FtpWebRequest method "ListDirectoryDetails" returns broken result for encrypted connetion

Description

This is a regression in .NET10: I use FtpWebRequest with Method = WebRequestMethods.Ftp.ListDirectoryDetails to return a directory listing.

I read the response like this:

FtpWebResponse response = (FtpWebResponse)webRequest.GetResponse();
using StreamReader reader = new StreamReader(response.GetResponseStream());
string response = reader.ReadToEnd();

With .NET9, this returns this:

07-08-24  11:04AM       <DIR>          subdir1
04-29-22  10:55AM       <DIR>          subdir2
04-29-22  10:54AM                12037 file1.png
07-01-22  01:31PM             10981859 file2.xml

.NET 10 returns some garbage - I post a screenshot of the string content from debugger:

Reproduction Steps

Attached is a sample: FtpTest.zip

It contains two target frameworks ("net9.0-windows" and "net10.0-windows"), so launch it with both to compare the results.

In the sample, enter FTP server address, login and password and set the checkbox "Encrypt connetion".

Then click "Directory listing".
This should work with .NET9, but show a broken response with .NET10.

Expected behavior

.NET10 should report a plain text listing identical to .NET9.

Actual behavior

See description.

Regression?

.NET9.

Known Workarounds

Use FluentFtp - my sample also provides this.

Configuration

No response

Other information

No response

@karelz

Tagging subscribers to this area: @karelz, @dotnet/ncl
See info in area-owners.md if you want to be subscribed.

I'm a bot. Here is a possible related and/or duplicate issue (I may be wrong):

.NET10 FtpWebRequest - Breaking Change - EnableSsl=true leads to encoded output sdk#52324

The bot is right, dotnet/sdk#52324 is the same issue. But I will keep this one open, as I think the "runtime" repo is the proper place to report this.

I found another issue about regressions in .NET 10 FTP upload, where the broken output is mentioned in comment #123135 (comment). Part of issue #123135 seems to have been fixed in .NET11: #123234, but this fix probably does not handle the broken output.

@WolfgangHG

I tried to reproduce it @WolfgangHG and not seems like #123234 resolves it as well. please give it shot with .NET 11 RC1+ and share the outcome.

This issue has been marked needs-author-action and may be missing some important information.

Add FTPS directory listing regression test (#135077)

I can confirm that it works in .NET11 RC1: both the broken result string and the random ObjectDisposedException are fixed.

Closing this issue. A backport to .NET10 would be nice, but we already worked around it by adding FluentFtp support.

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FtpWebRequest method "ListDirectoryDetails" returns broken result for encrypted connetion #134130

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Actual behavior

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FtpWebRequest method "ListDirectoryDetails" returns broken result for encrypted connetion #134130

Description

Description

Reproduction Steps

Expected behavior

Actual behavior

Regression?

Known Workarounds

Configuration

Other information

Activity

dotnet-policy-service commented on Sep 17, 2026

MihuBot commented on Sep 17, 2026

WolfgangHG commented on Sep 17, 2026

wfurt commented on Oct 2, 2026

dotnet-policy-service commented on Oct 2, 2026

WolfgangHG commented on Oct 3, 2026

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