Trying to understand Firewall logs

Linux
#1

Feb 19 23:01:57 Server kernel: [87608.028166] [UFW BLOCK] IN= OUT=eth0 SRC=my-ip-address DST=106.39.60.188 LEN=40 TOS=0x00 PREC=0x00 TTL=64 ID=20980 DF PROTO=TCP SPT=443 DPT=2501 WINDOW=35040 RES=0x00 ACK FIN URGP=0

Wonder what is is happening here. from my source to other server 2501 port is accessing. what is 2501. what it is intiated from my servers https port.

#2

Port 2501 is “rtsclient Resource Tracking system client”

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