We have a Cisco switch in each office and every now and then the port that has the D-Link Wireless AP ( DAP-1522 ) connected to it goes to err-disable state. Actually sometimes even a regular port that has a cisco phone connected may also go to err-disable state (less often). So I have to telnet into the switch and issue shut and no shut command on that interface to get it back to life, then it works for a few days or weeks until it happens again. Can you guys recommend a suitable configuraiton for that interface, that would prevent that from happening or a workaround ? Here's the info: Model: cisco WS-C3560-24PS and cisco WS-C3560-48PS Image:c3560-ipbase-mz.122-35.SE5.bin This is the log from one switch: 31w5d: %PM-4-ERR_DISABLE: psecure-violation error detected on Fa0/2, putting Fa0/2 in err-disable state 31w5d: %PORT_SECURITY-2-PSECURE_VIOLATION: Security violation occurred, caused by MAC address 74e2.f592.f7f2 on port FastEthernet0/2. 31w5d: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed  state to down And from another, which is almost the same: 5d10h: %PM-4-ERR_DISABLE: psecure-violation error detected on Fa0/3, putting Fa0/3 in err-disable state 5d10h: %PORT_SECURITY-2-PSECURE_VIOLATION: Security violation occurred, caused by MAC address d8a2.5e31.2cf6 on port FastEthernet0/3. 5d10h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed state to down 5d10h: %LINK-3-UPDOWN: Interface FastEthernet0/3, changed state to down Here's the configuration of fe interfaces (they are all alike): interface FastEthernet0/2 description Voice & Data Combo Port switchport access vlan 11 switchport mode access switchport voice vlan 15 switchport port-security maximum 4 switchport port-security maximum 3 vlan access switchport port-security maximum 1 vlan voice switchport port-security switchport port-security aging time 1 srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape  10  0  0  0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone spanning-tree portfast I'd appriciate any help. Thank you! ... View more