diff --git a/impacket/krb5/kerberosv5.py b/impacket/krb5/kerberosv5.py
index d81af85904..4a8173f308 100644
--- a/impacket/krb5/kerberosv5.py
+++ b/impacket/krb5/kerberosv5.py
@@ -92,7 +92,7 @@ def sendReceive(data, host, kdcHost, port=88):
 
     return r
 
-def getKerberosTGT(clientName, password, domain, lmhash, nthash, aesKey='', kdcHost=None, requestPAC=True, serverName=None, kerberoast_no_preauth=False):
+def getKerberosTGT(clientName, password, domain, lmhash, nthash, aesKey='', kdcHost=None, requestPAC=True, serverName=None):
 
     # Convert to binary form, just in case we're receiving strings
     if isinstance(lmhash, str):
@@ -119,11 +119,8 @@ def getKerberosTGT(clientName, password, domain, lmhash, nthash, aesKey='', kdcH
     asReq = AS_REQ()
 
     domain = domain.upper()
-
     if serverName is None:
         serverName = Principal('krbtgt/%s'%domain, type=constants.PrincipalNameType.NT_PRINCIPAL.value)
-    else:
-        serverName = Principal(serverName, type=constants.PrincipalNameType.NT_PRINCIPAL.value)
 
     pacRequest = KERB_PA_PAC_REQUEST()
     pacRequest['include-pac'] = requestPAC
@@ -193,10 +190,10 @@ def getKerberosTGT(clientName, password, domain, lmhash, nthash, aesKey='', kdcH
                 seq_set_iter(reqBody, 'etype', supportedCiphers)
                 message = encoder.encode(asReq)
                 r = sendReceive(message, domain, kdcHost)
-            else:
-                raise
+            else: 
+                raise 
         else:
-            raise
+            raise 
 
     # This should be the PREAUTH_FAILED packet or the actual TGT if the target principal has the
     # 'Do not require Kerberos preauthentication' set
@@ -348,11 +345,7 @@ def getKerberosTGT(clientName, password, domain, lmhash, nthash, aesKey='', kdcH
         # probably bad password if preauth is disabled
         if preAuth is False:
             error_msg = "failed to decrypt session key: %s" % str(e)
-            if kerberoast_no_preauth:
-                LOG.debug(SessionKeyDecryptionError(error_msg, asRep, cipher, key, cipherText))
-                return tgt, None, key, None
-            else:
-                raise SessionKeyDecryptionError(error_msg, asRep, cipher, key, cipherText)
+            raise SessionKeyDecryptionError(error_msg, asRep, cipher, key, cipherText)
         raise
     encASRepPart = decoder.decode(plainText, asn1Spec = EncASRepPart())[0]
 
@@ -574,10 +567,10 @@ def getKerberosType1(username, password, domain, lmhash, nthash, aesKey='', TGT
                             from impacket.ntlm import compute_lmhash, compute_nthash
                             LOG.debug('Got KDC_ERR_ETYPE_NOSUPP, fallback to RC4')
                             lmhash = compute_lmhash(password)
-                            nthash = compute_nthash(password)
+                            nthash = compute_nthash(password) 
                             continue
                         else:
-                            raise
+                            raise 
                     else:
                         raise
 
@@ -601,22 +594,22 @@ def getKerberosType1(username, password, domain, lmhash, nthash, aesKey='', TGT
                         from impacket.ntlm import compute_lmhash, compute_nthash
                         LOG.debug('Got KDC_ERR_ETYPE_NOSUPP, fallback to RC4')
                         lmhash = compute_lmhash(password)
-                        nthash = compute_nthash(password)
+                        nthash = compute_nthash(password) 
                     else:
-                        raise
+                        raise 
                 else:
-                    raise
+                    raise 
             else:
                 break
         else:
             tgs = TGS['KDC_REP']
             cipher = TGS['cipher']
-            sessionKey = TGS['sessionKey']
+            sessionKey = TGS['sessionKey'] 
             break
 
     # Let's build a NegTokenInit with a Kerberos REQ_AP
 
-    blob = SPNEGO_NegTokenInit()
+    blob = SPNEGO_NegTokenInit() 
 
     # Kerberos
     blob['MechTypes'] = [TypesMech['MS KRB5 - Microsoft Kerberos 5']]
@@ -625,7 +618,7 @@ def getKerberosType1(username, password, domain, lmhash, nthash, aesKey='', TGT
     tgs = decoder.decode(tgs, asn1Spec = TGS_REP())[0]
     ticket = Ticket()
     ticket.from_asn1(tgs['ticket'])
-
+    
     # Now let's build the AP_REQ
     apReq = AP_REQ()
     apReq['pvno'] = 5
@@ -645,7 +638,7 @@ def getKerberosType1(username, password, domain, lmhash, nthash, aesKey='', TGT
     authenticator['cusec'] = now.microsecond
     authenticator['ctime'] = KerberosTime.to_asn1(now)
 
-
+    
     authenticator['cksum'] = noValue
     authenticator['cksum']['cksumtype'] = 0x8003
 
@@ -704,7 +697,7 @@ def __init__( self, error = 0, packet=0):
         self.packet = packet
         if packet != 0:
             self.error = self.packet['error-code']
-
+       
     def getErrorCode( self ):
         return self.error
 
@@ -712,7 +705,7 @@ def getErrorPacket( self ):
         return self.packet
 
     def getErrorString( self ):
-        return str(self)
+        return constants.ERROR_MESSAGES[self.error]
 
     def __str__( self ):
         retString = 'Kerberos SessionError: %s(%s)' % (constants.ERROR_MESSAGES[self.error])
@@ -721,13 +714,7 @@ def __str__( self ):
             if self.error == constants.ErrorCodes.KRB_ERR_GENERIC.value:
                 eData = decoder.decode(self.packet['e-data'], asn1Spec = KERB_ERROR_DATA())[0]
                 nt_error = struct.unpack('<L', eData['data-value'].asOctets()[:4])[0]
-
-                if nt_error in nt_errors.ERROR_MESSAGES:
-                    error_msg_short = nt_errors.ERROR_MESSAGES[nt_error][0] 
-                    error_msg_verbose = nt_errors.ERROR_MESSAGES[nt_error][1] 
-                    retString += '\nNT ERROR: code: 0x%x - %s - %s' % (nt_error, error_msg_short, error_msg_verbose)
-                else:
-                    retString += '\nNT ERROR: unknown error code: 0x%x' % nt_error
+                retString += '\nNT ERROR: %s(%s)' % (nt_errors.ERROR_MESSAGES[nt_error])
         except:
             pass
 
diff --git a/impacket/smbconnection.py b/impacket/smbconnection.py
index 58c1e51b27..0e09ddb6c8 100644
--- a/impacket/smbconnection.py
+++ b/impacket/smbconnection.py
@@ -986,7 +986,7 @@ def getErrorPacket( self ):
         return self.packet
 
     def getErrorString( self ):
-        return str(self)
+        return constants.ERROR_MESSAGES[self.error]
 
     def __str__( self ):
         key = self.error