There could be some metadata inconsistency with this tables which might causing the exception.
Can you please share the stack trace of the error.
Try validating the ORS and check if you are getting any error there.
SocketException will occur for many reasons. It may related to your environment, Meta data,etc. Please verify the cmxserver logs and application server logs to get more detailed error messages. If possible please share the details from logs. It helps.
If possible please share the complete error stack from cmxsevrer and application server logs.