I have about 30 ASA 5505 firewalls. I am using them to remotely connect to my Allen Bradley PLCs. I use ports 2222 and 44818 to connect to the PLC's from different devices. The problem I am having is that sometimes one of the ports will stop responding. More often than not it is the 44818. To remedy the issue, I remotely connect to the firewall and perform and immediate system reload. After the firewall comes back up, everything works normally.
There is no definite time period that this problem occurs and it does not occur equally across all of the firewalls.
Is this a known issue or is there some sort of resolution?