topic Network - Security in Network Security

Network - Security

ITCompMinco — Thu, 02 Apr 2026 06:12:40 GMT

Dear Support,

I would like to configure Cisco Firewall 5525 to allow traffic from Rusk desk Remote Desktop from external network (outside company domain). The current configuration are as below:

a. Service Objects/Groups - Add port 21115 to 21119.
b. Network Objects/Groups - Add the Server IP address and map it to legacy Ip.
c. Add NAT rules and access rules.

But, the scenario now is if i try to connect from my company laptop which connected to external Wi-Fi to my company desktop. The software display Connection Error-ID does not exist.

Re: Network - Security

ahollifield — Mon, 06 Apr 2026 19:10:40 GMT

https://www.cisco.com/c/en/us/products/collateral/security/asa-firepower-services/eos-eol-notice-c51-743545.html

Re: Network - Security

ITCompMinco — Mon, 11 May 2026 09:29:16 GMT

Thanks..I have solve the issue.

Re: Network - Security

ITCompMinco — Mon, 11 May 2026 10:09:23 GMT

But, now i have another issue during setup the Site to Site VPN. I get this error. Please advise:

[ERROR] crypto ikev2 enable outside Failed to open "udp/localized/3/500" ERROR: Error opening IKE port 500 on Interface outside

Re: Network - Security

Rob Ingram — Mon, 11 May 2026 10:16:41 GMT

@ITCompMinco I would recommend starting a new thread as this is unrelated to the original post. In the new post provide more information such as configuration...but at a guess you may have a NAT rule translating udp/500 to the outside interface.