I have an issue with a Cisco Catalyst 3550 and some Cisco Catalyst 2950.
I have a DMZ station behind an ASA 5510 which I am telnetting the switches.
Sometimes I get telnet access, sometimes it does not work. I can ping the latter and get snmp data to these switches, its just the telnet is on and off.
I can access normally other switches 2960 and 3560G without any problem.
The switches are also synchronised in ntp with the dmz station.
Outside the DMZ, in the LAN, i can access by telnet without problem.
I can also connect with those switches via the 2960 and 3560G by telnetting in privilege mode.
In the ASA, it can only see SYN timeout.
The IOS version is 12.1(22)ea4
There is no routing issue.
The 3550 is configuring with multiple VLAN, ip routing.