help,everytime i login and run the netstat -an|grep 21

[utnubudnai]

root&root~$ netstat -an|grep 21
unix 2 [ ACC ] STREAM LISTENING 17215 /tmp/orbit-root/linc-14c4-0-24593c7634208
unix 2 [ ACC ] STREAM LISTENING 17560 /tmp/orbit-root/linc-14f5-0-70d211bb3e8d5
unix 2 [ ACC ] STREAM LISTENING 16921 /tmp/scim-panel-socket:0-root
unix 11 [ ] DGRAM 14219 /dev/log
unix 3 [ ] STREAM CONNECTED 17599 /tmp/orbitlinc-14f5-0-70d211bb3e8d5
unix 3 [ ] STREAM CONNECTED 17567 /tmp/orbit-root/linc-14f5-0-70d211bb3e8d5
unix 3 [ ] STREAM CONNECTED 17563 /tmp/orbit-root/linc-14f5-0-70d211bb3e8d5
unix 3 [ ] STREAM CONNECTED 17219
unix 3 [ ] STREAM CONNECTED 17218 /tmp/orbit-root/linc-14c4-0-24593c7634208
unix 3 [ ] STREAM CONNECTED 17217
unix 3 [ ] STREAM CONNECTED 17214 /tmp/orbit-root/linc-149a-0-71037beea8777
unix 3 [ ] STREAM CONNECTED 17213
unix 3 [ ] STREAM CONNECTED 17211 /tmp/.ICE-unix/5224
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Why there are so much things at my port 21?Any ideas?

[xhy]

netstat -an|grep :21

not

netstat -an|grep 21

[utnubudnai]

thanks