NIS mainnet node error

last day,I run the mainnet node,and it sync the chain height.but today I check the height ,it not increase yet, means it can’t catch up the chain height.I check the output ,there are just some WARNNING.like this:
2019-11-06 01:36:50.633 WARNING forcibly aborting request to http://108.61.168.86:7890/chain/height (org.nem.core.connect.HttpMethodClient lambda$sendRequest$2)
2019-11-06 01:36:50.633 WARNING forcibly aborting request to http://62.75.251.134:7890/chain/height (org.nem.core.connect.HttpMethodClient lambda$sendRequest$2)

then I check the status,it returns 7,4
curl http://127.0.0.1:7890/status
{“code”:7,“type”:4,“message”:“status”}

how can I solve this problem? please help me…

7 means “NIS local node does not see any remote NIS node”

How much memory you have allocated in start script? Are you runnning with default config.properties?

I have give enough memory to this proc(java -Xms3060M -Xmx3060M).lastday I restart the NIS node and it sync the chain height ,but now it occurs the same problem, log is same as “forcibly aborting request to”, is there other config file needs to modify?

I can ping and telnet those ip that logs say “forcibly aborting request to” successfully, why it occurs this situation?I can’t even find a way to fix this…Sincerely need your help, thanks

Please include some logs from node.
Did you have default settings or did you enabled/disable some features?