one web based application by using  RSA SDK 8.6 .

some times we are unable to communicate with the RSA server. 

We are getting return code 402 for SD_Init() and 102 for SD_Check()

Could you please explain when exactly this code will occurs. 

Below are the logs .

017-01-16 11:48:09.246 0.40.8340 [V] verbose .\SD_API.cpp 665 Leaving SD_Check()

2017-01-16 11:50:11.770 0.40.5340 [V] verbose .\SD_API.cpp 593 Leaving _SD_InitEx()

2017-01-16 11:50:11.770 0.40.5340 [E] error .\SD_API.cpp 646

                                       Factory NULL