diff --git a/electrum/network.py b/electrum/network.py
index 030c50c64..b9e7afb9e 100644
--- a/electrum/network.py
+++ b/electrum/network.py
@@ -780,7 +780,7 @@ class Network(PrintError):
             try:
                 return await func(self, *args, **kwargs)
             except aiorpcx.jsonrpc.CodeMessageError as e:
-                raise UntrustedServerReturnedError(original_exception=e)
+                raise UntrustedServerReturnedError(original_exception=e) from e
         return wrapper
 
     @best_effort_reliable
diff --git a/electrum/synchronizer.py b/electrum/synchronizer.py
index cdde6d248..f327669fa 100644
--- a/electrum/synchronizer.py
+++ b/electrum/synchronizer.py
@@ -32,6 +32,7 @@ from aiorpcx import TaskGroup, run_in_thread
 from .transaction import Transaction
 from .util import bh2u, make_aiohttp_session, NetworkJobOnDefaultServer
 from .bitcoin import address_to_scripthash, is_address
+from .network import UntrustedServerReturnedError
 
 if TYPE_CHECKING:
     from .network import Network
@@ -165,7 +166,7 @@ class Synchronizer(SynchronizerBase):
         # Remove request; this allows up_to_date to be True
         self.requested_histories.pop(addr)
 
-    async def _request_missing_txs(self, hist):
+    async def _request_missing_txs(self, hist, *, allow_server_not_finding_tx=False):
         # "hist" is a list of [tx_hash, tx_height] lists
         transaction_hashes = []
         for tx_hash, tx_height in hist:
@@ -179,10 +180,18 @@ class Synchronizer(SynchronizerBase):
         if not transaction_hashes: return
         async with TaskGroup() as group:
             for tx_hash in transaction_hashes:
-                await group.spawn(self._get_transaction, tx_hash)
+                await group.spawn(self._get_transaction(tx_hash, allow_server_not_finding_tx=allow_server_not_finding_tx))
 
-    async def _get_transaction(self, tx_hash):
-        result = await self.network.get_transaction(tx_hash)
+    async def _get_transaction(self, tx_hash, *, allow_server_not_finding_tx=False):
+        try:
+            result = await self.network.get_transaction(tx_hash)
+        except UntrustedServerReturnedError as e:
+            # most likely, "No such mempool or blockchain transaction"
+            if allow_server_not_finding_tx:
+                self.requested_tx.pop(tx_hash)
+                return
+            else:
+                raise
         tx = Transaction(result)
         try:
             tx.deserialize()
@@ -207,7 +216,7 @@ class Synchronizer(SynchronizerBase):
             # Old electrum servers returned ['*'] when all history for the address
             # was pruned. This no longer happens but may remain in old wallets.
             if history == ['*']: continue
-            await self._request_missing_txs(history)
+            await self._request_missing_txs(history, allow_server_not_finding_tx=True)
         # add addresses to bootstrap
         for addr in self.wallet.get_addresses():
             await self._add_address(addr)