"failed Internal error" with pcap transfer from Management Center CLI
Article ID: 406019
Updated On:
Products
Issue/Introduction
Management Center Admin took a pcap capture per Management Center documentation.
When the admin attempts to transfer the resulting pcap via the CLI (before or after stopping the capture), they get an Internal Server error as shown:-
# pcap transfer ftp://10.0.0.1/traces/test.cap username password
% failed Internal error
Also tried FQDN of FTP server without any difference.
The PCAP is valid and can be downloaded via the Management Center UI.
lonsm00002# pcap view
Capture stopped - previous capture details:
Started: 2025-07-28T08:54:22+0000
Stopped: 2025-07-28T08:56:21+0000
Interface: 0:0
Direction: both
Filter: host 10.0.0.1 and port 22
Size limit: 50 MB
Capture size: 924 bytes
The FTP server login works from WinSCP, yet the FTP server never sees any comms from the SMC.
Management Center Proxy configuration enabled pointing to an on-premise proxy server, and without any option to bypass any domains/IP addresses.
Environment
Management Center.
On premise Proxy.
Cause
FTP request was dropped by on premise proxy server.
Resolution
To get the CLI based FTP upload working via the proxy, the following changes needed to be applied:
1. disable auth for any requests from MC host IP address of 10.0.0.2 (see sample CPL below although all can be merged into one statement)
<Proxy>
client.address=10.0.0.2 authenticate(no)
2. disable protocol detection for the MC host IP address
<Proxy>
client.address=10.0.0.2 detect_protocol(no)
3. make sure there is no policy blocking access from this IP address
<Proxy>
client.address=10.0.0.2 allow
4. make sure there is no block for non standard TCP ports !
;url.port=!(80, 8080, 443, 8443) force_deny.request("Block all non standard Web ports")
Additional Information
Management center debug logs do not provide much details on reason for error,
Troubleshooting from the Proxy server provided more details.
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