Trying to understand Firewall logs

Feb 19 23:01:57 Server kernel: [87608.028166] [UFW BLOCK] IN= OUT=eth0 SRC=my-ip-address DST= 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.

Port 2501 is “rtsclient Resource Tracking system client”

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