Receive an error "KRB_ERR_RESPONSE_TOO_BIG" at await client.Authenticate(credential);

Hello!

I am writing DelegatingHandler for HttpClient to get Kerberos ticket and put it to www-authenticate header. And I’ve got some problems. When I request Kerberos ticket I get Exception

               using (var client = new KerberosClient(Krb5Config.Default()))
                {
                    var keyTable = new KeyTable(
                        _webEnv.ContentRootFileProvider.GetFileInfo(
                            "<keytab file name>").CreateReadStream());

                    var credential = 
                        new KeytabCredential("<account name>", 
                                keyTable, "<domain name>");
                    client.Configuration.Realms["<domain name>"].Kdc.Add("<server name>:88");

                    client.Configuration.Defaults.DefaultRealm = "<domain name>";
                    client.Configuration.DomainRealm.Add("<domain name>", "<domain name>");
                    client.Configuration.Defaults.DnsLookupKdc = false;

                    await client.Authenticate(credential); //exception occurs here
                    KrbApReq ticket = await client.GetServiceTicket("<spn name>");
                    wwwAuthValueAuth 
                        = Negotiate + Convert.ToBase64String(ticket.EncodeGssApi().Span);
                }

                request.Headers.Add(HeaderNames.WWWAuthenticate, wwwAuthValueAuth);

Exception StackTrace:

System.AggregateException: One or more errors occurred. (Cannot locate SRV record for RAIFFEISEN.RU) (KRB_ERR_RESPONSE_TOO_BIG: Response too big for UDP; retry with TCP) (Cannot locate a KDC Proxy endpoint for RAIFFEISEN.RU)
 ---> Kerberos.NET.Transport.KerberosTransportException: Cannot locate SRV record for RAIFFEISEN.RU
   at Kerberos.NET.Transport.KerberosTransportBase.LocatePreferredKdc(String domain, String servicePrefix) in D:\a\1\s\Kerberos.NET\Client\Transport\KerberosTransportBase.cs:line 130
   at Kerberos.NET.Transport.TcpKerberosTransport.GetClient(String domain) in D:\a\1\s\Kerberos.NET\Client\Transport\TcpKerberosTransport.cs:line 77
   at Kerberos.NET.Transport.TcpKerberosTransport.SendMessage[T](String domain, ReadOnlyMemory`1 encoded, CancellationToken cancellation) in D:\a\1\s\Kerberos.NET\Client\Transport\TcpKerberosTransport.cs:line 53
   at Kerberos.NET.Transport.KerberosTransportSelector.SendMessage[T](String domain, ReadOnlyMemory`1 encoded, CancellationToken cancellation)
   --- End of inner exception stack trace ---
   at Kerberos.NET.Transport.KerberosTransportSelector.SendMessage[T](String domain, ReadOnlyMemory`1 encoded, CancellationToken cancellation) in D:\a\1\s\Kerberos.NET\Client\Transport\KerberosTransportSelector.cs:line 86
   at Kerberos.NET.Client.KerberosClient.RequestTgt(KerberosCredential credential) in D:\a\1\s\Kerberos.NET\Client\KerberosClient.cs:line 1009
   at Kerberos.NET.Client.KerberosClient.AuthenticateCredential(KerberosCredential credential) in D:\a\1\s\Kerberos.NET\Client\KerberosClient.cs:line 345
   at Kerberos.NET.Client.KerberosClient.Authenticate(KerberosCredential credential) in D:\a\1\s\Kerberos.NET\Client\KerberosClient.cs:line 328

Could you explain why this happens and how I can resolve it?

Thank you!