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After the upgrade, port forwarding (FTP) is not available

Publication Date:  2012-09-26 Views:  132 Downloads:  0
Issue Description
There is a virtual gateway only opened up port forwarding (21 FTP service provided), in which some clients can login to this virtual gateway successfully, and can successfully turn on port forwarding function, but you cannot use IE to access FTP resources. And the SVN3000 upgrade to the latest version, everything works before upgrade.
Alarm Information
none
Handling Process
1. Observe phenomena in administrator host. Check the version of SVN3000 plug-in (the default path: C: \ Windows \ System32 \ portforward) is the latest version. Check the client log information (% appdata % _svnclient _log). Find the client bottom plug-in not actual update by the analysis, providing the following solutions:
In the cmd: netsh winsock reset (reload client plug-in), according to the system prompts system prompts, restart operate. Problem solved.
2. After that, to deal with the terminal problem business department, according to the same way, the fault cannot be solved. Then check the client end LOG and analysis, but without any unusual problem. Then, download FTP client software, and testing, FTP function is able to use. So positioning that business department terminal IE6.0 (FTP passive mode) and SVN3000 (V100R002C02SPC800) version compatibility has problems.
Sum up the above;
Because part of the client appear unable to use IE access to FTP resources, so the preliminary positioning is the client plug-in don’t update or bottom winsock no update. After the discovery service department, according to method 1 treatment, problems still exist. After use FTP client software access, everything is normal.
Advice: if start port forwarding function, and is dynamic port services (such as FTP passive mode). Advise use the client software if no special demand.
Root Cause
1, part of the client plug-in do not upgrade to the latest version.
2, the compatibility issues between IE6.0 (FTP mode) and SVN3000 (V100R002C02SPC800) version.
Suggestions
According to the same phenomenon but different fault reason, analysis different log information and provide different solutions.

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