UnityTls Error 7 / SSL Handshake Failure on openSUSE Tumbleweed

[pickle780]

Description

After a system update or snapper rollback, some Unity / Battle.net games may fail to connect to servers.

This has been observed primarily on openSUSE Tumbleweed.

The failure is most likely caused by an incompatible Mono TLS provider after system changes, rather than missing certificates.

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Symptoms

Game launches normally but cannot connect to Battle.net servers.

Check the log:

~/.config/unity3d/Blizzard Entertainment/Hearthstone/Player.log

Typical errors:

Curl error 35: Cert handshake failed
UnityTls error code: 7
Chain instance is empty
Curl error 42: Callback aborted

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When This Happens

Common triggers:

• System upgrade (zypper dup)
• snapper rollback
• Restoring an old snapshot
• OpenSSL / libcurl / Mono upgrade
• Rolling-release distribution updates

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Root Cause (Most Likely)

The default Mono TLS provider becomes incompatible with the updated system libraries.

In rolling distributions, system components may change faster than the runtime environment.

Result:

TLS handshake fails even though certificates exist

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Quick Fix (Try This First)

export MONO_TLS_PROVIDER=btls
./Bin/Hearthstone

If the game connects successfully after this change, the issue is confirmed.

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Why This Works

btls uses an internal TLS implementation bundled with Mono.

It does not rely on the system OpenSSL stack.

This avoids compatibility problems after system upgrades or rollback.

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If That Does Not Work

Try synchronizing the Mono certificate store.

sudo TERM=vt100 cert-sync /etc/ssl/ca-bundle.pem

This fixes cases where the Mono trust store is missing or out of sync.

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Recommended Launch Script

#!/bin/bash

# Clear proxy variables
unset http_proxy https_proxy all_proxy
unset HTTP_PROXY HTTPS_PROXY ALL_PROXY

export no_proxy="*"

# Explicit certificate paths
export SSL_CERT_FILE=/etc/ssl/ca-bundle.pem
export SSL_CERT_DIR=/etc/ssl/certs

# Force modern TLS provider
export MONO_TLS_PROVIDER=btls

./Bin/Hearthstone

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Verification

Run:

MONO_TLS_PROVIDER=btls mono --version

Expected output includes:

TLS:           btls

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One-Line Summary

export MONO_TLS_PROVIDER=btls

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Notes

• This issue is environment-specific.
• It may not affect all Linux distributions.
• Rolling-release systems are more likely to encounter it.

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[pickle780]

描述

在系统更新或执行 snapper rollback 后，一些 Unity / Battle.net 游戏可能无法连接到服务器。

此问题主要发生在 openSUSE Tumbleweed。

失败的原因 很可能是系统更改后 Mono TLS 提供程序不兼容，而非证书缺失。

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症状

游戏可以正常启动，但无法连接到 Battle.net 服务器。

检查日志：

~/.config/unity3d/Blizzard Entertainment/Hearthstone/Player.log

典型错误：

Curl error 35: Cert handshake failed
UnityTls error code: 7
Chain instance is empty
Curl error 42: Callback aborted

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触发场景

常见触发因素：

• 系统升级 (zypper dup)
• snapper rollback
• 恢复旧的系统快照
• OpenSSL / libcurl / Mono 升级
• 滚动更新的发行版

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根本原因（最可能）

默认的 Mono TLS 提供程序与更新后的系统库不兼容。

在滚动更新的发行版中，系统组件的更新速度可能快于运行时环境。

结果：

即使证书存在，TLS 握手也会失败

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快速修复（优先尝试）

export MONO_TLS_PROVIDER=btls
./Bin/Hearthstone

如果游戏在此修改后成功连接，则问题得到确认。

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原理说明

btls 使用 Mono 内置的 TLS 实现。

它不依赖系统的 OpenSSL 栈。

这可以避免系统升级或回滚后的兼容性问题。

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如果仍然无效

尝试同步 Mono 证书存储：

sudo TERM=vt100 cert-sync /etc/ssl/ca-bundle.pem

此方法可修复 Mono 信任存储缺失或不同步的情况。

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推荐启动脚本

#!/bin/bash

# 清除代理变量
unset http_proxy https_proxy all_proxy
unset HTTP_PROXY HTTPS_PROXY ALL_PROXY

export no_proxy="*"

# 明确证书路径
export SSL_CERT_FILE=/etc/ssl/ca-bundle.pem
export SSL_CERT_DIR=/etc/ssl/certs

# 强制使用现代 TLS 提供程序
export MONO_TLS_PROVIDER=btls

./Bin/Hearthstone

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验证

运行：

MONO_TLS_PROVIDER=btls mono --version

期望输出包含：

TLS:           btls

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一行总结

export MONO_TLS_PROVIDER=btls

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注意事项

• 此问题与环境相关。
• 并非所有 Linux 发行版都会受影响。
• 滚动更新系统更容易遇到此问题。

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