swift3でError Domain=NSURLErrorDomain

Question

swift3でGoogleアカウント連携を作っています。
コンパイルはできてログイン画面に遷移しますが「Error Domain=NSURLErrorDomain」が発生します。
エラーの詳細は以下となります。
https://play.googleapis.com/logにアクセス時に失敗しているようです。
nscurlでチェックするとTLSv1.2はPASSですがTLSv1.3でエラーとなっています。

どのようにすべきかご意見・アドバイスをお願いします。

2017-12-31 20:05:57.509708+0900 xxx_newi[3068:2186739] NSURLSession/NSURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9802)
2017-12-31 20:05:57.519975+0900 xxx_newi[3068:2185990] <Firebase/Network/ERROR> Encounter network error. Code, error: -1200, Error Domain=NSURLErrorDomain Code=-1200 "An SSL error has occurred and a secure connection to the server cannot be made." UserInfo={NSLocalizedDescription=An SSL error has occurred and a secure connection to the server cannot be made., NSLocalizedRecoverySuggestion=Would you like to connect to the server anyway?, _kCFStreamErrorCodeKey=-9802, NSErrorFailingURLStringKey=https://play.googleapis.com/log, _kCFStreamErrorDomainKey=3, NSUnderlyingError=0x15dae190 {Error Domain=kCFErrorDomainCFNetwork Code=-1200 "(null)" 

nscurl --ats-diagnostics --verbose https://play.googleapis.com/log

Starting ATS Diagnostics

Configuring ATS Info.plist keys and displaying the result of HTTPS loads to https://play.googleapis.com/log.
A test will "PASS" if URLSession:task:didCompleteWithError: returns a nil error.
================================================================================

Default ATS Secure Connection
---
ATS Default Connection
ATS Dictionary:
{
}
Result : PASS
---

================================================================================

Allowing Arbitrary Loads

---
Allow All Loads
ATS Dictionary:
{
    NSAllowsArbitraryLoads = true;
}
Result : PASS
---

================================================================================

Configuring TLS exceptions for play.googleapis.com

---
TLSv1.3
ATS Dictionary:
{
    NSExceptionDomains =     {
        "play.googleapis.com" =         {
            NSExceptionMinimumTLSVersion = "TLSv1.3";
        };
    };
}
2017-12-31 20:11:25.018 nscurl[707:39937] NSURLSession/NSURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9800)
Result : FAIL
Error : Error Domain=NSURLErrorDomain Code=-1200 "An SSL error has occurred and a secure connection to the server cannot be made." UserInfo={_kCFStreamErrorCodeKey=-9800, NSLocalizedRecoverySuggestion=Would you like to connect to the server anyway?, NSUnderlyingError=0x7fe6b9630880 {Error Domain=kCFErrorDomainCFNetwork Code=-1200 "(null)" UserInfo={_kCFStreamPropertySSLClientCertificateState=0, _kCFNetworkCFStreamSSLErrorOriginalValue=-9800, _kCFStreamErrorDomainKey=3, _kCFStreamErrorCodeKey=-9800}}, NSLocalizedDescription=An SSL error has occurred and a secure connection to the server cannot be made., NSErrorFailingURLKey=https://play.googleapis.com/log, NSErrorFailingURLStringKey=https://play.googleapis.com/log, _kCFStreamErrorDomainKey=3}
---
---
TLSv1.2
ATS Dictionary:
{
    NSExceptionDomains =     {
        "play.googleapis.com" =         {
            NSExceptionMinimumTLSVersion = "TLSv1.2";
        };
    };
}
Result : PASS
---

================================================================================

Configuring TLS exceptions with PFS disabled for play.googleapis.com

---
TLSv1.3 with PFS disabled
ATS Dictionary:
{
    NSExceptionDomains =     {
        "play.googleapis.com" =         {
            NSExceptionMinimumTLSVersion = "TLSv1.3";
            NSExceptionRequiresForwardSecrecy = false;
        };
    };
}
2017-12-31 20:11:31.980 nscurl[707:39937] NSURLSession/NSURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9800)
Result : FAIL
Error : Error Domain=NSURLErrorDomain Code=-1200 "An SSL error has occurred and a secure connection to the server cannot be made." UserInfo={_kCFStreamErrorCodeKey=-9800, NSLocalizedRecoverySuggestion=Would you like to connect to the server anyway?, NSUnderlyingError=0x7fe6ba047360 {Error Domain=kCFErrorDomainCFNetwork Code=-1200 "(null)" UserInfo={_kCFStreamPropertySSLClientCertificateState=0, _kCFNetworkCFStreamSSLErrorOriginalValue=-9800, _kCFStreamErrorDomainKey=3, _kCFStreamErrorCodeKey=-9800}}, NSLocalizedDescription=An SSL error has occurred and a secure connection to the server cannot be made., NSErrorFailingURLKey=https://play.googleapis.com/log, NSErrorFailingURLStringKey=https://play.googleapis.com/log, _kCFStreamErrorDomainKey=3}
---


================================================================================

Configuring TLS exceptions with PFS disabled and insecure HTTP allowed for play.googleapis.com

---
TLSv1.3 with PFS disabled and insecure HTTP allowed
ATS Dictionary:
{
    NSExceptionDomains =     {
        "play.googleapis.com" =         {
            NSExceptionAllowsInsecureHTTPLoads = true;
            NSExceptionMinimumTLSVersion = "TLSv1.3";
            NSExceptionRequiresForwardSecrecy = false;
        };
    };
}
2017-12-31 20:11:35.863 nscurl[707:39938] NSURLSession/NSURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9800)
Result : FAIL
Error : Error Domain=NSURLErrorDomain Code=-1200 "An SSL error has occurred and a secure connection to the server cannot be made." UserInfo={_kCFStreamErrorCodeKey=-9800, NSLocalizedRecoverySuggestion=Would you like to connect to the server anyway?, NSUnderlyingError=0x7fe6b94364f0 {Error Domain=kCFErrorDomainCFNetwork Code=-1200 "(null)" UserInfo={_kCFStreamPropertySSLClientCertificateState=0, _kCFNetworkCFStreamSSLErrorOriginalValue=-9800, _kCFStreamErrorDomainKey=3, _kCFStreamErrorCodeKey=-9800}}, NSLocalizedDescription=An SSL error has occurred and a secure connection to the server cannot be made., NSErrorFailingURLKey=https://play.googleapis.com/log, NSErrorFailingURLStringKey=https://play.googleapis.com/log, _kCFStreamErrorDomainKey=3}
---

================================================================================

Answer 1

何が原因かわかりませんが、何度かRunしていると直りました。
何か変更した覚えがありませんので原因はよくわかりませんでしたが再実行時に回復する場合もありそうです。